2A652 (Age Journeyman) Volume 3, Edit Code 6

1. (401) When a motor continues turning after reaching its limit, this is known as

Inertia.

Impedance.

Inductance.

Eddy currents.

When a motor continues turning after reaching its limit, it is due to inertia. Inertia is the tendency of an object to resist changes in its state of motion. In this case, the motor's inertia causes it to keep turning even after it has reached its limit, as it takes time for the motor to slow down and come to a stop.

Explanation

When a motor continues turning after reaching its limit, it is due to inertia. Inertia is the tendency of an object to resist changes in its state of motion. In this case, the motor's inertia causes it to keep turning even after it has reached its limit, as it takes time for the motor to slow down and come to a stop.

2. (423) Common or frequently occurring troubles in a unit, their cause, and remedies may be found in the

Historical record.

Maintenance record.

Troubleshooting chart.

Illustrated parts breakdown.

A troubleshooting chart is a tool that provides a systematic approach to identify and resolve common or frequently occurring troubles in a unit. It contains a list of potential problems, their causes, and recommended remedies. By referring to the troubleshooting chart, technicians can quickly diagnose and fix issues, saving time and effort. The historical record and maintenance record may contain information about past problems and their solutions, but they may not provide a structured and organized approach like a troubleshooting chart does. The illustrated parts breakdown, on the other hand, is a visual representation of the unit's components and may not include troubleshooting information.

Explanation

A troubleshooting chart is a tool that provides a systematic approach to identify and resolve common or frequently occurring troubles in a unit. It contains a list of potential problems, their causes, and recommended remedies. By referring to the troubleshooting chart, technicians can quickly diagnose and fix issues, saving time and effort. The historical record and maintenance record may contain information about past problems and their solutions, but they may not provide a structured and organized approach like a troubleshooting chart does. The illustrated parts breakdown, on the other hand, is a visual representation of the unit's components and may not include troubleshooting information.

3. (407) The first thing you should do when troubleshooting a motor is perform a

Voltage check.

Continuity test.

Visual inspection.

Current measurement.

When troubleshooting a motor, the first thing you should do is perform a visual inspection. This involves visually inspecting the motor for any obvious signs of damage, such as loose connections, burnt wires, or broken parts. By conducting a visual inspection, you can identify any visible issues that may be causing the problem with the motor. This step is important because it allows you to quickly identify and address any visible problems before moving on to more complex diagnostic tests.

Explanation

When troubleshooting a motor, the first thing you should do is perform a visual inspection. This involves visually inspecting the motor for any obvious signs of damage, such as loose connections, burnt wires, or broken parts. By conducting a visual inspection, you can identify any visible issues that may be causing the problem with the motor. This step is important because it allows you to quickly identify and address any visible problems before moving on to more complex diagnostic tests.

4. (413) The maintenance procedure that is considered to be the cheapest and most effective means of reducing injection equipment problems and maintenance costs is

Correct defective components only.

Rigid maintenance schedules.

Periodic overhaul schedule.

Preventive maintenance.

Preventive maintenance is the most cost-effective procedure for reducing injection equipment problems and maintenance costs. It involves regularly inspecting and servicing equipment to prevent breakdowns and identify potential issues before they become major problems. By conducting routine maintenance, such as cleaning, lubricating, and replacing worn parts, the chances of equipment failure are significantly reduced. This proactive approach helps extend the lifespan of the equipment, improves its performance, and minimizes the need for costly repairs or component replacements.

Explanation

Preventive maintenance is the most cost-effective procedure for reducing injection equipment problems and maintenance costs. It involves regularly inspecting and servicing equipment to prevent breakdowns and identify potential issues before they become major problems. By conducting routine maintenance, such as cleaning, lubricating, and replacing worn parts, the chances of equipment failure are significantly reduced. This proactive approach helps extend the lifespan of the equipment, improves its performance, and minimizes the need for costly repairs or component replacements.

5. (414) The first thing you should do when operating a diesel engine is to

Retorque the engine-mount bolts.

Drain moisture from fuel system.

Perform a preoperational check.

Perform a periodic inspection.

When operating a diesel engine, it is important to perform a preoperational check. This involves checking various components of the engine to ensure they are in proper working condition before starting the engine. This helps to identify any potential issues or malfunctions that could affect the engine's performance or safety. Retorquing the engine-mount bolts, draining moisture from the fuel system, and performing a periodic inspection are also important maintenance tasks for a diesel engine, but they are not the first thing that should be done when operating the engine.

Explanation

When operating a diesel engine, it is important to perform a preoperational check. This involves checking various components of the engine to ensure they are in proper working condition before starting the engine. This helps to identify any potential issues or malfunctions that could affect the engine's performance or safety. Retorquing the engine-mount bolts, draining moisture from the fuel system, and performing a periodic inspection are also important maintenance tasks for a diesel engine, but they are not the first thing that should be done when operating the engine.

6. (402) Torque is defined as

Wattage.

Horsepower.

Rotational force.

Opposition to applied voltage.

Torque is defined as rotational force. It is the measure of the force that can cause an object to rotate around an axis. Torque is dependent on both the force applied and the distance from the axis of rotation. It is commonly used in physics and engineering to describe the turning or twisting force applied to an object. Wattage and horsepower are units used to measure power, while opposition to applied voltage refers to resistance.

Explanation

Torque is defined as rotational force. It is the measure of the force that can cause an object to rotate around an axis. Torque is dependent on both the force applied and the distance from the axis of rotation. It is commonly used in physics and engineering to describe the turning or twisting force applied to an object. Wattage and horsepower are units used to measure power, while opposition to applied voltage refers to resistance.

7. (420) If the gas turbine compressor (GTC) load control butterfly valve opens too slowly or too quickly, what is the most probable cause of the malfunction?

Excessive exhaust gas temperature.

Maladjusted rate adjustment screw.

Ruptured actuator diaphragm.

Defective relief valve.

If the gas turbine compressor (GTC) load control butterfly valve opens too slowly or too quickly, the most probable cause of the malfunction is a maladjusted rate adjustment screw. This screw controls the rate at which the valve opens and closes, so if it is not properly adjusted, it can result in the valve opening too slowly or too quickly. This can lead to inefficiencies in the turbine's operation and affect its performance.

Explanation

If the gas turbine compressor (GTC) load control butterfly valve opens too slowly or too quickly, the most probable cause of the malfunction is a maladjusted rate adjustment screw. This screw controls the rate at which the valve opens and closes, so if it is not properly adjusted, it can result in the valve opening too slowly or too quickly. This can lead to inefficiencies in the turbine's operation and affect its performance.

8. (442) Before the A/M32A–60A generator set is started, the operator must perform

Only minor repairs.

Any needed repairs.

A periodic inspection.

An operation inspection.

Before the A/M32A-60A generator set is started, the operator must perform an operation inspection. This means that the operator needs to inspect the generator set to ensure that it is in proper working condition and ready to be operated. This inspection may include checking for any visible damage, leaks, or loose connections, as well as ensuring that all necessary components are in place and functioning correctly. By performing an operation inspection, the operator can identify and address any potential issues or malfunctions before starting the generator set, ensuring safe and efficient operation.

Explanation

Before the A/M32A-60A generator set is started, the operator must perform an operation inspection. This means that the operator needs to inspect the generator set to ensure that it is in proper working condition and ready to be operated. This inspection may include checking for any visible damage, leaks, or loose connections, as well as ensuring that all necessary components are in place and functioning correctly. By performing an operation inspection, the operator can identify and address any potential issues or malfunctions before starting the generator set, ensuring safe and efficient operation.

9. (413) The filtration step protects the diesel engine fuel system from

Blockage of airflow.

Lube system malfunctions.

Slipping belts on the blower.

Abrasion by foreign particles.

The filtration step in the diesel engine fuel system is designed to protect the system from abrasion caused by foreign particles. These particles can enter the fuel system and cause damage to the engine components if not filtered out. By removing these particles, the filtration step ensures that the fuel flowing through the system is clean and free from any abrasive contaminants that could potentially cause blockage or damage. This helps to maintain the efficiency and longevity of the fuel system and prevents any potential malfunctions or failures.

Explanation

The filtration step in the diesel engine fuel system is designed to protect the system from abrasion caused by foreign particles. These particles can enter the fuel system and cause damage to the engine components if not filtered out. By removing these particles, the filtration step ensures that the fuel flowing through the system is clean and free from any abrasive contaminants that could potentially cause blockage or damage. This helps to maintain the efficiency and longevity of the fuel system and prevents any potential malfunctions or failures.

10. (429) Three different loads can be supported at the same time by a

Direct current (DC) generator.

Single-phase generator.

Two-phase generator.

Three-phase generator.

A three-phase generator is capable of supporting three different loads simultaneously because it generates three separate alternating currents that are 120 degrees out of phase with each other. This allows for a more balanced and efficient distribution of power to the loads, compared to single-phase or two-phase generators which can only support one or two loads respectively.

Explanation

A three-phase generator is capable of supporting three different loads simultaneously because it generates three separate alternating currents that are 120 degrees out of phase with each other. This allows for a more balanced and efficient distribution of power to the loads, compared to single-phase or two-phase generators which can only support one or two loads respectively.

11. (439) On the A/M32A–60A, the short-circuit relay

Connects the batteries together.

Protects the exciter field circuit.

Allows two generators to be paralleled.

Allows for quick warm-up of the batteries.

The short-circuit relay on the A/M32A-60A is responsible for protecting the exciter field circuit. This means that it helps prevent any damage or malfunction in the exciter field circuit by detecting and interrupting any short-circuits that may occur. This is important because the exciter field circuit is a critical component in generating power, and any damage to it could lead to a loss of power or even equipment failure. Therefore, the short-circuit relay plays a crucial role in ensuring the proper functioning and protection of the exciter field circuit.

Explanation

The short-circuit relay on the A/M32A-60A is responsible for protecting the exciter field circuit. This means that it helps prevent any damage or malfunction in the exciter field circuit by detecting and interrupting any short-circuits that may occur. This is important because the exciter field circuit is a critical component in generating power, and any damage to it could lead to a loss of power or even equipment failure. Therefore, the short-circuit relay plays a crucial role in ensuring the proper functioning and protection of the exciter field circuit.

12. (430) What provides power for operating the load bank control circuits?

Unit under test (UUT).

Load bank generators.

External batteries.

Facility power.

The correct answer is "Unit under test (UUT)". The unit under test refers to the equipment or system being tested. In this context, it means that the power for operating the load bank control circuits is provided by the unit under test itself. This implies that the load bank control circuits are connected to the UUT and draw power from it to operate.

Explanation

The correct answer is "Unit under test (UUT)". The unit under test refers to the equipment or system being tested. In this context, it means that the power for operating the load bank control circuits is provided by the unit under test itself. This implies that the load bank control circuits are connected to the UUT and draw power from it to operate.

13. (441) How often are service inspections required?

After equipment is placed on the ready line.

After maintenance.

Once a week.

Once a day.

Service inspections are required after maintenance because maintenance activities can affect the performance and condition of the equipment. By conducting inspections after maintenance, any potential issues or problems that may have arisen during the maintenance process can be identified and addressed promptly. This helps to ensure that the equipment is in proper working order and ready for use. Inspections after maintenance also help to prevent any potential safety hazards or equipment failures that could occur if the equipment is not thoroughly checked after maintenance activities.

Explanation

Service inspections are required after maintenance because maintenance activities can affect the performance and condition of the equipment. By conducting inspections after maintenance, any potential issues or problems that may have arisen during the maintenance process can be identified and addressed promptly. This helps to ensure that the equipment is in proper working order and ready for use. Inspections after maintenance also help to prevent any potential safety hazards or equipment failures that could occur if the equipment is not thoroughly checked after maintenance activities.

14. (421) During a preoperational inspection of a gas turbine engine, you check the intake and exhaust for

Leakage.

Excess heat.

Hairline cracks.

Foreign objects.

During a preoperational inspection of a gas turbine engine, it is important to check the intake and exhaust for foreign objects. This is because foreign objects, such as debris or particles, can obstruct the airflow and cause damage to the engine. Checking for leakage, excess heat, and hairline cracks are also important aspects of the inspection, but in this case, the focus is specifically on identifying and removing any foreign objects that may be present in the intake and exhaust areas.

Explanation

During a preoperational inspection of a gas turbine engine, it is important to check the intake and exhaust for foreign objects. This is because foreign objects, such as debris or particles, can obstruct the airflow and cause damage to the engine. Checking for leakage, excess heat, and hairline cracks are also important aspects of the inspection, but in this case, the focus is specifically on identifying and removing any foreign objects that may be present in the intake and exhaust areas.

15. (432) What happens when the A/M24T–16 load bank set load time has been reached?

The load is automatically removed and the cooling cycle begins.

The load bank will start the load test over again.

The load bank will automatically shuts down.

The display will show results of the load test.

When the A/M24T-16 load bank set load time has been reached, the load is automatically removed and the cooling cycle begins.

Explanation

When the A/M24T-16 load bank set load time has been reached, the load is automatically removed and the cooling cycle begins.

16. (443) To find out where a wire is connected, you should consult the

Flow chart.

Wiring diagram.

Schematic diagram.

Reference designation list.

A wiring diagram is a visual representation of the electrical connections and components in a system. It provides detailed information about the wiring and connections, making it the most suitable resource for finding out where a wire is connected. A flow chart is used to represent a process or decision-making flow, not specific wiring information. A schematic diagram shows the electrical circuitry but may not provide specific wire connection details. A reference designation list is a list of components and their corresponding designations, but it does not provide information about wire connections. Therefore, the most appropriate resource to consult in order to find out where a wire is connected is a wiring diagram.

Explanation

A wiring diagram is a visual representation of the electrical connections and components in a system. It provides detailed information about the wiring and connections, making it the most suitable resource for finding out where a wire is connected. A flow chart is used to represent a process or decision-making flow, not specific wiring information. A schematic diagram shows the electrical circuitry but may not provide specific wire connection details. A reference designation list is a list of components and their corresponding designations, but it does not provide information about wire connections. Therefore, the most appropriate resource to consult in order to find out where a wire is connected is a wiring diagram.

17. (437) To use the fuel from all of its tanks, the A/M32A–60A has a

Fuel gravity system.

Fuel transfer system.

Low fuel level safety circuit.

Manually operated switch to change tanks.

The A/M32A-60A uses a fuel transfer system in order to utilize the fuel from all of its tanks. This system allows for the transfer of fuel between tanks, ensuring that all available fuel is used efficiently. This is necessary to maximize the aircraft's range and operational capabilities. A fuel gravity system would rely on the natural flow of fuel due to gravity, which may not be sufficient for utilizing all fuel. A low fuel level safety circuit would be a safety feature to monitor fuel levels, but it does not address the issue of using fuel from all tanks. A manually operated switch to change tanks would require manual intervention and may not be as efficient as a fuel transfer system.

Explanation

The A/M32A-60A uses a fuel transfer system in order to utilize the fuel from all of its tanks. This system allows for the transfer of fuel between tanks, ensuring that all available fuel is used efficiently. This is necessary to maximize the aircraft's range and operational capabilities. A fuel gravity system would rely on the natural flow of fuel due to gravity, which may not be sufficient for utilizing all fuel. A low fuel level safety circuit would be a safety feature to monitor fuel levels, but it does not address the issue of using fuel from all tanks. A manually operated switch to change tanks would require manual intervention and may not be as efficient as a fuel transfer system.

18. (437) On the A/M32A–60A, the speed at which the butterfly valve opens is determined by

Chamber 2 pressure.

Chamber 4 pressure.

The rate adjustment screw.

The dual-ball selector valve.

The correct answer is the rate adjustment screw. The speed at which the butterfly valve opens on the A/M32A-60A is determined by the rate adjustment screw. This screw allows for the adjustment of the flow rate of air, which in turn affects the speed at which the valve opens. By adjusting the rate adjustment screw, the operator can control the speed of the valve opening to meet the specific requirements of the system.

Explanation

The correct answer is the rate adjustment screw. The speed at which the butterfly valve opens on the A/M32A-60A is determined by the rate adjustment screw. This screw allows for the adjustment of the flow rate of air, which in turn affects the speed at which the valve opens. By adjusting the rate adjustment screw, the operator can control the speed of the valve opening to meet the specific requirements of the system.

19. (430) The A/M24T–16 electrical test set is capable of testing

Aerospace ground equipment (AGE) generator sets only.

Alternating current (AC) power supplies only.

Direct current (DC) power supplies only.

AC and DC power supplies.

The A/M24T-16 electrical test set is capable of testing both AC and DC power supplies. This means that it can be used to test and diagnose electrical systems that use either alternating current or direct current as their power source. It is not limited to testing aerospace ground equipment (AGE) generator sets or only AC or DC power supplies, but rather has the capability to handle both types of power supplies.

Explanation

The A/M24T-16 electrical test set is capable of testing both AC and DC power supplies. This means that it can be used to test and diagnose electrical systems that use either alternating current or direct current as their power source. It is not limited to testing aerospace ground equipment (AGE) generator sets or only AC or DC power supplies, but rather has the capability to handle both types of power supplies.

20. (455) What is the minimum amount of time to operate the B809 generator while performing at load test?

5 minutes.

10 minutes.

15 minutes.

20 minutes.

The minimum amount of time required to operate the B809 generator while performing at load test is 15 minutes. This duration is necessary to ensure that the generator is properly tested under load conditions and can sustain its performance over an extended period. Operating the generator for a shorter time may not provide accurate results or sufficient data to assess its performance and reliability.

Explanation

The minimum amount of time required to operate the B809 generator while performing at load test is 15 minutes. This duration is necessary to ensure that the generator is properly tested under load conditions and can sustain its performance over an extended period. Operating the generator for a shorter time may not provide accurate results or sufficient data to assess its performance and reliability.

21. (435) The resistive elements on the A/M24T–8 test set are best cleaned by

Blowing off with 5 pounds per square inch (psi) uncontaminated air.

Blowing off with 15 psi uncontaminated air.

Scrubbing with soap and water.

Steam cleaning.

The resistive elements on the A/M24T-8 test set are best cleaned by blowing off with 5 pounds per square inch (psi) uncontaminated air. This method is effective because it uses air pressure to remove any dirt or debris that may have accumulated on the resistive elements. Blowing off with 5 psi ensures that enough pressure is applied to effectively clean the elements without causing any damage. Using uncontaminated air is important to prevent introducing any additional contaminants that could affect the performance of the test set.

Explanation

The resistive elements on the A/M24T-8 test set are best cleaned by blowing off with 5 pounds per square inch (psi) uncontaminated air. This method is effective because it uses air pressure to remove any dirt or debris that may have accumulated on the resistive elements. Blowing off with 5 psi ensures that enough pressure is applied to effectively clean the elements without causing any damage. Using uncontaminated air is important to prevent introducing any additional contaminants that could affect the performance of the test set.

22. (445) What is the purpose of the protective circuits of the A/M32A–86D?

Protects the generator electrical system against damage resulting from an overload, overvoltage, undervoltage, and over/underfrequency.

Protects the aircraft electrical system against damage resulting from an overload, overvoltage, undervoltage, and over/underfrequency.

Senses fault conditions, stopping the generator.

Senses fault conditions, stopping the engine.

The protective circuits of the A/M32A-86D serve to safeguard the aircraft electrical system from potential harm caused by various factors such as overload, overvoltage, undervoltage, and over/underfrequency. These circuits are designed to detect fault conditions and prevent any damage to the electrical system by interrupting the power supply or taking appropriate corrective actions.

Explanation

The protective circuits of the A/M32A-86D serve to safeguard the aircraft electrical system from potential harm caused by various factors such as overload, overvoltage, undervoltage, and over/underfrequency. These circuits are designed to detect fault conditions and prevent any damage to the electrical system by interrupting the power supply or taking appropriate corrective actions.

23. (424) Which causes gray or white smoke to pour from the exhaust stack on the gas turbine compressor (GTC)?

Excessive engine revolutions per minute (rpm).

Excessive engine exhaust temperature.

Oil that enters the airflow system.

Fuel mixing with the airflow.

When oil enters the airflow system of a gas turbine compressor (GTC), it can cause gray or white smoke to pour from the exhaust stack. This is because the oil burns and creates smoke when it comes into contact with the hot components of the engine. Excessive engine revolutions per minute (rpm) do not directly cause smoke from the exhaust stack. Similarly, excessive engine exhaust temperature and fuel mixing with the airflow may cause other issues, but they are not specifically related to the smoke pouring from the exhaust stack.

Explanation

When oil enters the airflow system of a gas turbine compressor (GTC), it can cause gray or white smoke to pour from the exhaust stack. This is because the oil burns and creates smoke when it comes into contact with the hot components of the engine. Excessive engine revolutions per minute (rpm) do not directly cause smoke from the exhaust stack. Similarly, excessive engine exhaust temperature and fuel mixing with the airflow may cause other issues, but they are not specifically related to the smoke pouring from the exhaust stack.

24. (408) In component removal, if wires are to be soldered, do not

Resolder them until they have been bench checked.

Cut them, but remove the wiring completely intact.

Resolder them until all wiring has been replaced with new wires.

Cut them unless there is sufficient length remaining for resoldering.

When performing component removal, it is advised not to resolder the wires until they have been bench checked. Instead, the recommended approach is to cut the wires unless there is enough length left for resoldering. This ensures that the wiring is intact and can be properly replaced if needed.

Explanation

When performing component removal, it is advised not to resolder the wires until they have been bench checked. Instead, the recommended approach is to cut the wires unless there is enough length left for resoldering. This ensures that the wiring is intact and can be properly replaced if needed.

25. (442) The health hazards associated with the gas turbine generator set include

Its operating 5 times faster than a car engine.

Noise, intense heat, and electrical shock.

Excessive carbon monoxide buildup.

Turbine wheel disintegration.

The health hazards associated with the gas turbine generator set include noise, intense heat, and electrical shock. Gas turbine generator sets produce a significant amount of noise due to the high-speed rotation of the turbine blades and the combustion process. This noise can lead to hearing damage and other related health issues. Additionally, the intense heat generated by the turbine can cause burns and other thermal injuries if proper precautions are not taken. Finally, the presence of electrical components and high voltage in the generator set poses a risk of electrical shock, which can be fatal or cause severe injuries.

Explanation

The health hazards associated with the gas turbine generator set include noise, intense heat, and electrical shock. Gas turbine generator sets produce a significant amount of noise due to the high-speed rotation of the turbine blades and the combustion process. This noise can lead to hearing damage and other related health issues. Additionally, the intense heat generated by the turbine can cause burns and other thermal injuries if proper precautions are not taken. Finally, the presence of electrical components and high voltage in the generator set poses a risk of electrical shock, which can be fatal or cause severe injuries.

26. (444) When the "flag" of the air service indicator is locked into the top of the viewing chamber, what does this mean?

Pressure sufficient for bleed operations.

Air filter sufficient for operations.

Pressure sufficient for operations.

Air filter needs to be changed.

When the "flag" of the air service indicator is locked into the top of the viewing chamber, it indicates that the air filter needs to be changed. This is because the "flag" serves as a visual indicator that the air filter has become dirty or clogged and needs to be replaced.

Explanation

When the "flag" of the air service indicator is locked into the top of the viewing chamber, it indicates that the air filter needs to be changed. This is because the "flag" serves as a visual indicator that the air filter has become dirty or clogged and needs to be replaced.

27. (418) The boost pump on the gas turbine engine provides fuel to the

Fuel atomizer.

Main fuel pump.

Combustion chamber.

Fuel air mixture valve.

The boost pump on the gas turbine engine provides fuel to the main fuel pump. The main fuel pump is responsible for supplying pressurized fuel to the combustion chamber. The boost pump helps to ensure a consistent flow of fuel to the main fuel pump, ensuring proper fuel delivery to the combustion chamber for efficient combustion.

Explanation

The boost pump on the gas turbine engine provides fuel to the main fuel pump. The main fuel pump is responsible for supplying pressurized fuel to the combustion chamber. The boost pump helps to ensure a consistent flow of fuel to the main fuel pump, ensuring proper fuel delivery to the combustion chamber for efficient combustion.

28. (449) What component on the EPU–6/E frequency converter stops input voltage if the bottom door is open?

Safety interlock.

EF line fuse.

Start switch.

Stop switch.

The safety interlock on the EPU-6/E frequency converter is the component that stops the input voltage if the bottom door is open. This is an important safety feature to prevent any accidents or damage that could occur if the converter is accessed while it is still powered. The safety interlock ensures that the input voltage is cut off whenever the bottom door is open, providing a safe working environment for maintenance or troubleshooting activities.

Explanation

The safety interlock on the EPU-6/E frequency converter is the component that stops the input voltage if the bottom door is open. This is an important safety feature to prevent any accidents or damage that could occur if the converter is accessed while it is still powered. The safety interlock ensures that the input voltage is cut off whenever the bottom door is open, providing a safe working environment for maintenance or troubleshooting activities.

29. (450) Before using the EPU–6/E frequency converter, you must inspect the

Air inlets for blockage.

Wiring for secure mounting.

Maintenance panels for corrosion.

Interior air vents for secure mounting.

Before using the EPU-6/E frequency converter, it is necessary to inspect the air inlets for blockage. This is important because blockage in the air inlets can restrict the flow of air, leading to inadequate cooling of the converter. Inspecting the air inlets ensures that there are no obstructions that could hinder the proper functioning of the converter.

Explanation

Before using the EPU-6/E frequency converter, it is necessary to inspect the air inlets for blockage. This is important because blockage in the air inlets can restrict the flow of air, leading to inadequate cooling of the converter. Inspecting the air inlets ensures that there are no obstructions that could hinder the proper functioning of the converter.

30. (405) The stator windings of a synchronous motor are spaced

20 degrees apart.

30 degrees apart.

90 degrees apart.

120 degrees apart.

The stator windings of a synchronous motor are spaced 120 degrees apart. This is because a synchronous motor operates on the principle of magnetic fields rotating at a synchronous speed. The stator windings are responsible for creating the rotating magnetic field, and in order to achieve a smooth and efficient rotation, the windings need to be evenly spaced around the stator. A spacing of 120 degrees ensures that the magnetic field produced by each winding is evenly distributed and allows for optimal performance of the motor.

Explanation

The stator windings of a synchronous motor are spaced 120 degrees apart. This is because a synchronous motor operates on the principle of magnetic fields rotating at a synchronous speed. The stator windings are responsible for creating the rotating magnetic field, and in order to achieve a smooth and efficient rotation, the windings need to be evenly spaced around the stator. A spacing of 120 degrees ensures that the magnetic field produced by each winding is evenly distributed and allows for optimal performance of the motor.

31. (426) Which three things are necessary to produce an electromotive force (EMF) mechanically?

EMF, relative motion, and magnetic field.

Magnet, lines of force, and relative motion.

Magnetic field, a conductor, and relative motion.

Counter-electromotive force (CEMF), a conductor, and magnetic field.

To produce an electromotive force (EMF) mechanically, three things are necessary: a magnetic field, a conductor, and relative motion. The presence of a magnetic field induces a voltage in a conductor when there is relative motion between them. This phenomenon is known as electromagnetic induction and is the basis for generating electricity in devices such as generators and alternators. The magnetic field interacts with the moving conductor, creating a force that pushes the electrons in the conductor, resulting in the generation of an EMF.

Explanation

To produce an electromotive force (EMF) mechanically, three things are necessary: a magnetic field, a conductor, and relative motion. The presence of a magnetic field induces a voltage in a conductor when there is relative motion between them. This phenomenon is known as electromagnetic induction and is the basis for generating electricity in devices such as generators and alternators. The magnetic field interacts with the moving conductor, creating a force that pushes the electrons in the conductor, resulting in the generation of an EMF.

32. (411) What component holds a large amount of coolant in close contact with a large volume of air?

Radiator cap.

Thermostat.

Water pump.

Radiator.

The radiator holds a large amount of coolant in close contact with a large volume of air. It is designed to transfer heat from the coolant to the surrounding air, allowing the coolant to cool down before it is circulated back into the engine. The radiator consists of a series of tubes and fins that increase the surface area for better heat dissipation. As coolant flows through the tubes, it releases heat to the fins, and the air passing over the fins carries away the heat, cooling the coolant in the process.

Explanation

The radiator holds a large amount of coolant in close contact with a large volume of air. It is designed to transfer heat from the coolant to the surrounding air, allowing the coolant to cool down before it is circulated back into the engine. The radiator consists of a series of tubes and fins that increase the surface area for better heat dissipation. As coolant flows through the tubes, it releases heat to the fins, and the air passing over the fins carries away the heat, cooling the coolant in the process.

33. (416) During starting, the turbine engine is rotated up to 20 percent by the

Alternating current (AC) generator.

Fuel pump and control unit.

Tachometer generator.

Starter motor.

During starting, the turbine engine needs to be rotated in order to initiate the combustion process. The rotating motion is provided by the starter motor, which is specifically designed for this purpose. The AC generator, fuel pump and control unit, and tachometer generator are not responsible for rotating the turbine engine during starting.

Explanation

During starting, the turbine engine needs to be rotated in order to initiate the combustion process. The rotating motion is provided by the starter motor, which is specifically designed for this purpose. The AC generator, fuel pump and control unit, and tachometer generator are not responsible for rotating the turbine engine during starting.

34. (418) The turbine engine component that prevents fuel from accumulating in the plenum is the

Atomizer.

Drain valve.

Pneumatic control device.

Acceleration limiter valve.

The drain valve is the turbine engine component that prevents fuel from accumulating in the plenum. The plenum is a chamber where fuel is stored before being injected into the combustion chamber. If fuel were to accumulate in the plenum, it could result in a dangerous buildup of fuel that could potentially cause an explosion. The drain valve is responsible for removing any excess fuel or condensation that may collect in the plenum, ensuring safe and efficient operation of the turbine engine.

Explanation

The drain valve is the turbine engine component that prevents fuel from accumulating in the plenum. The plenum is a chamber where fuel is stored before being injected into the combustion chamber. If fuel were to accumulate in the plenum, it could result in a dangerous buildup of fuel that could potentially cause an explosion. The drain valve is responsible for removing any excess fuel or condensation that may collect in the plenum, ensuring safe and efficient operation of the turbine engine.

35. (434) The preliminary setup step that must be taken for the portable load bank to function properly is to position the

Cooling fans blowing into prevailing wind.

Cooling fans blowing not into prevailing wind.

Load bank close to generator to eliminate line drop.

Load bank as far as possible from generator for cooling.

The correct answer is "cooling fans blowing not into prevailing wind." This is because positioning the cooling fans to blow against the prevailing wind would create a counterproductive airflow, hindering the cooling process. By positioning the cooling fans to blow in a direction opposite to the prevailing wind, the load bank can effectively dissipate heat and maintain optimal operating conditions.

Explanation

The correct answer is "cooling fans blowing not into prevailing wind." This is because positioning the cooling fans to blow against the prevailing wind would create a counterproductive airflow, hindering the cooling process. By positioning the cooling fans to blow in a direction opposite to the prevailing wind, the load bank can effectively dissipate heat and maintain optimal operating conditions.

36. (437) If the oil pressure switch opens during operation of A/M32A–60A, during which period does it stop operation?

From 0 to 35 percent.

From 35 to 95 percent.

From 95 to 100 percent.

Anytime during operation.

The oil pressure switch is a safety device that monitors the oil pressure in the A/M32A-60A during operation. If the switch opens, it means that the oil pressure has dropped below a certain threshold, indicating a potential problem with the system. Since the question asks when the operation stops if the switch opens, the correct answer is "Anytime during operation." This means that the system can stop functioning at any point, regardless of the percentage of operation completed.

Explanation

The oil pressure switch is a safety device that monitors the oil pressure in the A/M32A-60A during operation. If the switch opens, it means that the oil pressure has dropped below a certain threshold, indicating a potential problem with the system. Since the question asks when the operation stops if the switch opens, the correct answer is "Anytime during operation." This means that the system can stop functioning at any point, regardless of the percentage of operation completed.

37. (448) What indicator on the EPU–6/E frequency converter indicates an undervoltage condition?

Overvoltage.

Out-of-phase.

Undervoltage.

Fault.

The correct answer is "Undervoltage." This means that the indicator on the EPU-6/E frequency converter will show an undervoltage condition. This indicates that the voltage supplied to the converter is below the normal or expected level.

Explanation

The correct answer is "Undervoltage." This means that the indicator on the EPU-6/E frequency converter will show an undervoltage condition. This indicates that the voltage supplied to the converter is below the normal or expected level.

38. (438) After the A/M32A–60A generator set has shut itself down due to low fuel, the fuel level relay, K4, must be reset by

Turning the start switch OFF, then ON.

Turning the master switch OFF, then ON.

De-energizing the low-level lockout relay.

De-energizing the low-level warning switch.

The correct answer is turning the master switch OFF, then ON. This is because the fuel level relay, K4, is connected to the master switch and resetting the master switch will reset the relay. By turning the master switch OFF and then ON, the relay will be reset and the generator set can be restarted.

Explanation

The correct answer is turning the master switch OFF, then ON. This is because the fuel level relay, K4, is connected to the master switch and resetting the master switch will reset the relay. By turning the master switch OFF and then ON, the relay will be reset and the generator set can be restarted.

39. (408) Perform an operational check of the unit

At the last minute.

With the defective part removed.

Before final reassembly of the enclosure.

As soon as you replace the defective part.

Performing an operational check of the unit before final reassembly of the enclosure ensures that the unit is functioning properly and all components are working as expected. This step allows any issues or defects to be identified and addressed before the final reassembly, reducing the risk of having to disassemble the enclosure again if a problem is discovered later. It also ensures that the unit is fully tested and ready for use once it is reassembled.

Explanation

Performing an operational check of the unit before final reassembly of the enclosure ensures that the unit is functioning properly and all components are working as expected. This step allows any issues or defects to be identified and addressed before the final reassembly, reducing the risk of having to disassemble the enclosure again if a problem is discovered later. It also ensures that the unit is fully tested and ready for use once it is reassembled.

40. (426) The internal current produced by all electromechanical generators is

Alternating current (AC).

Direct current (DC).

Pulsating AC.

Pulsating DC.

Electromechanical generators convert mechanical energy into electrical energy. In these generators, a rotating coil or magnet induces a changing magnetic field, which in turn generates an alternating current (AC) in the wire. AC refers to the current that periodically changes direction, typically at a frequency of 50 or 60 cycles per second. This is in contrast to direct current (DC), which flows in only one direction. Therefore, the correct answer is alternating current (AC) as it accurately describes the internal current produced by electromechanical generators.

Explanation

Electromechanical generators convert mechanical energy into electrical energy. In these generators, a rotating coil or magnet induces a changing magnetic field, which in turn generates an alternating current (AC) in the wire. AC refers to the current that periodically changes direction, typically at a frequency of 50 or 60 cycles per second. This is in contrast to direct current (DC), which flows in only one direction. Therefore, the correct answer is alternating current (AC) as it accurately describes the internal current produced by electromechanical generators.

41. (417) During operation of a turbine engine, fuel and air are mixed and ignited in the

Fuel atomizer.

Combustor can.

Mixer assembly.

Plenum chamber.

During the operation of a turbine engine, fuel and air are mixed and ignited in the combustor can. The combustor can is a component of the engine where combustion takes place. It is designed to provide a controlled environment for the fuel and air mixture to burn efficiently and generate the necessary energy to drive the turbine. The combustor can is typically located between the compressor and the turbine sections of the engine.

Explanation

During the operation of a turbine engine, fuel and air are mixed and ignited in the combustor can. The combustor can is a component of the engine where combustion takes place. It is designed to provide a controlled environment for the fuel and air mixture to burn efficiently and generate the necessary energy to drive the turbine. The combustor can is typically located between the compressor and the turbine sections of the engine.

42. (440) On the A/M32A–60A generator, what stops battery charging when the batteries are fully charged and prevents discharge when the unit is shut down?

Battery charging resistor.

Battery charging diode.

Voltage regulator.

Charging shunt.

The battery charging diode stops battery charging when the batteries are fully charged and prevents discharge when the unit is shut down. A diode is an electronic component that allows current to flow in only one direction. In this case, the diode is placed in the charging circuit and acts as a one-way valve, allowing current to flow from the generator to the batteries for charging but preventing current from flowing back from the batteries to the generator when it is shut down. This ensures that the batteries do not overcharge and that they retain their charge when the generator is not in use.

Explanation

The battery charging diode stops battery charging when the batteries are fully charged and prevents discharge when the unit is shut down. A diode is an electronic component that allows current to flow in only one direction. In this case, the diode is placed in the charging circuit and acts as a one-way valve, allowing current to flow from the generator to the batteries for charging but preventing current from flowing back from the batteries to the generator when it is shut down. This ensures that the batteries do not overcharge and that they retain their charge when the generator is not in use.

43. (410) Which function of a lubricant compensates for microscopic irregularities in the cylinder wall?

Cooling.

Sealing.

Cleaning.

Reducing friction.

The function of a lubricant that compensates for microscopic irregularities in the cylinder wall is sealing. When a lubricant is applied to the cylinder wall, it forms a thin film that fills in the tiny gaps and imperfections on the surface. This helps to create a smooth and even surface, reducing the chances of leakage and improving the overall sealing of the cylinder.

Explanation

The function of a lubricant that compensates for microscopic irregularities in the cylinder wall is sealing. When a lubricant is applied to the cylinder wall, it forms a thin film that fills in the tiny gaps and imperfections on the surface. This helps to create a smooth and even surface, reducing the chances of leakage and improving the overall sealing of the cylinder.

44. (444) To stop the A/M32A–86D engine, the engine stop control

Opens the magneto circuit.

Energizes the shutdown solenoid.

De-energizes the engine run/idle circuit.

Puts the fuel rack in the NO-FUEL position.

The correct answer is "puts the fuel rack in the NO-FUEL position." When the engine stop control is activated, it moves the fuel rack to the NO-FUEL position, which cuts off the fuel supply to the engine. This effectively stops the engine from running. Opening the magneto circuit or energizing the shutdown solenoid are not the correct actions to stop the engine. De-energizing the engine run/idle circuit would also not directly stop the engine.

Explanation

The correct answer is "puts the fuel rack in the NO-FUEL position." When the engine stop control is activated, it moves the fuel rack to the NO-FUEL position, which cuts off the fuel supply to the engine. This effectively stops the engine from running. Opening the magneto circuit or energizing the shutdown solenoid are not the correct actions to stop the engine. De-energizing the engine run/idle circuit would also not directly stop the engine.

45. (438) In the event of an overspeed condition, what component of the A/M32A–60A generator electrical system stops the engine?

Overspeed actuator.

Fuel shutoff switch.

35 percent centrifugal switch.

110 percent centrifugal switch.

The 110 percent centrifugal switch is the component of the A/M32A-60A generator electrical system that stops the engine in the event of an overspeed condition. When the engine reaches 110 percent of its normal operating speed, the centrifugal switch is triggered and interrupts the electrical circuit, shutting down the engine to prevent further damage or failure.

Explanation

The 110 percent centrifugal switch is the component of the A/M32A-60A generator electrical system that stops the engine in the event of an overspeed condition. When the engine reaches 110 percent of its normal operating speed, the centrifugal switch is triggered and interrupts the electrical circuit, shutting down the engine to prevent further damage or failure.

46. (420) The time required to open the load control valve on the turbine engine is controlled by the

Mechanical linkage.

Actuator diaphragm.

Rate adjustment screw.

Actuator return spring.

The correct answer is the rate adjustment screw. The time required to open the load control valve on the turbine engine is controlled by the rate adjustment screw. This screw is responsible for adjusting the rate at which the valve opens, allowing for precise control of the flow of fuel or air into the engine. By adjusting the rate, the engine can be optimized for different operating conditions, ensuring efficient and reliable performance. The mechanical linkage, actuator diaphragm, and actuator return spring may play a role in the overall operation of the load control valve, but they do not directly control the time required to open it.

Explanation

The correct answer is the rate adjustment screw. The time required to open the load control valve on the turbine engine is controlled by the rate adjustment screw. This screw is responsible for adjusting the rate at which the valve opens, allowing for precise control of the flow of fuel or air into the engine. By adjusting the rate, the engine can be optimized for different operating conditions, ensuring efficient and reliable performance. The mechanical linkage, actuator diaphragm, and actuator return spring may play a role in the overall operation of the load control valve, but they do not directly control the time required to open it.

47. (439) When the frequency meter on the A/M32A–60A generator set is defective, you must

Check operation of frequency meter network unit (MT2).

Replace both the meter M2 and MT2 unit as a set.

Deadline the equipment until the cause is found.

Repair or replace the frequency motor.

When the frequency meter on the A/M32A-60A generator set is defective, the correct action is to replace both the meter M2 and the MT2 unit as a set. This ensures that both components are working properly and eliminates the possibility of any issues arising from using mismatched or incompatible parts. Simply checking the operation of the frequency meter network unit (MT2) may not be sufficient to address the problem, and repairing or replacing just the frequency motor may not solve the issue if the meter itself is also faulty.

Explanation

When the frequency meter on the A/M32A-60A generator set is defective, the correct action is to replace both the meter M2 and the MT2 unit as a set. This ensures that both components are working properly and eliminates the possibility of any issues arising from using mismatched or incompatible parts. Simply checking the operation of the frequency meter network unit (MT2) may not be sufficient to address the problem, and repairing or replacing just the frequency motor may not solve the issue if the meter itself is also faulty.

48. (422) Normal acceleration characteristics of the gas turbine compressor (GTC) include

Sudden rumbling noises after 35 percent.

A decrease in vibration after 35 percent.

Smooth and quiet acceleration.

Burping.

The normal acceleration characteristics of a gas turbine compressor (GTC) include a decrease in vibration after 35 percent. This means that as the GTC accelerates, the vibration levels initially increase but then start to decrease after it reaches 35 percent of its acceleration. This decrease in vibration is considered normal and indicates that the GTC is operating smoothly and without any issues.

Explanation

The normal acceleration characteristics of a gas turbine compressor (GTC) include a decrease in vibration after 35 percent. This means that as the GTC accelerates, the vibration levels initially increase but then start to decrease after it reaches 35 percent of its acceleration. This decrease in vibration is considered normal and indicates that the GTC is operating smoothly and without any issues.

49. (440) To charge the batteries of the A/M32A–60A generator set, the operator must

Reset the alternating current (AC) system.

Reset the direct current (DC) system.

Connect an external source.

Turn on the battery charger.

To charge the batteries of the A/M32A-60A generator set, the operator needs to reset the alternating current (AC) system. This suggests that there might be a fault or interruption in the AC system, which needs to be reset in order to restore the power supply to the battery charger. Resetting the AC system would ensure that the batteries receive the necessary charging voltage from the generator set.

Explanation

To charge the batteries of the A/M32A-60A generator set, the operator needs to reset the alternating current (AC) system. This suggests that there might be a fault or interruption in the AC system, which needs to be reset in order to restore the power supply to the battery charger. Resetting the AC system would ensure that the batteries receive the necessary charging voltage from the generator set.

50. (443) When troubleshooting, the actual location of a terminal connection on the unit can best be found by using

The wiring diagram.

Your past experience.

The schematic diagram.

The reference designation.

The correct answer is the wiring diagram. When troubleshooting, the wiring diagram provides a visual representation of the electrical connections and circuits within the unit. By referring to the wiring diagram, one can identify the specific terminal connection and its location, aiding in the troubleshooting process. Past experience may be helpful, but it may not always provide accurate information for the specific unit being worked on. The schematic diagram provides a more detailed overview of the electrical system, but it may not explicitly show the physical location of the terminal connection. The reference designation is a labeling system used in technical documentation, but it does not directly provide information about the physical location of the terminal connection.

Explanation

The correct answer is the wiring diagram. When troubleshooting, the wiring diagram provides a visual representation of the electrical connections and circuits within the unit. By referring to the wiring diagram, one can identify the specific terminal connection and its location, aiding in the troubleshooting process. Past experience may be helpful, but it may not always provide accurate information for the specific unit being worked on. The schematic diagram provides a more detailed overview of the electrical system, but it may not explicitly show the physical location of the terminal connection. The reference designation is a labeling system used in technical documentation, but it does not directly provide information about the physical location of the terminal connection.

51. (412) The advantage of using a turbocharger on a diesel engine is the fuel consumption is

Decreased because of the increased internal operating temperature of the engine.

Increased because of the better mixing of the fuel with the air charge.

Used more efficiently and horsepower is increased.

Used more efficiently and horsepower is decreased.

A turbocharger on a diesel engine increases the efficiency of fuel usage by compressing the air intake, allowing more air to enter the engine. This results in better mixing of the fuel with the air charge, leading to more efficient combustion and increased horsepower. Therefore, the fuel is used more efficiently and the horsepower is increased.

Explanation

A turbocharger on a diesel engine increases the efficiency of fuel usage by compressing the air intake, allowing more air to enter the engine. This results in better mixing of the fuel with the air charge, leading to more efficient combustion and increased horsepower. Therefore, the fuel is used more efficiently and the horsepower is increased.

52. (438) The A/M32A–60A generator set cannot be loaded either electrically or pneumatically until after the

35 percent switch has closed.

95 percent switch has closed.

110 percent switch has opened.

BLEED AIR ON switch is closed.

The correct answer is 95 percent switch has closed. This means that the generator set cannot be loaded electrically or pneumatically until the 95 percent switch has closed. This switch is likely a safety measure to ensure that the generator is operating at a certain level of efficiency before it can be loaded. Once the switch is closed, the generator can be loaded and used for its intended purpose.

Explanation

The correct answer is 95 percent switch has closed. This means that the generator set cannot be loaded electrically or pneumatically until the 95 percent switch has closed. This switch is likely a safety measure to ensure that the generator is operating at a certain level of efficiency before it can be loaded. Once the switch is closed, the generator can be loaded and used for its intended purpose.

53. (438) The component of the A/M32A–60A that opens and closes the fuel transfer line is the fuel

Level switch, S20.

Solenoid valve, L1.

Level control relay, K26.

Level solenoid valve, L4.

The correct answer is the level solenoid valve, L4. The question is asking for the component of the A/M32A-60A that opens and closes the fuel transfer line. The level solenoid valve, L4, is responsible for controlling the fuel flow by opening and closing the fuel transfer line. This valve is activated by an electrical signal and is used to maintain the appropriate fuel level in the system.

Explanation

The correct answer is the level solenoid valve, L4. The question is asking for the component of the A/M32A-60A that opens and closes the fuel transfer line. The level solenoid valve, L4, is responsible for controlling the fuel flow by opening and closing the fuel transfer line. This valve is activated by an electrical signal and is used to maintain the appropriate fuel level in the system.

54. (403) In order to operate, a single-phase induction motor requires

Brushes.

Slip rings.

A commutator.

A starting system.

A single-phase induction motor requires a starting system in order to operate. Unlike a three-phase induction motor, a single-phase induction motor does not have a rotating magnetic field to start the motor by itself. Instead, it requires an external starting system such as a capacitor start or a split-phase start mechanism to provide the necessary starting torque. The starting system helps to create a rotating magnetic field and initiates the motor's rotation, allowing it to operate efficiently. Therefore, a starting system is essential for the operation of a single-phase induction motor.

Explanation

A single-phase induction motor requires a starting system in order to operate. Unlike a three-phase induction motor, a single-phase induction motor does not have a rotating magnetic field to start the motor by itself. Instead, it requires an external starting system such as a capacitor start or a split-phase start mechanism to provide the necessary starting torque. The starting system helps to create a rotating magnetic field and initiates the motor's rotation, allowing it to operate efficiently. Therefore, a starting system is essential for the operation of a single-phase induction motor.

55. (438) On the A/M32A–60A generator, the starter motor relay is de-energized when the

Start switch opens.

Start switch closes.

35 percent switch opens.

35 percent switch closes.

The correct answer is "35 percent switch opens." This means that the starter motor relay on the A/M32A-60A generator is de-energized when the 35 percent switch is opened. This suggests that the 35 percent switch plays a role in controlling the operation of the starter motor relay, and when it is opened, the relay is no longer energized. The specific function or purpose of the 35 percent switch in relation to the generator's operation is not provided in the given information.

Explanation

The correct answer is "35 percent switch opens." This means that the starter motor relay on the A/M32A-60A generator is de-energized when the 35 percent switch is opened. This suggests that the 35 percent switch plays a role in controlling the operation of the starter motor relay, and when it is opened, the relay is no longer energized. The specific function or purpose of the 35 percent switch in relation to the generator's operation is not provided in the given information.

56. (403) Which induction motor has the highest starting torque?

Capacitive start.

Squirrel cage.

Shaded pole.

Split phase

Capacitive start induction motors have the highest starting torque compared to squirrel cage, shaded pole, and split phase induction motors. This is because the capacitive start motor uses a capacitor in series with the starting winding, which creates a phase shift between the main and starting windings. This phase shift produces a rotating magnetic field, resulting in a higher starting torque. Squirrel cage, shaded pole, and split phase induction motors have lower starting torques compared to capacitive start motors.

Explanation

Capacitive start induction motors have the highest starting torque compared to squirrel cage, shaded pole, and split phase induction motors. This is because the capacitive start motor uses a capacitor in series with the starting winding, which creates a phase shift between the main and starting windings. This phase shift produces a rotating magnetic field, resulting in a higher starting torque. Squirrel cage, shaded pole, and split phase induction motors have lower starting torques compared to capacitive start motors.

57. (424) If no oil pressure is available from the main oil pump assembly on the gas turbine compressor (GTC), what should you replace?

Oil pump.

Entire assembly.

Flow check valve.

Filter bypass relief valve.

If no oil pressure is available from the main oil pump assembly on the gas turbine compressor (GTC), the entire assembly should be replaced. This is because if there is no oil pressure, it indicates a malfunction or failure in the entire assembly, and replacing just one component like the pump or valve may not solve the issue. Replacing the entire assembly ensures that all the components are new and functioning properly, restoring the oil pressure to the required level for the GTC.

Explanation

If no oil pressure is available from the main oil pump assembly on the gas turbine compressor (GTC), the entire assembly should be replaced. This is because if there is no oil pressure, it indicates a malfunction or failure in the entire assembly, and replacing just one component like the pump or valve may not solve the issue. Replacing the entire assembly ensures that all the components are new and functioning properly, restoring the oil pressure to the required level for the GTC.

58. (409) Aside from idle speed, the limiting speed governor through the use of flyweights and spring tension controls

Load speed.

Minimum speed.

Maximum speed.

Intermediate speed.

The limiting speed governor, which utilizes flyweights and spring tension controls, is responsible for regulating the maximum speed of a device or machine. It ensures that the speed does not exceed a certain limit, preventing any potential damage or hazards. Therefore, the correct answer is maximum speed.

Explanation

The limiting speed governor, which utilizes flyweights and spring tension controls, is responsible for regulating the maximum speed of a device or machine. It ensures that the speed does not exceed a certain limit, preventing any potential damage or hazards. Therefore, the correct answer is maximum speed.

59. (426) To increase the output of a generator, you must increase the

Load.

Resistance of the conductor.

Strength of the magnetic field.

Counter-electromotive force (CEMF).

To increase the output of a generator, the strength of the magnetic field must be increased. This is because the generator works on the principle of electromagnetic induction, where a magnetic field is used to induce a current in a conductor. By increasing the strength of the magnetic field, more lines of magnetic flux are cut by the conductor, resulting in a higher induced voltage and therefore a greater output from the generator.

Explanation

To increase the output of a generator, the strength of the magnetic field must be increased. This is because the generator works on the principle of electromagnetic induction, where a magnetic field is used to induce a current in a conductor. By increasing the strength of the magnetic field, more lines of magnetic flux are cut by the conductor, resulting in a higher induced voltage and therefore a greater output from the generator.

60. (433) The A/M24T–16 load bank equipped is equipped with how many diagnostic features?

One.

Two.

Three.

Seven.

The A/M24T-16 load bank is equipped with three diagnostic features.

Explanation

The A/M24T-16 load bank is equipped with three diagnostic features.

61. (412) What must be accomplished to supercharge a diesel engine?

Change the overlap and timing so that the intake and exhaust valves are not open at the same time.

Change the overlap and timing so that the intake and exhaust valves are open at the same time.

Advance exhaust valve opening time.

Retard intake valve opening time.

To supercharge a diesel engine, the overlap and timing must be changed so that the intake and exhaust valves are open at the same time. This allows for better air flow and combustion efficiency, resulting in increased power and performance. By opening both valves simultaneously, the engine can take in more air and expel exhaust gases more effectively, leading to improved overall engine performance.

Explanation

To supercharge a diesel engine, the overlap and timing must be changed so that the intake and exhaust valves are open at the same time. This allows for better air flow and combustion efficiency, resulting in increased power and performance. By opening both valves simultaneously, the engine can take in more air and expel exhaust gases more effectively, leading to improved overall engine performance.

62. (417) The component of the gas turbine engine that causes the air velocity to be reduced, resulting in an increase in pressure, is the

Nozzle ring.

Turbine wheel.

Torus assembly.

Divergent diffuser.

The correct answer is divergent diffuser. A divergent diffuser is a component of a gas turbine engine that is responsible for reducing the air velocity and increasing the pressure. It is designed to expand the flow area of the air, allowing it to slow down and convert its kinetic energy into pressure energy. This helps to improve the efficiency and performance of the engine by ensuring that the air is at the appropriate pressure for combustion and subsequent power generation.

Explanation

The correct answer is divergent diffuser. A divergent diffuser is a component of a gas turbine engine that is responsible for reducing the air velocity and increasing the pressure. It is designed to expand the flow area of the air, allowing it to slow down and convert its kinetic energy into pressure energy. This helps to improve the efficiency and performance of the engine by ensuring that the air is at the appropriate pressure for combustion and subsequent power generation.

63. (419) Gas turbine compressor (GTC) operation with insufficient oil pressure is prevented by the

Oil pressure solenoid.

Oil pressure switch.

Oil drain switch.

Ignition coil.

The oil pressure switch is responsible for preventing the operation of the gas turbine compressor (GTC) when there is insufficient oil pressure. This switch is designed to monitor the oil pressure and if it falls below a certain threshold, it sends a signal to shut down the GTC. By doing so, it helps to protect the GTC from damage that could occur due to inadequate lubrication. The oil pressure solenoid, oil drain switch, and ignition coil are not directly related to preventing GTC operation with insufficient oil pressure.

Explanation

The oil pressure switch is responsible for preventing the operation of the gas turbine compressor (GTC) when there is insufficient oil pressure. This switch is designed to monitor the oil pressure and if it falls below a certain threshold, it sends a signal to shut down the GTC. By doing so, it helps to protect the GTC from damage that could occur due to inadequate lubrication. The oil pressure solenoid, oil drain switch, and ignition coil are not directly related to preventing GTC operation with insufficient oil pressure.

64. (403) The difference in the rotor's speed of rotation and the stator magnetic field is known as

Differential.

Torque.

Slip.

Drag.

The difference in the rotor's speed of rotation and the stator magnetic field is known as slip. Slip is an important concept in electrical machines, particularly in induction motors. It represents the relative speed between the rotating magnetic field produced by the stator and the rotor. Slip is necessary for the production of torque in the motor, as it creates a rotating magnetic field that induces currents in the rotor, resulting in the generation of torque. Therefore, slip is the correct answer as it accurately describes the difference in speed between the rotor and the stator magnetic field.

Explanation

The difference in the rotor's speed of rotation and the stator magnetic field is known as slip. Slip is an important concept in electrical machines, particularly in induction motors. It represents the relative speed between the rotating magnetic field produced by the stator and the rotor. Slip is necessary for the production of torque in the motor, as it creates a rotating magnetic field that induces currents in the rotor, resulting in the generation of torque. Therefore, slip is the correct answer as it accurately describes the difference in speed between the rotor and the stator magnetic field.

65. (439) To complete the exciter field circuit of the A/M32A–60A generator, the operator must

Reset the alternating current (AC) contactor switch.

Depress the AC contactor “closed” indicator.

Reset the output field circuit.

Open the load control relay.

The correct answer is to reset the alternating current (AC) contactor switch. This is because the exciter field circuit of the A/M32A-60A generator needs to be completed, and resetting the AC contactor switch is necessary to achieve this.

Explanation

The correct answer is to reset the alternating current (AC) contactor switch. This is because the exciter field circuit of the A/M32A-60A generator needs to be completed, and resetting the AC contactor switch is necessary to achieve this.

66. (409) The constant-stroke pump plunger determines the amount of fuel delivered by the position of a

Bypass port.

Vertical slot.

Helical groove.

Delivery valve.

The correct answer is helical groove. In a constant-stroke pump, the fuel is delivered by the position of a helical groove. The helical groove is a spiral-shaped channel on the plunger that controls the flow of fuel. As the plunger moves up and down, the helical groove allows fuel to enter and exit the pumping chamber, determining the amount of fuel delivered. This design ensures a consistent and controlled flow of fuel to the engine.

Explanation

The correct answer is helical groove. In a constant-stroke pump, the fuel is delivered by the position of a helical groove. The helical groove is a spiral-shaped channel on the plunger that controls the flow of fuel. As the plunger moves up and down, the helical groove allows fuel to enter and exit the pumping chamber, determining the amount of fuel delivered. This design ensures a consistent and controlled flow of fuel to the engine.

67. (445) What type of current transformers are T4, T5, and T6 on the A/M32A–86D generator set?

Generator overload.

Generator field.

Line drop.

Ammeter.

The T4, T5, and T6 current transformers on the A/M32A-86D generator set are used to measure the line drop. Line drop refers to the decrease in voltage that occurs as electricity travels through a transmission line due to resistance and impedance. By measuring the line drop, these current transformers can provide information about the efficiency and performance of the generator set.

Explanation

The T4, T5, and T6 current transformers on the A/M32A-86D generator set are used to measure the line drop. Line drop refers to the decrease in voltage that occurs as electricity travels through a transmission line due to resistance and impedance. By measuring the line drop, these current transformers can provide information about the efficiency and performance of the generator set.

68. (437) What is used as a reference for controlling A/M32A–60A engine speed?

Fuel pressure.

Control air pressure.

Governor flyweight pressure.

Alternating current (AC) generator output frequency.

The correct answer is Alternating current (AC) generator output frequency. The AC generator output frequency is used as a reference for controlling the engine speed of the A/M32A-60A. This means that the engine speed is adjusted based on the frequency of the AC generator output.

Explanation

The correct answer is Alternating current (AC) generator output frequency. The AC generator output frequency is used as a reference for controlling the engine speed of the A/M32A-60A. This means that the engine speed is adjusted based on the frequency of the AC generator output.

69. (429) In a three-phase alternating current (AC) generator, direct current (DC) is applied to the field windings through the brushes and

Diodes.

Rectifier.

Slip rings.

Commutator.

In a three-phase AC generator, the field windings are supplied with direct current (DC) through the slip rings. Slip rings are rotating conductive rings that make electrical contact with stationary brushes, allowing the DC current to flow into the field windings. This creates a magnetic field that induces the alternating current in the generator's stator windings. The use of slip rings enables the generator to produce a continuous AC output.

Explanation

In a three-phase AC generator, the field windings are supplied with direct current (DC) through the slip rings. Slip rings are rotating conductive rings that make electrical contact with stationary brushes, allowing the DC current to flow into the field windings. This creates a magnetic field that induces the alternating current in the generator's stator windings. The use of slip rings enables the generator to produce a continuous AC output.

70. (415) To locate a misfiring cylinder in the diesel engine, use a screw driver to

Hold the injector follower up or open.

Hold the injector follower down or closed.

Isolate the cylinder from the fuel manifold.

Remove the valve cover and align the piston ring slots.

To locate a misfiring cylinder in a diesel engine, holding the injector follower down or closed with a screwdriver is recommended. This is because by doing so, the fuel supply to the cylinder is cut off, which helps in identifying the misfiring cylinder. When the injector follower is held down or closed, the fuel flow is interrupted, causing a noticeable change in the engine's sound or performance. This method allows for isolating the specific cylinder that is causing the misfire, making it easier to diagnose and fix the issue.

Explanation

To locate a misfiring cylinder in a diesel engine, holding the injector follower down or closed with a screwdriver is recommended. This is because by doing so, the fuel supply to the cylinder is cut off, which helps in identifying the misfiring cylinder. When the injector follower is held down or closed, the fuel flow is interrupted, causing a noticeable change in the engine's sound or performance. This method allows for isolating the specific cylinder that is causing the misfire, making it easier to diagnose and fix the issue.

71. (409) What provides the pressure to operate a pressure injector?

Fuel from the fuel system.

Air from the induction system.

Water from the cooling system.

Oil from the lubricating system.

The pressure to operate a pressure injector is provided by fuel from the fuel system. Pressure injectors are used in engines to deliver fuel into the combustion chamber at high pressure for efficient combustion. Fuel is pressurized by a fuel pump and then injected into the engine cylinders through the pressure injector. This ensures that the fuel is atomized and dispersed evenly, allowing for optimal fuel-air mixture and combustion efficiency.

Explanation

The pressure to operate a pressure injector is provided by fuel from the fuel system. Pressure injectors are used in engines to deliver fuel into the combustion chamber at high pressure for efficient combustion. Fuel is pressurized by a fuel pump and then injected into the engine cylinders through the pressure injector. This ensures that the fuel is atomized and dispersed evenly, allowing for optimal fuel-air mixture and combustion efficiency.

72. (411) Which liquid cooling system component maintains positive pressure within the cooling system, causes the boiling point of the coolant to be higher, and permits the engine to operate at higher temperature without the coolant boiling?

Thermostat.

Water pump.

Radiator cap.

Vacuum valve.

The radiator cap is the component that maintains positive pressure within the cooling system. This pressure raises the boiling point of the coolant, allowing the engine to operate at higher temperatures without the coolant boiling.

Explanation

The radiator cap is the component that maintains positive pressure within the cooling system. This pressure raises the boiling point of the coolant, allowing the engine to operate at higher temperatures without the coolant boiling.

73. (433) When would you perform current or voltage calibrations on the A/M24T–16 load bank?

Never, the load bank automatically performs calibrations.

When input values are outside acceptable tolerances.

Prior to placing the load on test unit.

After load test is complete.

The correct answer is "When input values are outside acceptable tolerances." This means that current or voltage calibrations on the A/M24T-16 load bank should only be performed when the input values deviate from the acceptable range. This ensures that the load bank is accurately measuring and providing the desired current or voltage output. Performing calibrations in such cases helps maintain the reliability and accuracy of the load bank's performance.

Explanation

The correct answer is "When input values are outside acceptable tolerances." This means that current or voltage calibrations on the A/M24T-16 load bank should only be performed when the input values deviate from the acceptable range. This ensures that the load bank is accurately measuring and providing the desired current or voltage output. Performing calibrations in such cases helps maintain the reliability and accuracy of the load bank's performance.

74. (445) In order for the A/M32A–86D to host a transformer rectifier, it must have a

JHAR100B model voltage regulator.

JHAR100C model voltage regulator.

Larger capacity radiator.

K7 contactor installed.

The A/M32A-86D requires a JHAR100B model voltage regulator in order to host a transformer rectifier.

Explanation

The A/M32A-86D requires a JHAR100B model voltage regulator in order to host a transformer rectifier.

75. (401) To change electrical energy to mechanical energy is the purpose of a

Generator.

Converter.

Inverter.

Motor.

A motor is a device that converts electrical energy into mechanical energy. It uses electromagnetic principles to generate a rotating motion, which can be used to power various machines and equipment. Unlike a generator, which converts mechanical energy into electrical energy, a motor performs the opposite function. A converter is a broad term that can refer to various devices used to convert one form of energy into another, but it is not specifically designed to convert electrical energy into mechanical energy. An inverter, on the other hand, is used to convert direct current (DC) into alternating current (AC), and it does not directly convert electrical energy into mechanical energy. Therefore, the correct answer is motor.

Explanation

A motor is a device that converts electrical energy into mechanical energy. It uses electromagnetic principles to generate a rotating motion, which can be used to power various machines and equipment. Unlike a generator, which converts mechanical energy into electrical energy, a motor performs the opposite function. A converter is a broad term that can refer to various devices used to convert one form of energy into another, but it is not specifically designed to convert electrical energy into mechanical energy. An inverter, on the other hand, is used to convert direct current (DC) into alternating current (AC), and it does not directly convert electrical energy into mechanical energy. Therefore, the correct answer is motor.

76. (416) The component that reduces the turbine engine speed for accessories is the

Gear case.

Starter motor.

Tachometer generator.

Multiple centrifugal switch assembly.

The gear case is the component that reduces the turbine engine speed for accessories. It is responsible for transmitting power from the engine to various accessories, such as the generator, hydraulic pump, and air conditioning compressor. By using gears, the gear case can decrease the high rotational speed of the engine to a suitable speed for these accessories to operate efficiently. The starter motor is used to start the engine, the tachometer generator measures the engine speed, and the multiple centrifugal switch assembly is used in electric motors to control their operation.

Explanation

The gear case is the component that reduces the turbine engine speed for accessories. It is responsible for transmitting power from the engine to various accessories, such as the generator, hydraulic pump, and air conditioning compressor. By using gears, the gear case can decrease the high rotational speed of the engine to a suitable speed for these accessories to operate efficiently. The starter motor is used to start the engine, the tachometer generator measures the engine speed, and the multiple centrifugal switch assembly is used in electric motors to control their operation.

77. (419) Lubrication system pressure in the turbine engine is regulated through a

Flow check valve.

Filter bypass valve.

Pressure relief valve.

Temperature regulator.

The correct answer is pressure relief valve. In a turbine engine, the lubrication system pressure needs to be regulated to ensure proper lubrication of the engine components. The pressure relief valve is responsible for maintaining the desired pressure by diverting excess oil flow back to the oil tank when the pressure exceeds the set limit. This helps to prevent damage to the engine due to excessive pressure and ensures that the lubrication system operates effectively. A flow check valve, filter bypass valve, and temperature regulator are not directly involved in regulating the lubrication system pressure.

Explanation

The correct answer is pressure relief valve. In a turbine engine, the lubrication system pressure needs to be regulated to ensure proper lubrication of the engine components. The pressure relief valve is responsible for maintaining the desired pressure by diverting excess oil flow back to the oil tank when the pressure exceeds the set limit. This helps to prevent damage to the engine due to excessive pressure and ensures that the lubrication system operates effectively. A flow check valve, filter bypass valve, and temperature regulator are not directly involved in regulating the lubrication system pressure.

78. (452) What B809A generator set speed control system component produces a frequency pulse train for engine speed reference?

Magnetic pickup.

Engine speed governor.

Speed trim potentiometer.

Speed control potentiometer.

The correct answer is Magnetic pickup. A magnetic pickup is a component of the B809A generator set speed control system that produces a frequency pulse train for the engine speed reference. This pulse train is used by the system to accurately control and maintain the speed of the generator set. The magnetic pickup detects the rotation of a gear or flywheel and converts it into electrical signals, which are then used to adjust the engine speed accordingly.

Explanation

The correct answer is Magnetic pickup. A magnetic pickup is a component of the B809A generator set speed control system that produces a frequency pulse train for the engine speed reference. This pulse train is used by the system to accurately control and maintain the speed of the generator set. The magnetic pickup detects the rotation of a gear or flywheel and converts it into electrical signals, which are then used to adjust the engine speed accordingly.

79. (416) If the drive shaft for the oil pump assembly in a gas turbine engine becomes sheared, what other component is rendered inoperative?

Alternating current (AC) generator.

Tachometer generator.

Starter motor.

Cooling fan.

If the drive shaft for the oil pump assembly in a gas turbine engine becomes sheared, it will cause the tachometer generator to become inoperative. The tachometer generator is connected to the drive shaft and relies on its rotation to generate an electrical signal that is used to measure the engine's speed. Therefore, if the drive shaft is sheared and no longer rotates, the tachometer generator will not be able to generate the necessary signal, rendering it inoperative.

Explanation

If the drive shaft for the oil pump assembly in a gas turbine engine becomes sheared, it will cause the tachometer generator to become inoperative. The tachometer generator is connected to the drive shaft and relies on its rotation to generate an electrical signal that is used to measure the engine's speed. Therefore, if the drive shaft is sheared and no longer rotates, the tachometer generator will not be able to generate the necessary signal, rendering it inoperative.

80. (411) The purpose of the cooling system thermostat is to maintain correct engine

Operating temperature.

Coolant temperature.

System pressure.

Coolant flow.

The cooling system thermostat is responsible for regulating the coolant temperature in the engine. It does this by controlling the flow of coolant through the radiator. When the engine is cold, the thermostat remains closed, preventing coolant from flowing through the radiator and allowing the engine to warm up quickly. Once the engine reaches the optimal operating temperature, the thermostat opens, allowing coolant to circulate and maintain a consistent temperature. Therefore, the purpose of the cooling system thermostat is to maintain the correct coolant temperature in the engine.

Explanation

The cooling system thermostat is responsible for regulating the coolant temperature in the engine. It does this by controlling the flow of coolant through the radiator. When the engine is cold, the thermostat remains closed, preventing coolant from flowing through the radiator and allowing the engine to warm up quickly. Once the engine reaches the optimal operating temperature, the thermostat opens, allowing coolant to circulate and maintain a consistent temperature. Therefore, the purpose of the cooling system thermostat is to maintain the correct coolant temperature in the engine.

81. (439) How is the A/M32A–60A generator output provided to the aircraft?

Alternating current (AC) output cable.

Direct current (DC) output cable.

Single-phase utility outlet.

3-phase utility outlet.

The A/M32A-60A generator output is provided to the aircraft through an alternating current (AC) output cable. This means that the generator produces electricity that alternates in direction, allowing it to power devices that require AC power. The AC output cable allows for the transfer of this electricity from the generator to the aircraft, providing the necessary power for various systems and equipment onboard.

Explanation

The A/M32A-60A generator output is provided to the aircraft through an alternating current (AC) output cable. This means that the generator produces electricity that alternates in direction, allowing it to power devices that require AC power. The AC output cable allows for the transfer of this electricity from the generator to the aircraft, providing the necessary power for various systems and equipment onboard.

82. (420) The load section of the load control valve consists of chambers

1 and 2.

1 and 4.

2 and 3.

3 and 4.

The load section of the load control valve consists of chambers 1 and 2. This means that these two chambers are responsible for controlling the load in the valve. The other options, 1 and 4, 2 and 3, and 3 and 4, are not correct because they do not accurately describe the load section of the valve.

Explanation

The load section of the load control valve consists of chambers 1 and 2. This means that these two chambers are responsible for controlling the load in the valve. The other options, 1 and 4, 2 and 3, and 3 and 4, are not correct because they do not accurately describe the load section of the valve.

83. (431) How many panel assemblies are the electrical and unit under test (UUT) interconnection panel assemblies divided into?

Seven.

Four.

Five.

Six.

The electrical and unit under test (UUT) interconnection panel assemblies are divided into seven different panel assemblies.

Explanation

The electrical and unit under test (UUT) interconnection panel assemblies are divided into seven different panel assemblies.

84. (446) As soon as the engine of the A/M32A–86D generator starts, you should

Allow the engine to idle for 10 minutes before loading.

Set the meter selector switch on the ammeter and then check the oil pressure.

Ensure the protective circuit indicating light is ON and check the oil pressure.

Press the protective system test switch, then the protective system reset switch.

After starting the engine of the A/M32A-86D generator, it is important to ensure that the protective circuit indicating light is ON and check the oil pressure. This is necessary to ensure that the generator is functioning properly and that there are no issues with the protective circuit or the oil pressure. By checking these indicators, any potential problems can be identified and addressed before loading the generator.

Explanation

After starting the engine of the A/M32A-86D generator, it is important to ensure that the protective circuit indicating light is ON and check the oil pressure. This is necessary to ensure that the generator is functioning properly and that there are no issues with the protective circuit or the oil pressure. By checking these indicators, any potential problems can be identified and addressed before loading the generator.

85. (445) In what position must the A/M32A–86D line-drop compensation switch be in when adjusting voltage regulation?

ON.

OFF.

ADJUST.

REGULATOR.

The A/M32A-86D line-drop compensation switch must be in the ON position when adjusting voltage regulation. This suggests that the switch plays a role in compensating for line-drop, which refers to the decrease in voltage that occurs as electricity flows through power lines. By keeping the switch ON, the voltage regulation can be adjusted effectively to account for this line-drop and ensure a stable and consistent voltage output.

Explanation

The A/M32A-86D line-drop compensation switch must be in the ON position when adjusting voltage regulation. This suggests that the switch plays a role in compensating for line-drop, which refers to the decrease in voltage that occurs as electricity flows through power lines. By keeping the switch ON, the voltage regulation can be adjusted effectively to account for this line-drop and ensure a stable and consistent voltage output.

86. (418) What types of inputs are used to control the fuel solenoid for the delivery of fuel to the atomizer within the turbine engine fuel system?

Oil pressure and electrical.

Oil pressure and cooling.

Air and electrical.

Air and cooling.

Oil pressure and electrical inputs are used to control the fuel solenoid for the delivery of fuel to the atomizer within the turbine engine fuel system. Oil pressure is necessary to ensure that the solenoid is activated and allows fuel to flow to the atomizer. Electrical inputs are used to control the opening and closing of the solenoid, regulating the fuel flow. Therefore, both oil pressure and electrical inputs are essential for the proper functioning of the fuel solenoid in delivering fuel to the atomizer.

Explanation

Oil pressure and electrical inputs are used to control the fuel solenoid for the delivery of fuel to the atomizer within the turbine engine fuel system. Oil pressure is necessary to ensure that the solenoid is activated and allows fuel to flow to the atomizer. Electrical inputs are used to control the opening and closing of the solenoid, regulating the fuel flow. Therefore, both oil pressure and electrical inputs are essential for the proper functioning of the fuel solenoid in delivering fuel to the atomizer.

87. (453) What B809A generator set engine safety circuit incorporates a seven-second time delay before activation?

Low fuel fault.

Overspeed fault.

Low lube pressure.

Coolant temperature.

The correct answer is Low lube pressure. The B809A generator set engine safety circuit incorporates a seven-second time delay before activation in case of low lube pressure. This delay allows the engine to stabilize and ensures that the low lube pressure is not a temporary fluctuation before activating the safety circuit. This feature helps to prevent false alarms and unnecessary shutdowns of the generator set.

Explanation

The correct answer is Low lube pressure. The B809A generator set engine safety circuit incorporates a seven-second time delay before activation in case of low lube pressure. This delay allows the engine to stabilize and ensures that the low lube pressure is not a temporary fluctuation before activating the safety circuit. This feature helps to prevent false alarms and unnecessary shutdowns of the generator set.

88. (427) What result is achieved by replacing the single rotating conductor of a simple direct current (DC) generator with many coils of wire wound on the same shaft?

Increased output and almost constant alternating current (AC).

Increased output and almost constant DC.

Decreased current and constant AC.

Decreased current and constant DC.

By replacing the single rotating conductor with many coils of wire wound on the same shaft, the output of the DC generator is increased. This is because each coil contributes to the overall output, resulting in a higher output power. Additionally, the use of multiple coils helps to smooth out the output, resulting in almost constant DC current. This is because the coils are arranged in a way that the variations in the current produced by each coil cancel each other out, leading to a more stable and constant DC output.

Explanation

By replacing the single rotating conductor with many coils of wire wound on the same shaft, the output of the DC generator is increased. This is because each coil contributes to the overall output, resulting in a higher output power. Additionally, the use of multiple coils helps to smooth out the output, resulting in almost constant DC current. This is because the coils are arranged in a way that the variations in the current produced by each coil cancel each other out, leading to a more stable and constant DC output.

89. (451) What problem is indicated by a flashing red over/undervoltage indicator light on the EPU–6/E frequency converter?

Out-of-phase relationship.

Output overvoltage.

Loss-of-input phase.

Input undervoltage.

A flashing red over/undervoltage indicator light on the EPU-6/E frequency converter indicates an input undervoltage problem. This means that the voltage supplied to the converter is lower than the required level, which can lead to improper functioning or even damage to the equipment.

Explanation

A flashing red over/undervoltage indicator light on the EPU-6/E frequency converter indicates an input undervoltage problem. This means that the voltage supplied to the converter is lower than the required level, which can lead to improper functioning or even damage to the equipment.

90. (406) During an inspection of a direct current (DC) motor, check the brushes for

Pitting.

Seating.

Coloration.

Brittleness.

During an inspection of a DC motor, it is important to check the brushes for seating. Seating refers to the proper alignment and contact of the brushes with the commutator. If the brushes are not seated correctly, it can result in poor electrical contact, leading to reduced motor performance and efficiency. Therefore, checking the brushes for seating ensures that they are properly aligned and making good contact with the commutator, which is crucial for the motor's optimal functioning.

Explanation

During an inspection of a DC motor, it is important to check the brushes for seating. Seating refers to the proper alignment and contact of the brushes with the commutator. If the brushes are not seated correctly, it can result in poor electrical contact, leading to reduced motor performance and efficiency. Therefore, checking the brushes for seating ensures that they are properly aligned and making good contact with the commutator, which is crucial for the motor's optimal functioning.

91. (448) What position must the alarm switch on the EPU–6/E frequency converter be placed prior to operation?

ON.

OFF.

ACTIVATE.

INACTIVE.

The alarm switch on the EPU-6/E frequency converter must be placed in the ACTIVATE position prior to operation. This suggests that the alarm function needs to be enabled or turned on before the converter can be used.

Explanation

The alarm switch on the EPU-6/E frequency converter must be placed in the ACTIVATE position prior to operation. This suggests that the alarm function needs to be enabled or turned on before the converter can be used.

92. (439) The static frequency control of the A/M32A–60A controls engine speed by sensing

A phase frequency.

C phase frequency.

E and F pin frequency.

Trim control motor frequency.

The correct answer is A phase frequency. The A/M32A-60A controls engine speed by sensing the phase frequency. This means that it measures the frequency of the electrical phase in order to adjust and control the engine speed. The phase frequency is a crucial parameter in determining the speed of the engine, and by sensing it, the A/M32A-60A can make necessary adjustments to maintain the desired engine speed.

Explanation

The correct answer is A phase frequency. The A/M32A-60A controls engine speed by sensing the phase frequency. This means that it measures the frequency of the electrical phase in order to adjust and control the engine speed. The phase frequency is a crucial parameter in determining the speed of the engine, and by sensing it, the A/M32A-60A can make necessary adjustments to maintain the desired engine speed.

93. (437) On the A/M32A–60A, which chambers of the load control valve work together to ensure the butterfly valve opens smoothly?

1 and 2.

2 and 3.

1 and 3.

2 and 4.

The correct answer is 2 and 4. The load control valve on the A/M32A-60A has four chambers. Chambers 2 and 4 work together to ensure the butterfly valve opens smoothly.

Explanation

The correct answer is 2 and 4. The load control valve on the A/M32A-60A has four chambers. Chambers 2 and 4 work together to ensure the butterfly valve opens smoothly.

94. (418) The two pressure controls in the fuel pump and control unit of the turbine engine are the

Governor and pneumatic control device.

Acceleration limiter valve and governor.

Fuel solenoid valve and pneumatic control device.

Acceleration limiter valve and fuel solenoid valve.

The two pressure controls in the fuel pump and control unit of the turbine engine are the acceleration limiter valve and governor. These controls work together to regulate the fuel pressure and ensure that it is maintained within safe limits. The acceleration limiter valve limits the rate at which the fuel pressure can increase, preventing sudden surges that could damage the engine. The governor, on the other hand, adjusts the fuel flow to maintain a constant speed and prevent overspeeding. Together, these controls help to maintain the proper fuel pressure and ensure the safe and efficient operation of the turbine engine.

Explanation

The two pressure controls in the fuel pump and control unit of the turbine engine are the acceleration limiter valve and governor. These controls work together to regulate the fuel pressure and ensure that it is maintained within safe limits. The acceleration limiter valve limits the rate at which the fuel pressure can increase, preventing sudden surges that could damage the engine. The governor, on the other hand, adjusts the fuel flow to maintain a constant speed and prevent overspeeding. Together, these controls help to maintain the proper fuel pressure and ensure the safe and efficient operation of the turbine engine.

95. (451) If during operation of the EPU–6/E frequency converter the operator determines that one phase voltage is lower than the other two phases, what could be the likely cause?

Malfunctioning transistor.

Burnt control transformer fuse.

Loose push-on connector on the output filter capacitor.

Improper silicon controlled rectifier (SCR) firing adjustment.

A likely cause for one phase voltage being lower than the other two phases during operation of the EPU-6/E frequency converter could be a loose push-on connector on the output filter capacitor. This loose connection can result in a poor electrical connection, leading to reduced voltage output on that particular phase.

Explanation

A likely cause for one phase voltage being lower than the other two phases during operation of the EPU-6/E frequency converter could be a loose push-on connector on the output filter capacitor. This loose connection can result in a poor electrical connection, leading to reduced voltage output on that particular phase.

96. (444) What component of the A/M32A–86D deactivates the time delay switch, S55?

Oil pressure switch, S46.

Oil pressure switch, S53.

Fuel oil pressure switch, S48.

Engine high temperature switch, S49.

The oil pressure switch, S46, is the component of the A/M32A-86D that deactivates the time delay switch, S55. This means that when the oil pressure reaches a certain level, the oil pressure switch will send a signal to deactivate the time delay switch.

Explanation

The oil pressure switch, S46, is the component of the A/M32A-86D that deactivates the time delay switch, S55. This means that when the oil pressure reaches a certain level, the oil pressure switch will send a signal to deactivate the time delay switch.

97. (427) A commutator changes alternating current (AC) to direct current (DC)

Chemically.

Inductively.

Magnetically.

Mechanically.

A commutator is a mechanical device used in electric motors and generators to convert alternating current (AC) to direct current (DC). It consists of a rotating cylinder with metal segments and brushes that make contact with the segments. As the cylinder rotates, the brushes switch the direction of the current, resulting in the conversion of AC to DC. Therefore, the commutator changes the current mechanically, not chemically, inductively, or magnetically.

Explanation

A commutator is a mechanical device used in electric motors and generators to convert alternating current (AC) to direct current (DC). It consists of a rotating cylinder with metal segments and brushes that make contact with the segments. As the cylinder rotates, the brushes switch the direction of the current, resulting in the conversion of AC to DC. Therefore, the commutator changes the current mechanically, not chemically, inductively, or magnetically.

98. (437) What component charges the batteries on the A/M32A–60A generator set?

Alternating current (AC) generator.

Direct current (DC) zenor diode.

AC-powered battery charger.

Transformer rectifier.

The transformer rectifier is the component that charges the batteries on the A/M32A-60A generator set. A transformer is used to step up or step down the voltage, and a rectifier converts the alternating current (AC) to direct current (DC). This DC current is then used to charge the batteries.

Explanation

The transformer rectifier is the component that charges the batteries on the A/M32A-60A generator set. A transformer is used to step up or step down the voltage, and a rectifier converts the alternating current (AC) to direct current (DC). This DC current is then used to charge the batteries.

99. (447) To test the load contactor relay K1, using test probes, in what position must the automatic-manual voltage control switch be placed?

AUTOMATIC.

MANUAL.

TEST.

OFF.

To test the load contactor relay K1, the automatic-manual voltage control switch must be placed in the AUTOMATIC position. This is because the load contactor relay is typically controlled by the automatic voltage control system, so to accurately test its functionality, it should be tested in the same mode in which it operates. Placing the switch in the AUTOMATIC position ensures that the relay is being tested under normal operating conditions.

Explanation

To test the load contactor relay K1, the automatic-manual voltage control switch must be placed in the AUTOMATIC position. This is because the load contactor relay is typically controlled by the automatic voltage control system, so to accurately test its functionality, it should be tested in the same mode in which it operates. Placing the switch in the AUTOMATIC position ensures that the relay is being tested under normal operating conditions.

100. (418) Crack pressure is defined as the amount of

Air pressure that is required to overcome fuel pressure.

Air pressure that is required to overcome spring tension.

Fuel pressure that is required to overcome spring tension.

Fuel pressure that is required to overcome air and spring pressure.

Crack pressure is the amount of pressure required to overcome the force of a spring and allow a fluid or gas to flow through a valve or opening. In this case, the crack pressure is specifically referring to the fuel pressure that is needed to overcome the tension of a spring in order for fuel to flow.

Explanation

Crack pressure is the amount of pressure required to overcome the force of a spring and allow a fluid or gas to flow through a valve or opening. In this case, the crack pressure is specifically referring to the fuel pressure that is needed to overcome the tension of a spring in order for fuel to flow.

101. (438) The control components of the turbine start circuit on the A/M32A–60A are energized by the

Start switch, S7.

Starter relay, K8.

Master switch, S5.

Control relay, K17.

The correct answer is the start switch, S7. This means that the control components of the turbine start circuit on the A/M32A-60A are energized by the start switch, S7.

Explanation

The correct answer is the start switch, S7. This means that the control components of the turbine start circuit on the A/M32A-60A are energized by the start switch, S7.

102. (409) What controls the amount of fuel injected when constant-stroke fuel injection pumps are used?

Injectors.

Control rack.

Delivery valve.

Revolving disk.

When constant-stroke fuel injection pumps are used, the amount of fuel injected is controlled by the control rack. The control rack is responsible for determining the position of the fuel rack in the pump, which in turn regulates the amount of fuel that is injected into the engine cylinders. By adjusting the position of the control rack, the fuel delivery can be increased or decreased, allowing for precise control of the fuel injection process.

Explanation

When constant-stroke fuel injection pumps are used, the amount of fuel injected is controlled by the control rack. The control rack is responsible for determining the position of the fuel rack in the pump, which in turn regulates the amount of fuel that is injected into the engine cylinders. By adjusting the position of the control rack, the fuel delivery can be increased or decreased, allowing for precise control of the fuel injection process.

103. (453) What contacts on the annunciator card of the B809A generator set control the alternating current (AC) power input to the voltage regulator?

Engine fault.

Regulator fault.

Generator fault.

Contactor fault.

The contacts on the annunciator card of the B809A generator set control the AC power input to the voltage regulator. If there is a fault in the generator, it can affect the power input to the voltage regulator, causing issues with the generator's performance. Therefore, the correct answer is "Generator fault."

Explanation

The contacts on the annunciator card of the B809A generator set control the AC power input to the voltage regulator. If there is a fault in the generator, it can affect the power input to the voltage regulator, causing issues with the generator's performance. Therefore, the correct answer is "Generator fault."

104. (404) The three-phase induction motor does not require

Slip.

A rotor.

A stator.

A starting device.

The three-phase induction motor requires slip in order to generate torque. Slip is the difference between the synchronous speed of the rotating magnetic field and the actual speed of the rotor. This difference creates the necessary relative motion between the stator and rotor, allowing the motor to produce torque. Without slip, the motor would not be able to start or operate. Therefore, slip is necessary for the functioning of a three-phase induction motor.

Explanation

The three-phase induction motor requires slip in order to generate torque. Slip is the difference between the synchronous speed of the rotating magnetic field and the actual speed of the rotor. This difference creates the necessary relative motion between the stator and rotor, allowing the motor to produce torque. Without slip, the motor would not be able to start or operate. Therefore, slip is necessary for the functioning of a three-phase induction motor.

105. (418) Which turbine engine fuel system component is normally closed and is energized open when the engine builds up sufficient oil?

Governor.

Oil shutoff valve.

Boost pump valve.

Fuel shutoff solenoid valve.

The fuel shutoff solenoid valve is normally closed and is energized open when the engine builds up sufficient oil. This valve is responsible for controlling the flow of fuel to the engine. When the engine has enough oil pressure, the solenoid valve opens, allowing fuel to flow into the engine. This ensures that the engine only receives fuel when it is ready to start and prevents any potential damage that could occur if fuel were to enter the engine without sufficient oil pressure. The other options, such as the governor, oil shutoff valve, and boost pump valve, are not directly related to controlling the flow of fuel in the same way as the fuel shutoff solenoid valve.

Explanation

The fuel shutoff solenoid valve is normally closed and is energized open when the engine builds up sufficient oil. This valve is responsible for controlling the flow of fuel to the engine. When the engine has enough oil pressure, the solenoid valve opens, allowing fuel to flow into the engine. This ensures that the engine only receives fuel when it is ready to start and prevents any potential damage that could occur if fuel were to enter the engine without sufficient oil pressure. The other options, such as the governor, oil shutoff valve, and boost pump valve, are not directly related to controlling the flow of fuel in the same way as the fuel shutoff solenoid valve.

106. (429) The self-excited alternating current (AC) generator provides its own field current from a built-in

Direct current (DC) generator.

Selenium rectifier.

Battery source.

Regulator.

The correct answer is direct current (DC) generator. A self-excited AC generator generates its own field current from a built-in DC generator. This DC generator produces the necessary current to create a magnetic field in the rotor, which induces the AC current in the stator windings. By using a DC generator, the AC generator can maintain its own field current without relying on an external power source such as a battery or regulator.

Explanation

The correct answer is direct current (DC) generator. A self-excited AC generator generates its own field current from a built-in DC generator. This DC generator produces the necessary current to create a magnetic field in the rotor, which induces the AC current in the stator windings. By using a DC generator, the AC generator can maintain its own field current without relying on an external power source such as a battery or regulator.

107. (438) The component of the A/M32A–60A that stops the engine when the fuel supply gets low is the fuel

Level relay, K4.

Level switch, S20.

Level control relay, K26.

Low-level lockout switch, S18.

The component of the A/M32A-60A that stops the engine when the fuel supply gets low is the fuel level relay, K4.

Explanation

The component of the A/M32A-60A that stops the engine when the fuel supply gets low is the fuel level relay, K4.

108. (449) What component on the EPU–6/E frequency converter controls the timing and firing of the silicon controlled rectifier (SCR)?

Analog board.

Control transformer.

SCR voltage regulator.

Phase sequence transformer.

The phase sequence transformer on the EPU-6/E frequency converter controls the timing and firing of the silicon controlled rectifier (SCR). This component ensures that the SCR is triggered at the correct phase and sequence, allowing the converter to operate efficiently and accurately. The phase sequence transformer plays a crucial role in maintaining the proper functioning of the SCR and ensuring the smooth operation of the frequency converter.

Explanation

The phase sequence transformer on the EPU-6/E frequency converter controls the timing and firing of the silicon controlled rectifier (SCR). This component ensures that the SCR is triggered at the correct phase and sequence, allowing the converter to operate efficiently and accurately. The phase sequence transformer plays a crucial role in maintaining the proper functioning of the SCR and ensuring the smooth operation of the frequency converter.

109. (429) In the brushless alternating current (AC) generator, what provides necessary excitation current?

Main generator.

Exciter generator.

Armature windings.

Permanent magnet generator.

The necessary excitation current in a brushless AC generator is provided by the permanent magnet generator. This generator uses permanent magnets to create a magnetic field, which then induces a current in the armature windings of the main generator. This current is necessary for the generator to produce electricity.

Explanation

The necessary excitation current in a brushless AC generator is provided by the permanent magnet generator. This generator uses permanent magnets to create a magnetic field, which then induces a current in the armature windings of the main generator. This current is necessary for the generator to produce electricity.

110. (439) When is 28 volts direct current (VDC) applied to the E pin of the alternating current (AC) cable?

Never.

At all times.

When the AC cable switch is in the GEN position.

When the AC cable switch is in the ACFT position.

When the AC cable switch is in the GEN position, 28 volts direct current (VDC) is applied to the E pin of the alternating current (AC) cable. This means that the E pin receives power only when the switch is in this specific position.

Explanation

When the AC cable switch is in the GEN position, 28 volts direct current (VDC) is applied to the E pin of the alternating current (AC) cable. This means that the E pin receives power only when the switch is in this specific position.

111. (430) What board of the A/M24T–16 load bank conditions all input signals from different elements like AC current transformers, DC current shunts, AC and DC voltages?

DO Isolation and Power Tap Selection Board (E4754A).

Analog Signal Conditioning Board (E414A).

Micro-Controller Board (E416A).

Signal Junction Board (E434A).

The Analog Signal Conditioning Board (E414A) is the correct answer because it is responsible for conditioning and processing all input signals from different elements like AC current transformers, DC current shunts, AC and DC voltages. This board ensures that the signals are properly converted, filtered, and amplified before being sent to the micro-controller for further processing.

Explanation

The Analog Signal Conditioning Board (E414A) is the correct answer because it is responsible for conditioning and processing all input signals from different elements like AC current transformers, DC current shunts, AC and DC voltages. This board ensures that the signals are properly converted, filtered, and amplified before being sent to the micro-controller for further processing.

112. (410) What is also reduced when a lubricant reduces friction?

Dirt and metal particles.

Heat, wear, and resistance.

Blow-by and loss of power.

Dilution and increases cohesion.

When a lubricant reduces friction, it also reduces the presence of dirt and metal particles. This is because the lubricant forms a protective layer between moving parts, preventing them from coming into direct contact and causing wear. As a result, the friction is reduced, and any dirt or metal particles that may have been present are less likely to be dislodged or generated during the movement of the parts.

Explanation

When a lubricant reduces friction, it also reduces the presence of dirt and metal particles. This is because the lubricant forms a protective layer between moving parts, preventing them from coming into direct contact and causing wear. As a result, the friction is reduced, and any dirt or metal particles that may have been present are less likely to be dislodged or generated during the movement of the parts.

113. (428) Control of the output voltage of an alternating current (AC) generator is accomplished by varying the

Speed of rotation.

Size of the armature.

Amount of field current.

Size of the field windings.

The control of the output voltage of an AC generator is achieved by adjusting the amount of field current. The field current creates a magnetic field that interacts with the rotating armature, inducing an AC voltage. By increasing or decreasing the field current, the strength of the magnetic field can be modified, resulting in a corresponding change in the output voltage. Therefore, by varying the amount of field current, the output voltage of the AC generator can be controlled.

Explanation

The control of the output voltage of an AC generator is achieved by adjusting the amount of field current. The field current creates a magnetic field that interacts with the rotating armature, inducing an AC voltage. By increasing or decreasing the field current, the strength of the magnetic field can be modified, resulting in a corresponding change in the output voltage. Therefore, by varying the amount of field current, the output voltage of the AC generator can be controlled.

114. (425) Which could cause the butterfly valve to oscillate (continually open and close)?

Load valve.

Hose relief valve.

Rate adjustment screw.

Pneumatic load thermostat.

A pneumatic load thermostat could cause the butterfly valve to oscillate (continually open and close) because it regulates the air pressure in the system based on the load demand. If the load demand fluctuates, the pneumatic load thermostat will adjust the air pressure accordingly, which can cause the butterfly valve to open and close rapidly in response to these changes.

Explanation

A pneumatic load thermostat could cause the butterfly valve to oscillate (continually open and close) because it regulates the air pressure in the system based on the load demand. If the load demand fluctuates, the pneumatic load thermostat will adjust the air pressure accordingly, which can cause the butterfly valve to open and close rapidly in response to these changes.

115. (417) During gas turbine engine operation, the air is accelerated by the

Diffusers.

Exducers.

Impellers.

Deswirl ring.

During gas turbine engine operation, the air needs to be accelerated to increase its velocity before entering the combustion chamber. This is achieved by using diffusers, which are a type of component that slows down the airflow while increasing its pressure. Diffusers are designed to convert the kinetic energy of the fast-moving air into pressure energy, allowing for efficient combustion and overall engine performance.

Explanation

During gas turbine engine operation, the air needs to be accelerated to increase its velocity before entering the combustion chamber. This is achieved by using diffusers, which are a type of component that slows down the airflow while increasing its pressure. Diffusers are designed to convert the kinetic energy of the fast-moving air into pressure energy, allowing for efficient combustion and overall engine performance.

116. (420) In the turbine engine, what prevents rupture of the rate diaphragm?

Adjustment screw.

A actuator regulator.

Rate metering valve.

Rate diaphragm return spring.

The adjustment screw prevents rupture of the rate diaphragm in a turbine engine. It allows for the adjustment of the rate diaphragm, which controls the flow of fuel into the engine. By adjusting the screw, the operator can regulate the fuel flow and prevent excessive pressure that could lead to rupture of the diaphragm.

Explanation

The adjustment screw prevents rupture of the rate diaphragm in a turbine engine. It allows for the adjustment of the rate diaphragm, which controls the flow of fuel into the engine. By adjusting the screw, the operator can regulate the fuel flow and prevent excessive pressure that could lead to rupture of the diaphragm.

117. (429) How does rectification take place in a brushless alternating current (AC) generator?

Mechanically.

Magnetically.

Electrically.

Chemically.

Rectification in a brushless AC generator takes place electrically. In a brushless generator, the rectification process is achieved through the use of electronic components such as diodes. These diodes convert the alternating current produced by the generator into direct current by allowing the current to flow in only one direction. This conversion is essential for many applications that require a steady and consistent flow of current, such as powering electronic devices or charging batteries.

Explanation

Rectification in a brushless AC generator takes place electrically. In a brushless generator, the rectification process is achieved through the use of electronic components such as diodes. These diodes convert the alternating current produced by the generator into direct current by allowing the current to flow in only one direction. This conversion is essential for many applications that require a steady and consistent flow of current, such as powering electronic devices or charging batteries.

118. (454) During high-voltage operation of the B809A generator set, what action occurs to prevent the direct current (DC) contactors from closing?

High sense relay (HSR) energizes.

Interlock (INT) relay energizes.

INT relay deenergizes.

HSR deenergizes.

During high-voltage operation of the B809A generator set, the action that occurs to prevent the direct current (DC) contactors from closing is that the High Sense Relay (HSR) deenergizes.

Explanation

During high-voltage operation of the B809A generator set, the action that occurs to prevent the direct current (DC) contactors from closing is that the High Sense Relay (HSR) deenergizes.

119. (429) In a brushless alternating current (AC) generator, the exciter armature and field windings are coupled by

Brushes.

Slip rings.

A commutator.

A magnetic field.

In a brushless AC generator, the exciter armature and field windings are coupled by a magnetic field. This means that there are no brushes, slip rings, or a commutator involved in the coupling process. The magnetic field is used to transfer the electrical energy between the exciter armature and the field windings, allowing for the generation of alternating current without the need for physical contact or mechanical components.

Explanation

In a brushless AC generator, the exciter armature and field windings are coupled by a magnetic field. This means that there are no brushes, slip rings, or a commutator involved in the coupling process. The magnetic field is used to transfer the electrical energy between the exciter armature and the field windings, allowing for the generation of alternating current without the need for physical contact or mechanical components.

120. (452) What component on the B809A generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders?

Injector pump.

Transfer pump.

Injector nozzles.

Throttle actuator.

The injector pump is responsible for distributing and delivering an accurate amount of fuel to the engine cylinders in the B809A generator set fuel system. It ensures that the correct amount of fuel is injected into each cylinder at the right time, allowing for efficient combustion and optimal engine performance. The transfer pump, on the other hand, is responsible for transferring fuel from the fuel tank to the injector pump. Injector nozzles are responsible for atomizing the fuel and injecting it into the combustion chamber, while the throttle actuator controls the throttle valve to regulate the engine's speed and power output.

Explanation

The injector pump is responsible for distributing and delivering an accurate amount of fuel to the engine cylinders in the B809A generator set fuel system. It ensures that the correct amount of fuel is injected into each cylinder at the right time, allowing for efficient combustion and optimal engine performance. The transfer pump, on the other hand, is responsible for transferring fuel from the fuel tank to the injector pump. Injector nozzles are responsible for atomizing the fuel and injecting it into the combustion chamber, while the throttle actuator controls the throttle valve to regulate the engine's speed and power output.

121. (448) What component provides 525 volts alternating current (VAC) to the control transformer of the EPU–6/E frequency converter?

Input auto transformer.

Output auto transformer.

Input phase sequence transformer.

Output phase sequence transformer.

The correct answer is the input auto transformer. The input auto transformer is responsible for providing 525 volts alternating current (VAC) to the control transformer of the EPU-6/E frequency converter. It is an essential component in the system that helps regulate the voltage and ensure proper functioning of the control transformer.

Explanation

The correct answer is the input auto transformer. The input auto transformer is responsible for providing 525 volts alternating current (VAC) to the control transformer of the EPU-6/E frequency converter. It is an essential component in the system that helps regulate the voltage and ensure proper functioning of the control transformer.

122. (438) What component of the A/M32A–60A generator must be energized to begin movement of the dual-ball selector valve?

Bleed air switch, S10.

95 percent switch, S14.

Bleed air solenoid valve, L2.

Pneumatic control device, L5.

The correct answer is Bleed air solenoid valve, L2. The bleed air solenoid valve, L2, must be energized to begin movement of the dual-ball selector valve in the A/M32A-60A generator. This valve controls the flow of bleed air, which is used to start the generator.

Explanation

The correct answer is Bleed air solenoid valve, L2. The bleed air solenoid valve, L2, must be energized to begin movement of the dual-ball selector valve in the A/M32A-60A generator. This valve controls the flow of bleed air, which is used to start the generator.

123. (429) In a brushless alternating current (AC) generator, what provides the field current for the main AC generator section?

Permanent magnet generator.

Exciter generator.

Main generator.

Battery.

In a brushless AC generator, the field current for the main AC generator section is provided by a battery. This is because the brushless design eliminates the need for brushes and slip rings to transfer power to the rotor, and instead uses a solid-state device called an exciter to control the field current. The exciter is powered by a battery, which supplies the necessary electrical energy to create a magnetic field in the rotor, thus generating the alternating current.

Explanation

In a brushless AC generator, the field current for the main AC generator section is provided by a battery. This is because the brushless design eliminates the need for brushes and slip rings to transfer power to the rotor, and instead uses a solid-state device called an exciter to control the field current. The exciter is powered by a battery, which supplies the necessary electrical energy to create a magnetic field in the rotor, thus generating the alternating current.