Alternating Current (Ac) Generator Quiz

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  • 1/123 Questions

    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
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About This Quiz

This quiz on Electric Motors tests understanding of key concepts like motor function, torque, and induction motor mechanics. It assesses practical knowledge crucial for learners in physics and engineering, focusing on conversion of energy types and motor dynamics.

Alternating Current (Ac) Generator Quiz - Quiz

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  • 2. 

    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

    Correct Answer
    A. Three-phase generator
    Explanation
    A three-phase generator is capable of supporting three different loads simultaneously because it produces three separate alternating currents that are 120 degrees out of phase with each other. This allows for a balanced and efficient distribution of power to multiple loads. Each load can be connected to one of the three phases, ensuring a steady and reliable power supply. In contrast, a single-phase generator can only support one load at a time, while a two-phase generator can support two loads but with less efficiency and balance. Therefore, a three-phase generator is the most suitable option for supporting multiple loads simultaneously.

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  • 3. 

    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

    Correct Answer
    A. Ensure the protective circuit indicating light is ON and check the oil pressure
  • 4. 

    To Change electrical energy to mechanical energy is the purpose of a

    • Generator

    • Converter

    • Inverter

    • Motor

    Correct Answer
    A. Motor
    Explanation
    A motor is a device that converts electrical energy into mechanical energy. It does this by using the principle of electromagnetism, where the interaction between electric current and magnetic fields produces a rotational motion. Unlike a generator, which converts mechanical energy into electrical energy, a motor operates in the opposite direction. Therefore, a motor is the correct answer for the given question.

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  • 5. 

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

    • Pitting

    • Seating

    • Coloration

    • Brittleness

    Correct Answer
    A. Seating
    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, which is essential for the efficient operation of the motor. If the brushes are not properly seated, it can lead to poor electrical contact, increased friction, and reduced motor performance. Therefore, checking the seating of the brushes ensures that they are in the correct position and making good contact with the commutator.

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  • 6. 

    Perform an operational check of the unit

    • At the last minute

    • With the defective part removed

    • Before final assembly of the enclosure

    • As soon as you replace the defective part

    Correct Answer
    A. Before final assembly of the enclosure
    Explanation
    Performing an operational check of the unit before final assembly of the enclosure ensures that the unit is functioning properly and all components are in working order. This step allows for any defects or issues to be identified and resolved before the final assembly, reducing the risk of having to disassemble the enclosure again. By removing the defective part before the operational check, it ensures that the check is accurate and any issues are not caused by the defective part.

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  • 7. 

    The purpose of the cooling system thermostat is to maintain correct engine

    • Operating temperature

    • Coolant temperature

    • System pressure

    • Coolant flow

    Correct Answer
    A. Operating temperature
    Explanation
    The purpose of the cooling system thermostat is to maintain the correct operating temperature of the engine. This is important because the engine operates most efficiently and effectively within a specific temperature range. The thermostat helps regulate the flow of coolant through the engine, allowing it to warm up quickly and then maintain a consistent temperature. This prevents the engine from overheating or running too cold, which can cause damage and reduce performance.

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  • 8. 

    During operation of a turbine engine, fuel and air are mixed and ignited in the

    • Fuel atomizer

    • Combustor can

    • Mixer assembly

    • Plenum chamber

    Correct Answer
    A. Combustor can
    Explanation
    During the operation of a turbine engine, fuel and air are mixed and ignited in the combustor can. The combustor can is specifically designed to contain the combustion process and allow for efficient fuel burning. It is responsible for providing the necessary conditions for the fuel and air mixture to ignite and produce high-temperature gases, which then flow through the turbine and generate thrust. The combustor can is a critical component in the engine, as it ensures the proper combustion of fuel and air, leading to the efficient operation of the turbine engine.

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  • 9. 

    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

    Correct Answer
    A. Entire assembly
    Explanation
    If no oil pressure is available from the main oil pump assembly on the gas turbine compressor (GTC), the most appropriate course of action would be to replace the entire assembly. This is because if there is no oil pressure, it indicates a failure or malfunction in the pump assembly as a whole, rather than a specific component such as the flow check valve or filter bypass relief valve. By replacing the entire assembly, it ensures that all components are functioning properly and can restore the necessary oil pressure for the GTC.

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  • 10. 

    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)

    Correct Answer
    A. Strength of the magnetic field
    Explanation
    To increase the output of a generator, the strength of the magnetic field needs to be increased. This is because the generator works based on the principle of electromagnetic induction, where a changing magnetic field induces an electric current in a conductor. By increasing the strength of the magnetic field, more lines of magnetic flux will pass through the conductor, resulting in a higher induced current and therefore increasing the output of the generator.

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  • 11. 

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

    • Mechanically

    • Magnetically

    • Electrically

    • Chemically

    Correct Answer
    A. Electrically
    Explanation
    Rectification in a brushless AC generator takes place electrically. In a brushless generator, the rotor has permanent magnets instead of electromagnets, and the stator has a set of stationary windings. The AC voltage generated in the stator windings is then converted to DC voltage through electronic circuits, such as diodes or transistors. This process of converting AC to DC is known as rectification. By rectifying the voltage, the generator can produce a steady and constant DC output, which is suitable for various applications like charging batteries or powering electronic devices.

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  • 12. 

    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

    Correct Answer
    A. AC and DC 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 evaluate the functionality and performance of power supplies that provide either alternating current or direct current. The test set is versatile and can be used for a wide range of power supply testing applications, making it a valuable tool for troubleshooting and maintenance purposes.

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  • 13. 

    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

    Correct Answer
    A. Cooling fans blowing not into prevailing wind
    Explanation
    The correct answer is "Cooling fans blowing not into prevailing wind". This is because if the cooling fans blow into the prevailing wind, it may cause the load bank to overheat and not function properly. By positioning the cooling fans in the opposite direction of the prevailing wind, the load bank can effectively cool down and operate efficiently.

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  • 14. 

    The component that reduces the turbine engine speed fro accessories is the

    • Gear case

    • Starter motor

    • Tachometer generator

    • Multiple centrifugal switch assembly

    Correct Answer
    A. Gear case
    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 generators, pumps, and fans, at the appropriate speed. By using gears and other mechanical components, the gear case ensures that the accessories operate at the correct speed for optimal performance and efficiency.

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  • 15. 

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

    • Oil pressure solenoid

    • Oil pressure switch

    • Oil drain switch

    • Ignition coil

    Correct Answer
    A. Oil pressure switch
    Explanation
    The oil pressure switch is responsible for preventing gas turbine compressor (GTC) operation with insufficient oil pressure. This switch acts as a safety mechanism by monitoring the oil pressure and shutting down the GTC if the pressure falls below the required level. By doing so, it ensures that the GTC is not operated without sufficient lubrication, which could lead to damage or failure of the compressor.

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  • 16. 

    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

    Correct Answer
    A. Amount of field current
    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 armature to induce 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 of the generator.

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  • 17. 

    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

    Correct Answer
    A. Bleed air solenoid valve, L2
    Explanation
    The correct answer is the Bleed air solenoid valve, L2. The movement of the dual-ball selector valve in the A/M32A-60A generator is initiated by energizing the Bleed air solenoid valve, L2. This valve controls the flow of bleed air, which is necessary for the operation of the generator. By energizing the solenoid valve, the bleed air is allowed to flow and activate the dual-ball selector valve, enabling movement and operation of the generator.

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  • 18. 

    Torque is defined as

    • Wattage

    • Horsepower

    • Rotational force

    • Opposition to applied voltage

    Correct Answer
    A. Rotational force
    Explanation
    Torque is defined as rotational force. It is a measure of the force that can cause an object to rotate around an axis. It is commonly used in mechanics and engineering to describe the effectiveness of a force in rotating an object. Torque is dependent on both the magnitude of the force and the distance from the axis of rotation.

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  • 19. 

    In order to operate, a single-phase induction motor requires

    • Brushes

    • Slip rings

    • A commutator

    • A starting system

    Correct Answer
    A. A starting system
    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 cannot start on its own due to the absence of a rotating magnetic field. The starting system provides the necessary initial torque to the motor, allowing it to overcome inertia and start rotating. This can be achieved through various methods such as using a capacitor, a centrifugal switch, or a starting winding. Without a starting system, the motor would not be able to begin its operation.

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  • 20. 

    The advantage of using a turbocharger on a diesel 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

    Correct Answer
    A. Used more efficiently and horsepower is increased
    Explanation
    A turbocharger on a diesel engine increases the efficiency of fuel usage by compressing the air that enters the engine, allowing more fuel to be burned and producing more power. This increased efficiency leads to improved horsepower output, making the engine more powerful. Therefore, the correct answer is that the fuel is used more efficiently and horsepower is increased.

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  • 21. 

    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

    Correct Answer
    A. Direct current (DC) generator
    Explanation
    The self-excited AC generator provides its own field current from a built-in DC generator. This means that the AC generator has a separate DC generator within it that generates the necessary current to create the magnetic field required for the AC generator to produce electricity. This design allows the AC generator to operate independently without requiring an external power source for its field current.

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  • 22. 

    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

    Correct Answer
    A. 95 percent switch has closed
    Explanation
    The A/M32A-60A generator set cannot be loaded either electrically or pneumatically until after the 95 percent switch has closed. This means that the generator set needs to reach 95 percent of its capacity before it can be loaded with any electrical or pneumatic load. Only after the switch has closed, indicating that the generator set has reached this threshold, can it be safely loaded and used.

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  • 23. 

    When a motor continues turning after reaching its limit, this is known as

    • Inertia

    • Impedance

    • Inductance

    • Eddy currents

    Correct Answer
    A. Inertia
    Explanation
    Inertia refers to the tendency of a motor to continue turning even after it has reached its limit. This is due to the motor's momentum and resistance to changes in its motion. When the motor is powered off or the force causing its rotation is removed, the inertia causes it to keep spinning for a period of time before eventually coming to a stop.

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  • 24. 

    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

    Correct Answer
    A. Fuel from the fuel system
    Explanation
    The pressure to operate a pressure injector is provided by the fuel from the fuel system. Pressure injectors are used in various engines, such as gasoline and diesel engines, to deliver fuel into the combustion chamber at high pressure. This high pressure is necessary for efficient fuel atomization and combustion, resulting in optimal engine performance. Therefore, fuel from the fuel system is responsible for generating the required pressure to operate a pressure injector.

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  • 25. 

    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 manifold

    • Remove the valve cover and align the piston ring slots

    Correct Answer
    A. Hold the injector follower down or closed
    Explanation
    To locate a misfiring cylinder in a diesel engine, holding the injector follower down or closed with a screwdriver can be effective. By doing so, the fuel supply to that particular cylinder is cut off, causing the engine to run on the remaining cylinders. If the misfiring stops when the injector follower is held down, it indicates that the issue is likely with the fuel injector or its related components in that specific cylinder. This method helps isolate the problematic cylinder and assists in diagnosing and fixing the misfire.

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  • 26. 

    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

    Correct Answer
    A. Acceleration limiter valve and governor
    Explanation
    The acceleration limiter valve and governor are the two pressure controls in the fuel pump and control unit of the turbine engine. The acceleration limiter valve regulates the rate at which fuel is delivered to the engine, limiting the acceleration to prevent sudden surges or drops in power. The governor, on the other hand, maintains a constant engine speed by adjusting the fuel flow according to the load demands. Together, these two controls ensure smooth and efficient operation of the turbine engine.

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  • 27. 

    Crack pressure is defined as the amount of

    • Air pressure that is required to overcome fuel pressure

    • Air pressure that is required overcome spring tension

    • Fuel pressure that is required to overcome spring tension

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

    Correct Answer
    A. Fuel pressure that is required to overcome spring tension
    Explanation
    Crack pressure refers to the amount of pressure needed to overcome the spring tension in a system. In this case, the correct answer is "fuel pressure that is required to overcome spring tension." This means that the fuel pressure needs to be sufficient to overcome the tension of the spring in order for the system to function properly.

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  • 28. 

    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

    Correct Answer
    A. Rate adjustment screw
    Explanation
    The rate adjustment screw is responsible for controlling the time required to open the load control valve on the turbine engine. This screw allows for fine-tuning of the opening rate, ensuring that the valve opens at the desired speed. By adjusting the rate, the engine can effectively manage the flow of air or fuel, optimizing performance and efficiency. 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.

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  • 29. 

    If the gas turbine compressor (GTC) load control butterfly valve opens to 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

    Correct Answer
    A. Maladjusted rate adjustment screw
    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. The rate adjustment screw is responsible for controlling the speed at which the butterfly valve opens and closes. If it is not properly adjusted, it can result in incorrect or inconsistent valve movement, leading to the mentioned malfunction.

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  • 30. 

    During a preoperational inspection of a gas turbine engine, you check the intake and exhaust for 

    • Leakage

    • Excess heat

    • Hairline cracks

    • Foreign objects

    Correct Answer
    A. Foreign objects
    Explanation
    During a preoperational inspection of a gas turbine engine, checking for foreign objects is important because any debris or objects that enter the engine can cause damage to the internal components. Foreign objects can obstruct the airflow, leading to reduced engine performance or even complete engine failure. Therefore, it is crucial to ensure that the intake and exhaust are free from any foreign objects to maintain the engine's efficiency and prevent potential damage.

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  • 31. 

    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

    Correct Answer
    A. Troubleshooting chart
    Explanation
    A troubleshooting chart is a resource that provides information on common or frequently occurring troubles in a unit, their cause, and remedies. It is a useful tool for identifying and resolving issues in a systematic manner. The historical record may provide information on past issues, but it may not have the specific cause and remedy details needed. The maintenance record is focused on documenting maintenance activities rather than troubleshooting. The illustrated parts breakdown is a visual representation of the unit's components and may not provide troubleshooting information. Therefore, the best option for finding information on common troubles, their cause, and remedies is the troubleshooting chart.

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  • 32. 

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

    • Load valve

    • Hose relief valve

    • Rate adjusted screw

    • Pneumatic load thermostat

    Correct Answer
    A. Pneumatic load thermostat
    Explanation
    A pneumatic load thermostat is a device that regulates the flow of air in a system based on the load requirements. If the load requirements fluctuate rapidly, the pneumatic load thermostat may continuously adjust the airflow, causing the butterfly valve to oscillate. This oscillation occurs as the valve opens and closes in response to the changing airflow, resulting in a continual cycle of opening and closing.

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  • 33. 

    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

    Correct Answer
    A. Slip rings
    Explanation
    In a three-phase alternating current (AC) generator, slip rings are used to apply direct current (DC) to the field windings through the brushes. Slip rings are rotating metal rings that make continuous contact with the brushes, allowing the flow of DC power to the field windings. This creates a magnetic field that interacts with the rotating armature to generate the desired AC output. Diodes are typically used in rectifiers to convert AC to DC, while a commutator is used in DC generators to convert alternating current to direct current. Therefore, slip rings are the correct answer in this context.

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  • 34. 

    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

    Correct Answer
    A. Exciter generator
    Explanation
    The exciter generator provides the field current for the main AC generator section in a brushless AC generator. The exciter generator is a small generator connected to the main generator, and its primary function is to produce the necessary electrical power to create a magnetic field in the main generator's rotor. This magnetic field is essential for the generation of alternating current in the main generator. The exciter generator typically uses a small amount of the main generator's output to generate the required field current.

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  • 35. 

    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

    Correct Answer
    A. Turning the master switch OFF, then ON
    Explanation
    When the A/M32A-60A generator set shuts down due to low fuel, the fuel level relay, K4, needs to be reset. This can be done by turning the master switch OFF and then turning it back ON. This action will reset the relay and allow the generator set to operate normally again.

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  • 36. 

    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

    Correct Answer
    A. Battery charging diode
    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 for current. When the batteries are fully charged, the diode blocks any further charging current from flowing into the batteries. Similarly, when the unit is shut down, the diode prevents any discharge current from flowing out of the batteries. This helps to protect the batteries from overcharging and ensures that they remain fully charged when the generator is not in use.

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  • 37. 

    The health hazards associated with the gas turbine generator et include 

    • Its operating 5 times faster than a car engine

    • Noise, intense heat, and electrical shock

    • Excessive carbon monoxide buildup

    • Turbine wheel disintegration

    Correct Answer
    A. Noise, intense heat, and electrical shock
    Explanation
    The health hazards associated with the gas turbine generator include noise, intense heat, and electrical shock. Noise from the generator can lead to hearing damage or loss if proper hearing protection is not used. The intense heat generated by the turbine can cause burns or heat-related illnesses if proper safety measures are not in place. Additionally, the electrical components of the generator can pose a risk of electrical shock if not handled correctly, potentially leading to injury or even death.

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  • 38. 

    What indicator on the EPU-6/E frequency converter indicates and undervoltage condition?

    • Overvoltage

    • Out-of-phase

    • Undervoltage

    • Fault

    Correct Answer
    A. Undervoltage
    Explanation
    The correct answer is "Undervoltage." The question asks for the indicator on the EPU-6/E frequency converter that indicates an undervoltage condition. This means that when the voltage supplied to the converter drops below its normal level, the undervoltage indicator will be activated. The other options, such as overvoltage, out-of-phase, and fault, do not specifically indicate an undervoltage condition.

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  • 39. 

    The stator windings of a synchronous motor are spaced

    • 20 degrees apart

    • 30 degrees apart

    • 90 degrees apart

    • 120 degrees apart

    Correct Answer
    A. 120 degrees apart
    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 constant speed. By spacing the stator windings 120 degrees apart, the resulting magnetic fields produced by each winding will also be 120 degrees apart. This allows for a smooth and efficient rotation of the motor's rotor, ensuring synchronous operation.

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  • 40. 

    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

    Correct Answer
    A. When the AC cable switch is in the GEN 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.

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  • 41. 

    Which function of a lubricant compensates for microscopic irregularities in the cylinder wall?

    • Cooling

    • Sealing

    • Cleaning

    • Reducing friction

    Correct Answer
    A. Sealing
    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 microscopic gaps and imperfections on the surface. This helps to create a smooth and even surface, reducing friction and preventing metal-to-metal contact. By sealing these irregularities, the lubricant ensures proper lubrication and reduces wear and tear on the engine components.

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  • 42. 

    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

    Correct Answer
    A. Abrasion by foreign particles
    Explanation
    The filtration step in a diesel engine fuel system is designed to prevent the fuel system from being damaged by foreign particles. These particles can cause abrasion, which can lead to wear and tear on the engine components. By filtering out these particles, the fuel system is protected from potential damage and ensures the engine operates smoothly and efficiently.

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  • 43. 

    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

    Correct Answer
    A. Perform a preoperational check
    Explanation
    Performing a preoperational check is the first thing you should do when operating a diesel engine. This check ensures that all components of the engine are in proper working condition before starting it. It includes inspecting the fuel system, checking for any leaks or damage, examining the engine oil level and quality, inspecting the cooling system, and verifying that all safety devices are functioning correctly. By performing this check, you can identify any potential issues or malfunctions and address them before starting the engine, ensuring safe and efficient operation.

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  • 44. 

    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

    Correct Answer
    A. Starter motor
    Explanation
    The starter motor is responsible for rotating the turbine engine during starting. It provides the initial power needed to start the engine and get it running. The other options mentioned, such as the AC generator, fuel pump and control unit, and tachometer generator, are not directly involved in the starting process of the turbine engine. Therefore, the correct answer is the starter motor.

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  • 45. 

    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

    Correct Answer
    A. Tachometer generator
    Explanation
    If the drive shaft for the oil pump assembly in a gas turbine engine becomes sheared, the tachometer generator is rendered inoperative. The tachometer generator is connected to the drive shaft and relies on its rotation to generate electrical signals that are used to measure the engine's speed. Therefore, if the drive shaft is sheared and no longer rotates, the tachometer generator cannot generate the necessary signals and becomes inoperative.

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  • 46. 

    During gas turbine engine operation, the air is accelerated  by the

    • Diffusers

    • Exducers

    • Impellers

    • Deswirl ring

    Correct Answer
    A. Impellers
    Explanation
    Impellers are rotating components in a gas turbine engine that accelerate the air. They consist of a series of blades or vanes that increase the velocity of the air as it passes through them. This increased velocity helps to generate the necessary thrust for the engine to operate efficiently. Diffusers, exducers, and deswirl rings are not directly involved in accelerating the air, making them incorrect options.

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  • 47. 

    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

    Correct Answer
    A. 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 is opened, 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 or accidents.

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  • 48. 

    In the turbine engine, what prevents rupture of the rate diaphragm? 

    • Adjustment screw

    • Actuator regulator

    • Rate metering valve

    • Rate diaphragm return spring

    Correct Answer
    A. Adjustment screw
    Explanation
    The adjustment screw in the turbine engine prevents rupture of the rate diaphragm. It is responsible for controlling the flow of fuel, ensuring that it is at the correct rate. By adjusting the screw, the operator can regulate the fuel flow and prevent excessive pressure or stress on the rate diaphragm, thus avoiding rupture or damage.

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  • 49. 

    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

    Correct Answer
    A. A decrease in vibration after 35 percent
    Explanation
    The correct answer is a decrease in vibration after 35 percent. This means that the gas turbine compressor (GTC) experiences a decrease in vibrations as it accelerates, specifically after it reaches 35 percent of its maximum speed. This characteristic indicates that the GTC is operating smoothly and quietly during acceleration.

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Quiz Review Timeline (Updated): Aug 12, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Aug 12, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 05, 2017
    Quiz Created by
    Matthew

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