2A672 Volume 2 Frequency Converter Components

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  • 1/76 Questions

    What EPU-6/E frequency converter components must be inspected prior to use?

    • Air inlets for blockage
    • Wiring for secure mounting
    • Maintenance panels for corrosion
    • Interior air vents for secure mounting
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Aircraft Maintenance Quizzes & Trivia
About This Quiz

This quiz focuses on the EPU-6\/E frequency converter used in aircraft systems, assessing knowledge on its components, operation, and troubleshooting. It is designed for professionals in aircraft maintenance and electrical engineering, enhancing skills in managing and maintaining critical converter components.

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  • 2. 

    During operation of the EPU-6/E frequesncy converter it is determined that E and F pin voltage in not needed for the aircraft.  The operator places the Loop/bypass/28 V to aircraft switch to what position?

    • 28 V to aircraft

    • Neutral

    • Bypass

    • Loop

    Correct Answer
    A. Bypass
    Explanation
    During the operation of the EPU-6/E frequency converter, if it is determined that the E and F pin voltage is not needed for the aircraft, the operator should place the Loop/bypass/28 V to aircraft switch in the "Bypass" position.

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  • 3. 

    The function of the deswirl ring on the -95 gas turbine compressor is to

    • Accelerate air

    • Increase air pressure

    • Decrease air velocity

    • Smooth turbulent air flow

    Correct Answer
    A. Smooth turbulent air flow
    Explanation
    The deswirl ring on the -95 gas turbine compressor is designed to smooth turbulent air flow. Turbulent air flow can cause inefficiencies and disruptions in the compressor's operation. The deswirl ring helps to eliminate or reduce turbulence, ensuring that the air flows smoothly through the compressor. This allows for more efficient and effective compression of the air, leading to improved performance and overall operation of the gas turbine.

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  • 4. 

    What preliminary set-up step, if skipped, prevents the -95 from starting?

    • Set-up controls

    • Set parking brakes

    • Open and secure the exhaust door

    • Ensure the turbine air inlet and exhaust doors are free of obstructions

    Correct Answer
    A. Open and secure the exhaust door
    Explanation
    If the exhaust door is not opened and secured, it will prevent the -95 from starting. This is because the exhaust door needs to be open to allow the exhaust gases to escape from the turbine. If the door is closed or not properly secured, it will block the exhaust and prevent the turbine from starting. Therefore, it is crucial to open and secure the exhaust door as a preliminary set-up step before starting the -95.

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  • 5. 

    Bubbles in an air conditioner refrigeration system sight glass probably indicate

    • Refrigerant overcharge

    • A low refrigerant charge

    • High discharge temperature

    • Low discharge air temperature

    Correct Answer
    A. A low refrigerant charge
    Explanation
    Bubbles in an air conditioner refrigeration system sight glass probably indicate a low refrigerant charge. When there is a low refrigerant charge, the system does not have enough refrigerant to properly cool the air. This causes the refrigerant to evaporate quickly, leading to the formation of bubbles in the sight glass.

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  • 6. 

    The engine on the MA-3D air conditioner is operating at 1,250 rpm, but the blower clutch does not engage.  What do you do?

    • Replace SW2

    • Replace the engine speed control

    • Nothing, this is normal operation; the blower clutch energizes at governed speed

    • Check the MPU to make sure it's sending the proper signal to the engine speed control

    Correct Answer
    A. Nothing, this is normal operation; the blower clutch energizes at governed speed
    Explanation
    In this scenario, the correct answer is "nothing, this is normal operation; the blower clutch energizes at governed speed." This means that there is no need to take any action because the blower clutch will engage automatically once the engine reaches its governed speed. The blower clutch is designed to engage at a specific speed, and in this case, it will engage when the engine reaches its governed speed of 1,250 rpm. Therefore, there is no need to replace any parts or check any signals; the blower clutch will engage as intended.

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  • 7. 

    What type of engine starter does the ACE 802S air conditioner use?

    • Air

    • Manual

    • Electric

    • Hydraulic

    Correct Answer
    A. Air
    Explanation
    The ACE 802S air conditioner uses an air engine starter.

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  • 8. 

    What condition causes erratic operation of the MJ-2A-1 hydraulic test stand?

    • Air in the system

    • Fill relief valve set too low

    • Thermal relief valve set too high

    • Overserviced hydraulic reservoir

    Correct Answer
    A. Air in the system
    Explanation
    Air in the hydraulic system can cause erratic operation of the MJ-2A-1 hydraulic test stand. When air enters the system, it can create air pockets or bubbles that interfere with the proper flow of hydraulic fluid. This can lead to inconsistent performance, reduced efficiency, and potential damage to the components of the test stand. To resolve this issue, it is important to bleed the air out of the system and ensure that it is properly filled with hydraulic fluid.

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  • 9. 

    During load testing, the table on the MHU lift truck starts to tilt without changing the position on the control valve.  What is the probable cause?

    • Tilt cylinder leak

    • Azimuth cylinder leak

    • Latitudinal cylinder leak

    • Longitudinal cylinder leak

    Correct Answer
    A. Tilt cylinder leak
    Explanation
    The probable cause for the table on the MHU lift truck to tilt without changing the position on the control valve is a tilt cylinder leak. This means that there is a leakage in the cylinder responsible for controlling the tilt of the table, causing it to tilt unintentionally.

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  • 10. 

    A supervisor must document an NCO's safety training on AF Form

    • 2426

    • 623

    • 457

    • 55

    Correct Answer
    A. 55
  • 11. 

    What -95 component isolates the second-stage air from the operation of the first-stage compressor?

    • Interstage ducts

    • Interstage seal

    • Impellers

    • Inducers

    Correct Answer
    A. Interstage seal
    Explanation
    The interstage seal is the component that isolates the second-stage air from the operation of the first-stage compressor. It acts as a barrier between the two stages, preventing any air leakage or mixing between them. This ensures that the second-stage air is not affected by the operation of the first-stage compressor, allowing for efficient and controlled air flow in the system.

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  • 12. 

    What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?

    • Vacuum leaks

    • Inward leaks

    • Outward leaks

    • Pressure leaks

    Correct Answer
    A. Inward leaks
    Explanation
    Inward leaks occur in a refrigeration system when the pressure within the system is less than atmospheric pressure. This means that air or other gases from the outside are being drawn into the system, causing a decrease in pressure. These leaks can be problematic as they can introduce contaminants or affect the efficiency of the system.

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  • 13. 

    On the SGNSC, the auxiliary air system

    • Powers the booster compressor

    • Provides air to the feed air compressor

    • Provides low pressure air for pneumatic tools

    • Maintains 130 degreees F air temperature to prevent condensation

    Correct Answer
    A. Provides low pressure air for pneumatic tools
    Explanation
    The correct answer is "provides low pressure air for pneumatic tools." This means that the auxiliary air system on the SGNSC is responsible for supplying air at a lower pressure specifically for the operation of pneumatic tools.

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  • 14. 

    What SGNSC components separate the nitrogen from the oxygen?

    • ASM1, ASM2

    • CYL1, CYL2

    • FCV1, FCV2

    • PS1, TS4, TS5

    Correct Answer
    A. ASM1, ASM2
    Explanation
    The correct answer is ASM1, ASM2. These components in the SGNSC system are responsible for separating nitrogen from oxygen.

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  • 15. 

    The -95 does not shut down when the charging rate decreases to 12 amperes.  What is the probable cause of this trouble?

    • Air load switch

    • Fuel level relay K5

    • 2 speed solenoid SV4

    • Battery charging module

    Correct Answer
    A. Battery charging module
    Explanation
    The probable cause of the trouble is the battery charging module. This module is responsible for charging the battery, and if it is not functioning properly, the battery may not receive enough charge to stay powered when the charging rate decreases to 12 amperes.

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  • 16. 

    What MJ-2A-1 hydraulic test stand component prevents thermal expansion of the hydraulic fluid from rupturing a hydraulic line?

    • Heat exchanger

    • Temperature switch

    • Thermal relief valve

    • Low-pressure check/relief valve

    Correct Answer
    A. Thermal relief valve
    Explanation
    The thermal relief valve is the component that prevents thermal expansion of the hydraulic fluid from rupturing a hydraulic line. When the temperature of the fluid exceeds a certain threshold, the thermal relief valve opens to release excess pressure and prevent damage to the hydraulic line. This valve helps maintain the integrity and safety of the hydraulic system by regulating pressure caused by thermal expansion.

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  • 17. 

    Who determines the length of time it is considered economically feasible to repair a piece of equipment?

    • Supervisor

    • Installation commander

    • Uniform repair/replacement board

    • Item manager and equipment specialist

    Correct Answer
    A. Item manager and equipment specialist
    Explanation
    The item manager and equipment specialist are responsible for determining the length of time it is considered economically feasible to repair a piece of equipment. They have the expertise and knowledge to assess the cost of repairs, the availability of replacement parts, and the overall condition of the equipment. They consider factors such as the cost-effectiveness of repairs compared to replacement, the expected lifespan of the equipment after repairs, and the impact on operational efficiency. Their decision is crucial in ensuring that resources are allocated efficiently and that the equipment remains in optimal working condition.

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  • 18. 

    What prevents overpressurization of the bearing cavity on a -95?

    • Oil jet

    • Oil cooler

    • Scavenge pump

    • Oil tank vent line

    Correct Answer
    A. Oil tank vent line
    Explanation
    The oil tank vent line prevents overpressurization of the bearing cavity on a -95. When the oil heats up and expands, excess pressure can build up inside the bearing cavity. The oil tank vent line allows this pressure to escape, preventing overpressurization and potential damage to the bearings.

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  • 19. 

    You place the MA-3D air conditioner SW1 in the START position, but the engine does not operate.  What is the probable cause of this trouble?

    • K7 contacts are closed

    • Overspeed switch is closed

    • Oil pressure switch is closed

    • Override switch is not closed

    Correct Answer
    A. Override switch is not closed
    Explanation
    The probable cause of the engine not operating when the MA-3D air conditioner SW1 is in the START position is that the override switch is not closed.

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  • 20. 

    What MJ-2A-1 hydraulic test stand switch provides an alternate means of energizeng the fill pump when either of the microswitches is defective?

    • Fill switch, LS4

    • Micro switch, FS1

    • Engine master switch

    • Soft start relay switch

    Correct Answer
    A. Fill switch, LS4
    Explanation
    The MJ-2A-1 hydraulic test stand switch provides an alternate means of energizing the fill pump when either of the microswitches is defective. The fill switch, LS4, is the correct answer because it is specifically designed to activate the fill pump in case of a malfunction in the microswitches.

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  • 21. 

    During operation of the EPU-6/E frequency converter you determine that one phase voltage is lower than the other two phases.  What could cause this malfunction?

    • Malfunctioning transister

    • Burnt control transformer fuse

    • Improper SCR firing adjustment

    • Loose push-on connector on the output filter capacitor

    Correct Answer
    A. Loose push-on connector on the output filter capacitor
    Explanation
    A loose push-on connector on the output filter capacitor could cause one phase voltage to be lower than the other two phases. When the connector is loose, it may not provide a secure connection between the capacitor and the circuit, leading to a decrease in voltage. This can result in an imbalance between the phases, causing one phase voltage to be lower.

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  • 22. 

    What -95 chambers are pressurized when the butterfly valve is closed?

    • 1 and 3

    • 2 and 4

    • 1, 2, and 3

    • 1, 3, and 4

    Correct Answer
    A. 1, 3, and 4
    Explanation
    When the butterfly valve is closed, chambers 1, 3, and 4 are pressurized. The question is asking which chambers are pressurized in this specific scenario.

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  • 23. 

    While you are operating on MA-3D air conditioner, the output air temperature is too high, so you set the temperature control to maximum cooling.  The temperature controller sends a signal to

    • B7 which steps closed to meter R143a into the evaporator

    • B7 which steps open to meter R134a into the evaporator

    • The quench valve which opens to aid in cooling

    • S1 and S2 which open to aid in cooling

    Correct Answer
    A. B7 which steps open to meter R134a into the evaporator
  • 24. 

    What power source operates the heater/combustion section of the new generation heater (NGH)?

    • 12 VDC

    • 120 VAC

    • Hydraulic motor

    • Diesel engine only

    Correct Answer
    A. 120 VAC
    Explanation
    The correct answer is 120 VAC. This means that the heater/combustion section of the new generation heater operates using a 120-volt alternating current power source. This suggests that the heater is likely designed for use in electrical systems that provide this voltage, such as residential or commercial buildings. It may require a standard electrical outlet or connection to function properly.

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  • 25. 

    The control transformer perform on the EPU-6/E frequency converter provides

    • 28 VDC for the aircraft contactor

    • 240 VDC for the aircraft contactor

    • 120 VAC for the operation of E and F line 28 VDC power supply

    • 240 VAC for operation of E and F line 28 VDC power supply

    Correct Answer
    A. 120 VAC for the operation of E and F line 28 VDC power supply
    Explanation
    The control transformer on the EPU-6/E frequency converter provides 120 VAC for the operation of the E and F line 28 VDC power supply. This means that the control transformer converts the incoming voltage to 120 VAC, which is then used to power the E and F line 28 VDC power supply. This voltage is necessary for the proper functioning of the power supply, allowing it to provide the required 28 VDC power to the aircraft contactor.

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  • 26. 

    When the ACE 802S compressor is in the HOLD position, what is the compressor displacement?

    • Errratic

    • Constant

    • Minimum

    • Maximum

    Correct Answer
    A. Constant
    Explanation
    When the ACE 802S compressor is in the HOLD position, the compressor displacement remains constant. This means that the volume of air being compressed and delivered by the compressor does not change. Regardless of any fluctuations or changes in the system, the compressor displacement remains steady and consistent.

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  • 27. 

    On the -95, discharge air pressure at 100 percent engine speed should indicate

    • 55 +2 psig

    • 45 +2 psig

    • 35 +2 psig

    • 25 +2 psig

    Correct Answer
    A. 35 +2 psig
    Explanation
    At -95, discharge air pressure at 100 percent engine speed should indicate 35 +2 psig.

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  • 28. 

    Which of the following components provides 525 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

    Correct Answer
    A. Input auto transformer
    Explanation
    The correct answer is Input auto transformer. The input auto transformer is responsible for providing the required voltage of 525 VAC to the control transformer of the EPU-6/E frequency converter. It is designed to step up or step down the voltage as needed to ensure proper functioning of the control transformer.

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  • 29. 

    The three methods of heat transfer are

    • Sensible, latent, and super heat

    • Sensible, convection, and conduction

    • Conduction, convection, and radiation

    • Conduction, convection, and super heat

    Correct Answer
    A. Conduction, convection, and radiation
    Explanation
    The correct answer is conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between objects or substances. Convection is the transfer of heat through the movement of a fluid, such as air or water. Radiation is the transfer of heat through electromagnetic waves, without the need for a medium. These three methods of heat transfer are fundamental in understanding how heat moves from one object to another.

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  • 30. 

    While you are doing an ops check of an air conditioner, you notice the unit is short cycling.  What do you do to correct this trouble?

    • Increase the heat load

    • Lower the refrigerant charge

    • Check the receiver outlet valve

    • Decrease the setting of the LPCO

    Correct Answer
    A. Check the receiver outlet valve
    Explanation
    To correct the problem of short cycling in an air conditioner, checking the receiver outlet valve is the appropriate step. The receiver outlet valve regulates the flow of refrigerant from the receiver to the evaporator. If the valve is faulty or not functioning properly, it can cause the unit to short cycle. By checking the receiver outlet valve, any issues or blockages can be identified and resolved, allowing the air conditioner to operate efficiently and prevent short cycling.

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  • 31. 

    During operation you determine that there is an undervoltage fault problem with the EPU-6/E frequency converter unit.  What component could be malfunctioning?

    • Analog board has failed

    • Output trim potentiometer is centered

    • Voltage control board potentiometer is shorted

    • Audible alarm switch is in the silence position

    Correct Answer
    A. Analog board has failed
    Explanation
    The correct answer is that the analog board has failed. This means that the board responsible for converting analog signals into digital signals is not functioning properly. This could be causing the undervoltage fault problem with the EPU-6/E frequency converter unit.

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  • 32. 

    When heat is applied to an ice cube and the ice starts to melt, it is

    • Super heat

    • Latent heat

    • Sensible heat

    • Convection heat

    Correct Answer
    A. Latent heat
    Explanation
    When heat is applied to an ice cube and it starts to melt, the process is known as latent heat. Latent heat refers to the heat energy absorbed or released during a phase change, such as the solid ice turning into liquid water. In this case, the heat energy is used to break the bonds between the water molecules in the ice, allowing them to move more freely and transition into a liquid state. Therefore, latent heat is the correct answer in this context.

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  • 33. 

    The compressor switch on the ACE 802S must be held in the HOLD position when engaging the compressor in order to

    • Build up oil pressure

    • Defrost the evaporator

    • Allow the oil and discharge pressures to stabilize

    • Ensure the engine is at governed speed before engaging compressor

    Correct Answer
    A. Allow the oil and discharge pressures to stabilize
    Explanation
    When engaging the compressor on the ACE 802S, holding the compressor switch in the HOLD position allows the oil and discharge pressures to stabilize. This is important because the compressor needs stable oil and discharge pressures to operate efficiently and effectively. By stabilizing these pressures, the compressor can function properly and avoid any potential damage or malfunctions.

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  • 34. 

    What valve must be opened prior to starting the engine on the ACE 802S air conditioner system?

    • Air shutoff

    • Fuel shutoff

    • Coolant control

    • Refrigerant control

    Correct Answer
    A. Air shutoff
    Explanation
    The valve that must be opened prior to starting the engine on the ACE 802S air conditioner system is the air shutoff valve. This valve allows air to flow into the system, which is necessary for the engine to start and run properly. By opening the air shutoff valve, the necessary air supply is provided to the engine, allowing it to function effectively.

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  • 35. 

    What adjustment on the new generation heater (NGH) prevents coking in the combustion section?

    • Fuel pressure

    • Air/fuel ratio

    • Igniter timing

    • Fuel spray pattern

    Correct Answer
    A. Air/fuel ratio
    Explanation
    The air/fuel ratio is the correct answer because it refers to the balance between the amount of air and fuel being supplied to the combustion section of the new generation heater (NGH). Maintaining the correct air/fuel ratio is crucial in preventing coking, which is the buildup of carbon deposits that can occur when there is an imbalance in the combustion process. By ensuring the proper mixture of air and fuel, the NGH can operate efficiently and prevent coking from occurring.

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  • 36. 

    The air flowing through an air conditioner is also called

    • Heat

    • Heat load

    • Pounds per minute (ppm)

    • Cubic feet per minute (cfm)

    Correct Answer
    A. Heat load
    Explanation
    The air flowing through an air conditioner is referred to as "heat load" because it carries the thermal energy that needs to be removed or transferred by the air conditioner. Heat load represents the amount of heat that the air conditioner needs to handle in order to maintain the desired temperature in a space. It is a measure of the heat energy that is being added or removed from the air as it passes through the air conditioning system.

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  • 37. 

    What -95 gas turbine compressor section supplies high-volume, low-pressure air for combustion, cooling, and bleed air output?

    • Turbine section

    • Accessory section

    • Compressor section

    • Air regulator section

    Correct Answer
    A. Compressor section
    Explanation
    The correct answer is the compressor section. In a gas turbine, the compressor section is responsible for supplying high-volume, low-pressure air for various purposes such as combustion, cooling, and bleed air output. It compresses the incoming air, increasing its pressure before it enters the combustion chamber. This section plays a crucial role in the overall functioning and efficiency of the gas turbine.

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  • 38. 

    What medium is used to lubricate the engine starter on the ACE 802S air conditioner?

    • Air

    • Oil

    • Fuel

    • Coolant

    Correct Answer
    A. Fuel
    Explanation
    The medium used to lubricate the engine starter on the ACE 802S air conditioner is fuel. This is because fuel acts as a lubricant for the engine parts, including the starter, ensuring smooth operation and reducing friction. Oil is typically used for lubricating other engine components, while coolant is used for regulating engine temperature.

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  • 39. 

    The temperature controller on an MA-3D air conditioner opens the hot gas bypass valve if the

    • Air pressure is too low so the boiling point of the R134a must be increased

    • Suction air pressure is too high so the boiling point of the refrigerant can be decreased

    • Suction pressure is too low so the boiling point of the refrigerant must be increased to increase the output air temperature

    • Suction pressure is too high so the boiling point of the refrigerant must be decreased to decrease the output air temperature

    Correct Answer
    A. Suction pressure is too low so the boiling point of the refrigerant must be increased to increase the output air temperature
    Explanation
    The correct answer is that if the suction pressure is too low, the boiling point of the refrigerant must be increased to increase the output air temperature. This is because the suction pressure in an air conditioner is directly related to the boiling point of the refrigerant. If the suction pressure is too low, it means that the refrigerant is not evaporating properly, resulting in a lower output air temperature. By increasing the boiling point of the refrigerant, the temperature controller opens the hot gas bypass valve to allow more refrigerant to flow into the evaporator and increase the output air temperature.

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  • 40. 

    What MJ-2A-1 test stand component must be readjusted any time the high-pressure pump compensator setting is changed?

    • High-pressure pump volume control

    • High-pressure relief valve

    • Thermal relief valve

    • Bypass valve

    Correct Answer
    A. High-pressure relief valve
    Explanation
    The high-pressure relief valve must be readjusted any time the high-pressure pump compensator setting is changed. The high-pressure relief valve is responsible for releasing excess pressure from the system to prevent damage to the components. When the compensator setting is changed, it affects the pressure in the system, and therefore the relief valve needs to be readjusted to ensure that it is still set to the correct pressure threshold for releasing excess pressure.

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  • 41. 

    During a load test of an MHU lift truck, the operator changes the level of the table by changing the position of the

    • Longitudinal valve

    • Tilt control valve

    • Latitudinal valve

    • Azimuth valve

    Correct Answer
    A. Tilt control valve
    Explanation
    The correct answer is the tilt control valve. During a load test of an MHU lift truck, the operator changes the level of the table by adjusting the tilt control valve. This valve controls the angle or tilt of the lifting table, allowing the operator to raise or lower it as needed. The longitudinal valve, latitudinal valve, and azimuth valve do not directly control the table's level and are not relevant to this specific task.

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  • 42. 

    The maintenance organization submits the AFTO Form 375 to

    • MAJCOM HQ

    • The item manager

    • The equipment specialist

    • The uniform repair/replacement board

    Correct Answer
    A. MAJCOM HQ
    Explanation
    The maintenance organization submits the AFTO Form 375 to MAJCOM HQ because MAJCOM HQ is responsible for overseeing and coordinating maintenance activities for the entire Major Command. They need to be informed about any maintenance issues or requirements through the submission of the AFTO Form 375. This allows MAJCOM HQ to effectively manage and allocate resources, prioritize maintenance tasks, and ensure that maintenance is conducted in accordance with established guidelines and procedures.

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  • 43. 

    What -95 component closes to complete the electrical circuit to the fuel solenoid and ignition unit?

    • Load switch

    • Oil pressure switch

    • Turbine start switch

    • 35 percent centrifugal speed switch

    Correct Answer
    A. Oil pressure switch
    Explanation
    The oil pressure switch is the component that closes to complete the electrical circuit to the fuel solenoid and ignition unit. This switch is designed to monitor the oil pressure in the engine and when the pressure reaches a certain level, it closes the circuit to allow fuel to flow to the solenoid and ignition unit. This ensures that the engine has sufficient oil pressure before allowing the fuel to ignite, thereby protecting the engine from damage. The other options, such as the load switch, turbine start switch, and centrifugal speed switch, are not directly related to completing the electrical circuit for the fuel solenoid and ignition unit.

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  • 44. 

    While operating the split deck maintenance platform you realize that the platform will not lower.  What is the probable cause?

    • Corroded battery cables

    • A defective control cable

    • Main disconnect switch ON

    • Engine switch in RUN position

    Correct Answer
    A. A defective control cable
    Explanation
    A defective control cable is the probable cause for the split deck maintenance platform not lowering. A control cable is responsible for transmitting the signal from the control panel to the platform, allowing it to move up and down. If the control cable is defective, it may not be able to transmit the signal properly, resulting in the platform being unable to lower.

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  • 45. 

    Which form is used to report a hazardous condition?

    • AFTO Form 375

    • AF Form 457

    • AF Form 455

    • AF Form 55

    Correct Answer
    A. AF Form 457
    Explanation
    AF Form 457 is used to report a hazardous condition. This form is specifically designed to document and report any hazardous conditions or situations that may pose a risk to personnel, equipment, or the environment. By using AF Form 457, individuals can provide detailed information about the hazardous condition, including its location, nature, and potential consequences. This form ensures that the appropriate authorities are notified and can take necessary actions to mitigate the hazard and prevent any potential accidents or damages.

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  • 46. 

    What MA-3D air conditioner component controls refrigerant flow into the evaporator?

    • Quench valve

    • TXV solenoid valve

    • Hot gas bypass circuit

    • Electric expansion valve

    Correct Answer
    A. Electric expansion valve
    Explanation
    The electric expansion valve controls the flow of refrigerant into the evaporator in an MA-3D air conditioner. It is responsible for regulating the amount of refrigerant that enters the evaporator coil, ensuring efficient cooling. By opening and closing the valve, it can adjust the flow rate of refrigerant based on the cooling demand, maintaining the desired temperature in the space being cooled.

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  • 47. 

    What ACE 802S air conditioner system "supercharges" the compressor?

    • Defrost

    • Heat boost

    • Vapor injection

    • Liquid injection

    Correct Answer
    A. Vapor injection
    Explanation
    Vapor injection is the ACE 802S air conditioner system feature that "supercharges" the compressor. This means that vapor injection enhances the performance of the compressor by injecting additional vapor into the system, increasing its efficiency and cooling capacity. This feature allows the air conditioner to provide more effective cooling and better energy efficiency compared to systems without vapor injection.

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  • 48. 

    What is the probable cause when the MJ-1B lift truck engine does not start?

    • 10 amp fuse

    • 20 amp fuse

    • Low oil pressure

    • Neutral start switch S3 is closed

    Correct Answer
    A. 20 amp fuse
    Explanation
    The probable cause when the MJ-1B lift truck engine does not start is a blown 20 amp fuse.

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  • 49. 

    The -95's rate-metering valve prevents the butterfly valve from snapping open by bleeding air through the atmospheric bleed port from chamber

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 2
    Explanation
    The -95's rate-metering valve works by bleeding air through the atmospheric bleed port from the chamber. This prevents the butterfly valve from snapping open suddenly. The rate-metering valve regulates the flow of air, ensuring that it opens slowly and smoothly. This helps to prevent any sudden or abrupt movements of the butterfly valve, which could potentially cause damage or disruption.

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  • Dec 15, 2013
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