2A672 Code 6 Volume 2 UREs Complete

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  • 1/38 Questions

    What components on the EPU-6/E frequency converter 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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2A672 Code 6 Volume 2 UREs Complete - Quiz
About This Quiz

This quiz assesses knowledge on the EPU-6\/E frequency converter, focusing on operational troubleshooting, component inspections, and voltage regulation. It is designed for Air Force personnel specializing in electrical equipment maintenance, enhancing both technical skills and safety awareness.

Quiz Preview

  • 2. 

    What preliminary set-up step if skipped, would prevent the A/M32A-95 gas turbine compressor from starting?

    • Set-up controls

    • Set parking brake

    • Open and secure the exhaust door

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

    Correct Answer
    A. Open and secure the exhaust door
    Explanation
    If the exhaust door is not opened and secured, it would prevent the A/M32A-95 gas turbine compressor from starting. This is because the exhaust door allows the exhaust gases to exit the turbine, and if it is not open and secured, the gases would not be able to flow out properly, causing a buildup of pressure and preventing the compressor from starting.

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  • 3. 

    The nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC) operates

    • Electrically

    • Hydraulically

    • Pneumatically

    • By a belt off the engine crank shaft

    Correct Answer
    A. Hydraulically
    Explanation
    The correct answer is hydraulically because the nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC) operates using hydraulic power. This means that it uses fluid pressure to compress the nitrogen gas.

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  • 4. 

    A supervisor documents a noncommisioned officer's (NCO) safety training on Air Force Form

    • 2426

    • 623

    • 457

    • 55

    Correct Answer
    A. 55
  • 5. 

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

    • 28V to aircraft

    • Neutral

    • Bypass

    • Loop

    Correct Answer
    A. Bypass
    Explanation
    During the operation of the EPU-6/E frequency converter, it is found that the E and F pin voltage is not required for the aircraft. In this situation, the operator should place the loop/bypass/28V to aircraft switch in the "Bypass" position. This means that the converter will bypass the E and F pin voltage and provide power directly from the 28V source to the aircraft, ensuring that the necessary power is supplied without relying on the E and F pin voltage.

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  • 6. 

    What is the function of the deswirl ring on an A/M32A-95 gas turbine compressor?

    • Accelerate air

    • Decrease air velocity

    • Increase air pressure

    • Smooth turbulent air flow

    Correct Answer
    A. Smooth turbulent air flow
    Explanation
    The deswirl ring on an A/M32A-95 gas turbine compressor is responsible for smoothing turbulent air flow. Turbulent air flow can cause inefficiencies and disruptions in the compressor's operation. The deswirl ring helps to reduce turbulence by redirecting and stabilizing the airflow, resulting in a smoother and more efficient compression process.

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  • 7. 

    What prevents engine operation of an A/M32A-95 gas turbine compressor if oil pressure is low?

    • Fuel safety switch

    • Oil pressure switch

    • Oil filter bypass valve

    • Oil pressure relief valve

    Correct Answer
    A. Oil pressure switch
    Explanation
    The oil pressure switch is responsible for preventing the engine operation of an A/M32A-95 gas turbine compressor if the oil pressure is low. This switch is designed to monitor the oil pressure and if it detects that the pressure is below the required level, it will send a signal to the engine control system to prevent the engine from starting or running. This is important because low oil pressure can lead to inadequate lubrication, causing damage to the engine components. Therefore, the oil pressure switch plays a crucial role in ensuring the safe and proper operation of the gas turbine compressor.

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  • 8. 

    The engine on the MA-3D air conditioner is operating at 1250 revolutions per minute (RPM), but the blower clutch does not engage.  What do you do?

    • Replace SW2

    • Replace 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 control

    Correct Answer
    A. Nothing; this is normal operation. The blower clutch energizes at governed speed.
  • 9. 

    What is the fuction of the auxiliary air system on the self generating nitrogen servicing cart (SGNSC)?

    • Powers the booster compressor

    • Provides air to the feed air compressor

    • Provides low pressure air for pneumatic tools

    • Maintains 130F air temperature to preventcondensation

    Correct Answer
    A. Provides low pressure air for pneumatic tools
    Explanation
    The auxiliary air system on the self generating nitrogen servicing cart (SGNSC) provides low pressure air for pneumatic tools. This means that it supplies the necessary air pressure for the operation of tools that are powered by compressed air, such as drills, impact wrenches, and paint sprayers. This feature is important as it allows for the efficient and effective use of pneumatic tools in various maintenance and servicing tasks.

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  • 10. 

    What component on an A/M32A-95 gas turbine compressor 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 on an A/M32A-95 gas turbine compressor is responsible for isolating the second stage air from the operation of the first stage compressor. This seal acts as a barrier between the two stages, preventing any air or pressure from leaking between them. By isolating the second stage air, the interstage seal ensures that the first stage compressor operates independently and efficiently, without any interference or loss of performance from the second stage.

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  • 11. 

    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 substances from the surroundings are being drawn into the system, causing a leak.

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  • 12. 

    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 management and the equipment specialist

    Correct Answer
    A. Item management and the equipment specialist
    Explanation
    Item management and the equipment specialist determine the length of time it is considered economically feasible to repair a piece of equipment. These individuals are responsible for managing and maintaining the inventory of equipment, as well as assessing its condition and determining the most cost-effective course of action. They consider factors such as the cost of repairs, the remaining useful life of the equipment, and the availability of replacement parts. Ultimately, their expertise and analysis guide the decision-making process regarding equipment repairs.

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  • 13. 

    What components on the self generating nitrogen servicing cart (SGNSC) separate the nitrogen from the oxygen?

    • ASM1, ASM2

    • CY1, CYL2

    • FCV1, FCV2

    • PS1, TS4, TS5

    Correct Answer
    A. ASM1, ASM2
    Explanation
    The components ASM1 and ASM2 on the self generating nitrogen servicing cart (SGNSC) are responsible for separating the nitrogen from the oxygen. These components likely have specific mechanisms or processes in place that allow them to separate the two gases, ensuring that only nitrogen is delivered for servicing purposes. The other listed components (CY1, CYL2, FCV1, FCV2, PS1, TS4, TS5) may have different functions within the nitrogen servicing cart, but they do not play a role in the separation of nitrogen from oxygen.

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  • 14. 

    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 cause this malfunction?

    • Malfunctioning transistor

    • Improper SCR firing adjustment

    • Burnt control transformer fuse

    • 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 can result in a poor electrical connection, leading to a decrease in voltage. This can cause an imbalance in the three-phase system, resulting in one phase having a lower voltage compared to the others.

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  • 15. 

    The acceleration limiter valve on the A/M32A-95 gas turbine compressor operates a poppet valve to control fuel flow to the atomizer using control air pressure combined with

    • Oil pressure

    • Fuel pressure

    • Spring tension

    • Plenum air pressure

    Correct Answer
    A. Spring tension
    Explanation
    The acceleration limiter valve on the A/M32A-95 gas turbine compressor uses spring tension to control fuel flow to the atomizer. This means that the valve is designed in such a way that the tension of the spring determines the amount of fuel that is allowed to flow through the valve. As the spring tension increases or decreases, the valve will open or close accordingly, regulating the fuel flow and ultimately controlling the acceleration of the gas turbine compressor.

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  • 16. 

    What does frosting of a refrigerant system line or component indicate?

    • Open

    • Blockage

    • Condensing refrigerant

    • Low refrigerant charge

    Correct Answer
    A. Blockage
    Explanation
    Frosting of a refrigerant system line or component indicates a blockage. When there is a blockage in the system, the flow of refrigerant is restricted, causing a decrease in pressure and temperature. This leads to the formation of frost on the affected line or component. It is important to identify and address the blockage to ensure proper functioning of the refrigerant system.

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  • 17. 

    What A/M32A-95 gas turbine compressor engine component accelerates hot expanding gases and directs them into the nozzle ring?

    • Torus assembly

    • Combustor can

    • Combustor cap

    • Plenum

    Correct Answer
    A. Torus assembly
    Explanation
    The torus assembly is the component of the A/M32A-95 gas turbine compressor engine that accelerates hot expanding gases and directs them into the nozzle ring.

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  • 18. 

    What prevents overpressurization of the bearing cavity on an A/M32A-95 gas turbine compressor?

    • 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 an A/M32A-95 gas turbine compressor. This is because the vent line allows excess pressure to be released from the bearing cavity, preventing any build-up of pressure that could potentially damage the compressor.

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  • 19. 

    What component determines the speed of the nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC)?

    • Engine

    • End of stroke limit switch

    • Programmable logic controller (PLC) circuit

    • Directional control valve cycling control relay

    Correct Answer
    A. Programmable logic controller (PLC) circuit
    Explanation
    The speed of the nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC) is determined by the programmable logic controller (PLC) circuit. The PLC circuit controls the operation and speed of various components in the cart, including the nitrogen booster compressor. It receives input signals and uses pre-programmed instructions to control the compressor's speed, ensuring optimal performance and efficiency.

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  • 20. 

    If you have an aerospace ground equipment (AGE) unit that is overhauled, it is considered to be how old at the completion of the overhaul?

    • 1 year

    • 18 months

    • 2 years

    • 30 months

    Correct Answer
    A. 2 years
    Explanation
    When an aerospace ground equipment (AGE) unit is overhauled, it is considered to be 2 years old at the completion of the overhaul. This suggests that the overhaul process takes a significant amount of time, resulting in the AGE unit being considered 2 years old once it is completed.

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  • 21. 

    On an A/M32A-95 gas turbine compressor what chambers are pressurized when the butterfly valve is closed?

    • 1 & 3

    • 2 & 4

    • 1, 2, and 3

    • 1, 3, and 4

    Correct Answer
    A. 1, 3, and 4
    Explanation
    When the butterfly valve is closed on an A/M32A-95 gas turbine compressor, chambers 1, 3, and 4 are pressurized.

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  • 22. 

    What is the minimum interval at which the input and output terminals of the EPU -6/E are inspected

    • Daily

    • Annually

    • Prior to use

    • Semiannually

    Correct Answer
    A. Semiannually
    Explanation
    The input and output terminals of the EPU -6/E should be inspected at least twice a year, which is known as semiannually. This ensures that any potential issues or malfunctions are detected and addressed in a timely manner, preventing any disruptions or damage to the system. Regular inspections also help to maintain the overall performance and reliability of the EPU -6/E.

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  • 23. 

    Which switch on the A/M32A-95 gas turbine compressor starts the automatic starting cycle?

    • Turbine start switch

    • Air Load switch

    • Inhibit switch

    • Master switch

    Correct Answer
    A. Turbine start switch
    Explanation
    The correct answer is the Turbine start switch. This switch is responsible for initiating the automatic starting cycle of the A/M32A-95 gas turbine compressor. It activates the necessary systems and processes to start the turbine and bring it up to operating speed. The other switches mentioned, such as the Air Load switch, Inhibit switch, and Master switch, may have different functions but are not directly involved in starting the automatic cycle.

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  • 24. 

    To whom does the maintenance organization submit the Air Force Technical Order (AFTO) Form 375?

    • MAJCOM HQ

    • Item manager

    • Equipment specialist

    • Uniform repair/replacement board

    Correct Answer
    A. MAJCOM HQ
    Explanation
    The maintenance organization submits the Air Force Technical Order (AFTO) Form 375 to the MAJCOM HQ.

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  • 25. 

    During operation of the EPU-6/E frequency converter the operator determines that there is an undervoltage (UV) fault problem with the unit.  What component could be malfunctioning?

    • The analog board has failed

    • The output trim potentiometer is centered

    • The voltage control board potentiometer is shorted

    • The audible alarm switch is in the silence position

    Correct Answer
    A. The analog board has failed
    Explanation
    The correct answer is that the analog board has failed. This means that the component responsible for converting the electrical signals into analog signals has malfunctioned, causing the undervoltage fault problem. The other options provided do not directly relate to the issue of undervoltage.

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  • 26. 

    The heat sink on the MA-3D air conditioner

    • Circulates the ethylene glycol/water solution

    • Cools the ethylene glycol/water solution

    • Cools discharge air from the blower

    • Cools ambient air

    Correct Answer
    A. Cools the ethylene glycol/water solution
    Explanation
    The heat sink on the MA-3D air conditioner cools the ethylene glycol/water solution. This means that the heat sink is responsible for removing heat from the solution, thereby cooling it down. The ethylene glycol/water solution is likely used as a coolant in the air conditioner system, and the heat sink plays a crucial role in maintaining the desired temperature by cooling the solution.

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  • 27. 

    What component on an MA-3D air conditioner increases the ambient air temperature approximately 60 degrees Fahrenheit?

    • Blower

    • Compressor

    • Evaporator

    • Aftercooler

    Correct Answer
    A. Blower
    Explanation
    The blower on an MA-3D air conditioner increases the ambient air temperature approximately 60 degrees Fahrenheit. The blower is responsible for drawing in air from the surrounding environment and passing it over the evaporator coil. As the air passes over the coil, it absorbs heat from the refrigerant, causing the temperature of the air to increase. This heated air is then blown back into the room, raising the ambient air temperature by approximately 60 degrees Fahrenheit.

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  • 28. 

    What components receive potential directly from the input transformer?

    • Analog board and alarm display

    • Control transformer and voltage control

    • Input circuit breakers and display power supply

    • SCR voltage regulator and phase sequence transformer

    Correct Answer
    A. SCR voltage regulator and phase sequence transformer
    Explanation
    The SCR voltage regulator and phase sequence transformer are the components that directly receive potential from the input transformer. The input transformer is responsible for converting the voltage from the power source to a suitable level for the system. The SCR voltage regulator regulates the voltage to ensure it remains within the desired range, while the phase sequence transformer helps maintain the correct phase sequence of the electrical supply. Both of these components play crucial roles in managing the potential received from the input transformer.

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  • 29. 

    While you are operating an MA-3D air conditioner, the output 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 refrigerant into the evaporator

    • B7 which steps open to meter refrigerant into the evaporator

    • The quench valve which opens to aid in cooling

    • S1 and S2 which open to aid cooling

    Correct Answer
    A. B7 which steps open to meter refrigerant into the evaporator
    Explanation
    The correct answer is B7 which steps open to meter refrigerant into the evaporator. When the output temperature of the air conditioner is too high, setting the temperature control to maximum cooling activates B7, which opens to allow the metering of refrigerant into the evaporator. This helps to lower the temperature and improve the cooling efficiency of the air conditioner.

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  • 30. 

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

    • K7 contacts are closed

    • Overspeed switch is closed

    • Override switch is not closed

    • Oil pressure switch is closed

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

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  • 31. 

    Refer to foldout 2.  During operational check of an A/M32A-95 gas turbine compressor, you place the air load switch S2 in the ON position.  The butterfly valve starts to open at 95 percent.  What do you check?

    • SV2

    • S10

    • TD2

    • K6

    Correct Answer
    A. TD2
    Explanation
    After placing the air load switch S2 in the ON position, the butterfly valve should start to open at 95 percent. Therefore, to check if everything is functioning correctly, you would need to check TD2.

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  • 32. 

    What causes the starter solenoid on the self generating nitrogen servicing cart (SGNSC) to disengage during normal operation?

    • Alternator output

    • Oil pressure switch

    • Ignition switch is released

    • Centrifugal switch opens

    Correct Answer
    A. Alternator output
    Explanation
    The correct answer is "Alternator output." During normal operation, the starter solenoid on the self-generating nitrogen servicing cart (SGNSC) disengages when the alternator output is detected. This is likely because the alternator is providing sufficient power to the system, indicating that the engine has started and no longer requires the starter motor.

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  • 33. 

    What component on the A/M32A-95 gas turbine compressor 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 on the A/M32A-95 gas turbine compressor closes to complete the electrical circuit to the fuel solenoid and ignition unit. This switch is designed to monitor the oil pressure in the system. When the oil pressure reaches a certain level, the switch closes, allowing the electrical circuit to be completed and activating the fuel solenoid and ignition unit. This ensures that the turbine compressor only starts when the oil pressure is at a safe level, preventing any potential damage to the system.

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  • 34. 

    Refer to foldout 2.  The A/M32A-95 gas turbine compressor runs up to 60 percent but the battery is not charging.  What is the probable cause of this trouble?

    • K4 energized and its contacts closed

    • K3 de-energized and its contacts opened

    • K4 de-energized and its contacts closed

    • K3 de-energized and the contacts did not remain closed

    Correct Answer
    A. K3 de-energized and the contacts did not remain closed
    Explanation
    The probable cause of the trouble is that K3 is de-energized and its contacts did not remain closed. This means that the circuit responsible for charging the battery is not functioning properly.

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  • 35. 

    Refer to foldout 2.  The A/M32A-95 gas turbine compressor cranks but doesn't start.  What is the probable cause of this trouble?

    • CB3 open

    • S9 shorted

    • SV1 coil is open

    • K7 not energizing

    Correct Answer
    A. SV1 coil is open
    Explanation
    The probable cause of the trouble is that the SV1 coil is open. This means that there is a break or disconnect in the electrical circuit of the SV1 coil, preventing it from receiving the necessary power to start the gas turbine compressor.

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  • 36. 

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

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

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

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

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

    Correct Answer
    A. Suction pressure is too low so boiling point of refrigerant must be increased to increase output air temp
    Explanation
    The correct answer is that the suction pressure is too low, so the boiling point of the refrigerant must be increased to increase the output air temperature. This is because the boiling point of a refrigerant is directly related to its pressure. When the suction pressure is too low, it means that the refrigerant is not evaporating efficiently, resulting in a lower output air temperature. By increasing the boiling point of the refrigerant, the system can ensure that it evaporates properly and produces a higher output air temperature.

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  • 37. 

    Refer to foldout 2.  What component on the A/M32A-95 gas turbine compressor energizes SV4?

    • Master switch

    • Air load valve

    • Air load switch

    • Oil pressure switch

    Correct Answer
    A. Air load switch
    Explanation
    The correct answer is the air load switch. The air load switch is the component on the A/M32A-95 gas turbine compressor that energizes SV4.

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  • 38. 

    What component on the MA-3D air conditioner provides 24 volts alternating current (VAC) for operation of the temperature controller?

    • Generator (G1)

    • Alternator (G2)

    • Power monitor relay (PMR)

    • Transformer rectifier (TR1)

    Correct Answer
    A. Transformer rectifier (TR1)
    Explanation
    The correct answer is Transformer rectifier (TR1). The transformer rectifier is responsible for converting the incoming alternating current (AC) voltage to a lower voltage of 24 volts alternating current (VAC). This lower voltage is then used to power the temperature controller, allowing it to operate properly. The generator (G1) and alternator (G2) are not mentioned in relation to providing voltage for the temperature controller. The power monitor relay (PMR) is also not mentioned as a component responsible for providing voltage. Therefore, the transformer rectifier (TR1) is the most appropriate component for this purpose.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 20, 2014
    Quiz Created by
    Dunlapryan

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