2A672 Vol 2 Pre-test

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  • 1/38 Questions

    (203) 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 seals
    • Impellers
    • Inducers
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Electrical Systems Quizzes & Trivia
About This Quiz

The '2A672 VOL 2 PRE-TEST' assesses knowledge on the EPU\u20136\/E frequency converter used in aircraft. It covers operational troubleshooting, component inspections, and voltage regulation, crucial for maintaining aircraft electrical systems. This quiz is essential for professionals in aircraft maintenance and engineering.

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  • 2. 

    (205) 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 outlet are free of combustion

    Correct Answer
    A. Open and secure the exhaust door
    Explanation
    The A/M32A-95 gas turbine compressor requires the exhaust door to be open and secured in order to start. If this step is skipped, the exhaust gases will not be able to escape properly, preventing the compressor from starting.

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  • 3. 

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

    • Electrically

    • Hydraulically

    • Pneaumatically

    • By the belt off the engine crank shaft

    Correct Answer
    A. Hydraulically
    Explanation
    The correct answer is "Hydraulically." The nitrogen booster compressor on the self-generating nitrogen servicing cart (SGNSC) operates using hydraulic power. This means that it uses fluid pressure to generate the necessary force to compress the nitrogen. This method is commonly used in industrial applications where high pressure is required, as hydraulic systems can provide significant force and control.

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  • 4. 

    (211) A supervisor documents a noncommissioned officer’s (NCO) safety training on Air Force Form 

    • 2426

    • 623

    • 457

    • 55

    Correct Answer
    A. 55
  • 5. 

    (207) 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 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
    The correct answer states that there is no need to do anything because this is considered normal operation. The blower clutch will only engage at the governed speed, which means that it will not engage until the engine reaches a certain RPM. Therefore, there is no issue with the blower clutch not engaging at 1250 RPM.

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  • 6. 

    (208) 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 outside are being drawn into the system, causing a leak.

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  • 7. 

    1. (201) During operation of the EPU–6/E frequency converter it is determined that 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
    When it is determined that the E and F pin voltage is not needed for the aircraft during operation of the EPU-6/E frequency converter, the operator should place the loop/bypass/28V to aircraft switch to the "Bypass" position. This means that the voltage will bypass the E and F pins and not be used for the aircraft.

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  • 8. 

    (203) 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 disrupt the efficiency and performance of the compressor, so the deswirl ring is designed to minimize turbulence and create a more streamlined and consistent flow of air. This helps to optimize the compressor's operation and ensure smooth and efficient airflow through the system.

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  • 9. 

    (208) What does frosting of a refrigeration system line or component indicate?    

    • Open

    • Blockage

    • Condensing refrigerant

    • Low refrigerant charge

    Correct Answer
    A. Blockage
    Explanation
    Frosting of a refrigeration system line or component indicates a blockage. When there is a blockage in the system, the refrigerant flow is restricted, causing the temperature of the line or component to drop. This drop in temperature leads to the formation of frost on the surface. Therefore, the presence of frosting indicates that there is a blockage in the refrigeration system.

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  • 10. 

    (202) 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.

    Correct Answer
    A. Air inlets for blockage.
    Explanation
    Before using the EPU-6/E frequency converter, it is important to inspect the air inlets for blockage. This is necessary to ensure proper airflow and prevent overheating of the components. Blockage in the air inlets can restrict the flow of air, leading to inadequate cooling and potential damage to the converter. Therefore, inspecting the air inlets for blockage is crucial for the safe and efficient operation of the EPU-6/E frequency converter.

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  • 11. 

    (203) 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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  • 12. 

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

    • ASM1, ASM2

    • CYL1, CYL2

    • FCV1, FCV2

    • PS1, TS4, TS5

    Correct Answer
    A. ASM1, ASM2
    Explanation
    ASM1 and ASM2 are the components on the self-generating nitrogen servicing cart (SGNSC) that separate the nitrogen from the oxygen.

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  • 13. 

    (212) 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
    After 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, approximately 2 years, to complete.

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  • 14. 

    (204) 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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  • 15. 

    (204) 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 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 means that when the oil pressure reaches a certain level, the switch will close, allowing the circuit to be completed and the fuel solenoid and ignition unit to be activated. This switch is an important safety feature as it ensures that the fuel is only ignited when there is sufficient oil pressure, preventing any potential accidents or damage to the turbine.

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  • 16. 

    (209) What is the function 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 130°F air temperature to prevent condensation.

    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 air at a lower pressure for the operation of tools that are powered by compressed air. This function is important for tasks that require the use of pneumatic tools, such as maintenance and repair work on aircraft or other equipment.

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  • 17. 

    (210) 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 correct answer is the Programmable Logic Controller (PLC) circuit. The PLC circuit is responsible for controlling and regulating the speed of the nitrogen booster compressor on the self-generating nitrogen servicing cart (SGNSC). It receives input signals from various sensors and devices, such as pressure sensors and flow meters, and based on the programmed logic, it adjusts the speed of the compressor to maintain the desired nitrogen pressure and flow rate. This ensures the efficient and effective operation of the nitrogen booster compressor.

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  • 18. 

    1. 202) 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 need to be inspected at least twice a year, which is considered as semiannually. This ensures that any potential issues or faults with the terminals can be identified and addressed in a timely manner. Regular inspections help to maintain the proper functioning of the EPU-6/E and prevent any potential damage or malfunctioning.

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  • 19. 

    1. (202) 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. This is because a loose connection can result in poor contact and increased resistance, leading to a drop in voltage.

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  • 20. 

    (204) 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. When the control air pressure combined with spring tension is at a certain level, the poppet valve opens and allows fuel to flow to the atomizer. Therefore, the correct answer is spring tension.

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  • 21. 

    (205) 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 turbine start switch is the switch on the A/M32A-95 gas turbine compressor that starts the automatic starting cycle. This switch is specifically designed to initiate the starting sequence of the turbine, allowing it to begin its operation. The other switches mentioned, such as the air load switch, inhibit switch, and master switch, do not have the same function of starting the automatic starting cycle.

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  • 22. 

    (206) The heat sink on the MA–3D

    • 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 cools the ethylene glycol/water solution.

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  • 23. 

    (207) 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.

    • Override switch is not closed.

    • Oil pressure switch is closed.

    Correct Answer
    A. Override switch is not closed.
    Explanation
    The probable cause of the trouble is that the override switch is not closed. This means that the switch is not in the correct position to allow the engine to operate when the MA-3D air conditioner SW1 is in the START position.

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  • 24. 

    1. (202) During operation of the EPU–6/E frequency converter the operator determines that there is an under voltage (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 the analog board has failed. This is because an under voltage fault indicates that the voltage being supplied to the unit is lower than the required level. The analog board is responsible for monitoring and regulating the voltage, so if it fails, it can result in an under voltage fault.

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  • 25. 

    (204) 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 switch

    • Oil pressure relief valve

    Correct Answer
    A. Oil pressure switch
    Explanation
    The oil pressure switch is responsible for preventing engine operation of an A/M32A-95 gas turbine compressor if the oil pressure is low. This switch acts as a safety mechanism to ensure that the engine does not operate without sufficient oil pressure, which is necessary for proper lubrication and functioning of the engine. If the oil pressure is low, the switch will not allow the engine to start or continue running, preventing potential damage to the engine.

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  • 26. 

    (212) 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. They are responsible for assessing the condition of the equipment and evaluating the cost and benefits of repairing it versus replacing it. They consider factors such as the cost of repairs, the expected lifespan of the equipment after repairs, and the availability of replacement parts. Based on their analysis, they make a decision on whether it is more cost-effective to repair or replace the equipment.

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  • 27. 

    (204) 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 potential damage or failure due to overpressurization.

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  • 28. 

    (206) While you are operating an 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 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 in 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 air temperature of the air conditioner is too high, setting the temperature control to maximum cooling is necessary. In order to achieve this, the temperature controller sends a signal to B7, which then opens to meter refrigerant into the evaporator. This allows for more cooling capacity and helps to lower the output air temperature.

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  • 29. 

    (206) What component on an MA–3D air conditioner increases the ambient air temperature approximately 60 degrees Fahrenheit (°F)?

    • 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. This is because the blower is responsible for circulating the air through the system, allowing it to come into contact with the heating elements and increasing its temperature.

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  • 30. 

    (210) 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 released

    • Centrifugal switch opens

    Correct Answer
    A. Alternator output
    Explanation
    The correct answer is Alternator output. The starter solenoid on the self-generating nitrogen servicing cart (SGNSC) disengages during normal operation when the alternator output is detected. This means that once the alternator is generating enough power, the starter solenoid is no longer needed and can disengage.

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  • 31. 

    (212) 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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  • 32. 

    (201) What components receive potential directly from the input auto 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 components that receive potential directly from the input auto transformer are the SCR voltage regulator and the phase sequence transformer.

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  • 33. 

    (204) Refer to foldout 2. During an 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
    During an operational check of an A/M32A-95 gas turbine compressor, when the air load switch S2 is placed in the ON position and the butterfly valve starts to open at 95 percent, you would check TD2.

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  • 34. 

    (205) Refer to foldout 2. The A/M32A–95 engine cranks but doesn’t start. What is the probable cause of this trouble?

    • CB3 is open

    • S9 is shorted

    • SV1 coil is open

    • K7 is not energizing

    Correct Answer
    A. SV1 coil is open
    Explanation
    The probable cause of the engine cranking but not starting is that the SV1 coil is open. This means that there is an issue with the coil, causing it to not function properly. As a result, the necessary electrical current is not being supplied to start the engine.

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  • 35. 

    (204) Refer to foldout 2. The A/M32A–95 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, resulting in the battery not charging even though the A/M32A-95 is running.

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  • 36. 

    (206) 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 the boiling point of the refrigerant must be increased to increase 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 suction pressure is too low so the boiling point of the refrigerant must be increased to increase the output air temperature. When the suction pressure is too low, it means that there is not enough refrigerant entering the compressor. This causes the boiling point of the refrigerant to decrease, resulting in a lower output air temperature. By increasing the boiling point of the refrigerant, the air conditioner can increase the output air temperature and improve its cooling efficiency.

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  • 37. 

    (207) 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 component on the MA-3D air conditioner that provides 24 volts alternating current (VAC) for operation of the temperature controller is the transformer rectifier (TR1).

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  • 38. 

    (204) Refer to foldout 2. What component on an 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 Air load switch. The Air load switch on an A/M32A-95 gas turbine compressor energizes SV4.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 04, 2014
    Quiz Created by
    Delgadoi

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