2A672 Vol 2 Pre-test
Questions and Answers
- 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?
- A.
28V to aircraft.
- B.
Neutral.
- C.
Bypass.
- D.
Loop.
Correct Answer
C. 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.Rate this question:
- 2.
(201) What components receive potential directly from the input auto transformer?
- A.
Analog board and alarm display.
- B.
Control transformer and voltage control.
- C.
Input circuit breakers and display power supply.
- D.
SCR voltage regulator and phase sequence transformer.
Correct Answer
D. 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.Rate this question:
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- 3.
(202) What components on the EPU–6/E frequency converter must be inspected prior to use?
- A.
Air inlets for blockage.
- B.
Wiring for secure mounting.
- C.
Maintenance panels for corrosion.
- D.
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.Rate this question:
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- 4.
- 202) What is the minimum interval at which the input and output terminals of the EPU–6/E are inspected?
- A.
Daily
- B.
Annually
- C.
Prior to use
- D.
Semiannually
Correct Answer
D. SemiannuallyExplanation
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.Rate this question:
- 5.
- (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?
- A.
The analog board has failed.
- B.
The output trim potentiometer is centered.
- C.
The voltage control board potentiometer is shorted.
- D.
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.Rate this question:
- 6.
- (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?
- A.
Malfunctioning transistor.
- B.
Improper SCR firing adjustment.
- C.
Burnt control transformer fuse.
- D.
Loose push-on connector on the output filter capacitor.
Correct Answer
D. 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.Rate this question:
- 7.
(203) What is the function of the deswirl ring on an A/M32A–95 gas turbine compressor?
- A.
Accelerate air
- B.
Decrease air velocity
- C.
Increase air pressure
- D.
Smooth turbulent air flow
Correct Answer
D. Smooth turbulent air flowExplanation
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.Rate this question:
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- 8.
(203) What component on an A/M32A–95 gas turbine compressor isolates the second stage air from the operation of the first stage compressor?
- A.
Interstage ducts
- B.
Interstage seals
- C.
Impellers
- D.
Inducers
Correct Answer
B. Interstage sealsExplanation
Interstage seals are the component on an A/M32A-95 gas turbine compressor that isolates the second stage air from the operation of the first stage compressor. These seals are designed to prevent air leakage between the stages, ensuring that the air from the first stage does not mix with the air from the second stage. By maintaining this separation, the efficiency and performance of the compressor are optimized.Rate this question:
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- 9.
(203) What A/M32A–95 gas turbine compressor engine component accelerates hot expanding gases and directs them into the nozzle ring?
- A.
Torus assembly
- B.
Combustor can
- C.
Combustor cap
- D.
Plenum
Correct Answer
A. Torus assemblyExplanation
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.Rate this question:
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- 10.
(204) What prevents engine operation of an A/M32A–95 gas turbine compressor if oil pressure is low?
- A.
Fuel safety switch
- B.
Oil pressure switch
- C.
Oil filter bypass switch
- D.
Oil pressure relief valve
Correct Answer
B. Oil pressure switchExplanation
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.Rate this question:
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- 11.
(204) What prevents overpressurization of the bearing cavity on an A/M32A–95 gas turbine compressor?
- A.
Oil jet
- B.
Oil cooler
- C.
Scavenge pump
- D.
Oil tank vent line
Correct Answer
D. Oil tank vent lineExplanation
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.Rate this question:
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- 12.
(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
- A.
Oil Pressure
- B.
Fuel pressure
- C.
Spring tension
- D.
Plenum air pressure
Correct Answer
C. Spring tensionExplanation
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.Rate this question:
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- 13.
(204) On an A/M32A–95 gas turbine compressor what chambers are pressurized when the butterfly valve is closed?
- A.
1&3
- B.
2&4
- C.
1,2, and 3
- D.
1,3, and 4
Correct Answer
D. 1,3, and 4Explanation
When the butterfly valve is closed on an A/M32A-95 gas turbine compressor, chambers 1, 3, and 4 are pressurized.Rate this question:
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- 14.
(204) What component on the A/M32A–95 gas turbine compressor closes to complete the electrical circuit to the fuel solenoid and ignition unit?
- A.
Load switch
- B.
Oil pressure switch
- C.
Turbine start switch
- D.
35 percent centrifugal switch
Correct Answer
B. Oil pressure switchExplanation
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.Rate this question:
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- 15.
(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?
- A.
K4 energized and its contacts closed.
- B.
K3 de-energized and its contacts opened.
- C.
K4 de-energized and its contacts closed.
- D.
K3 de-energized and the contacts did not remain closed.
Correct Answer
D. 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.Rate this question:
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- 16.
(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?
- A.
SV2
- B.
S10
- C.
TD2
- D.
K6
Correct Answer
C. TD2Explanation
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.Rate this question:
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- 17.
(204) Refer to foldout 2. What component on an A/M32A–95 gas turbine compressor energizes SV4?
- A.
Master switch
- B.
Air load valve
- C.
Air load switch
- D.
Oil pressure switch
Correct Answer
C. Air load switchExplanation
The correct answer is Air load switch. The Air load switch on an A/M32A-95 gas turbine compressor energizes SV4.Rate this question:
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- 18.
(205) What preliminary set-up step, if skipped, would prevent the A/M32A–95 gas turbine compressor from starting?
- A.
Set-up controls
- B.
Set parking brake
- C.
Open and secure the exhaust door
- D.
Ensure the turbine air inlet and exhaust outlet are free of combustion
Correct Answer
C. Open and secure the exhaust doorExplanation
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.Rate this question:
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- 19.
(205) Which switch on the A/M32A–95 gas turbine compressor starts the automatic starting cycle?
- A.
Turbine start switch
- B.
Air Load switch
- C.
Inhibit switch
- D.
Master switch
Correct Answer
A. Turbine start switchExplanation
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.Rate this question:
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- 20.
(205) Refer to foldout 2. The A/M32A–95 engine cranks but doesn’t start. What is the probable cause of this trouble?
- A.
CB3 is open
- B.
S9 is shorted
- C.
SV1 coil is open
- D.
K7 is not energizing
Correct Answer
C. SV1 coil is openExplanation
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.Rate this question:
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- 21.
(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
- A.
B7 which steps closed to meter refrigerant into the evaporator.
- B.
B7 which steps open to meter refrigerant into the evaporator.
- C.
The quench valve which opens to aid in cooling.
- D.
S1 and S2 which open to aid in cooling.
Correct Answer
B. 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.Rate this question:
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- 22.
(206) The temperature controller on an MA–3D air conditioner opens the hot gas bypass valve if the
- A.
Suction air pressure is too high so the boiling point of the refrigerant can be decreased.
- B.
Air pressure is too low so the boiling point of the R134a must be increased.
- C.
Suction pressure is too high so the boiling point of the refrigerant must be decreased to decrease the output air temperature.
- D.
Suction pressure is too low so the boiling point of the refrigerant must be increased to increase the output air temperature.
Correct Answer
D. 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.Rate this question:
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- 23.
(206) What component on an MA–3D air conditioner increases the ambient air temperature approximately 60 degrees Fahrenheit (°F)?
- A.
Blower
- B.
Compressor
- C.
Evaporator
- D.
Aftercooler
Correct Answer
A. BlowerExplanation
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.Rate this question:
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- 24.
(206) The heat sink on the MA–3D
- A.
Circulates the ethylene glycol/water solution.
- B.
Cools the ethylene glycol/water solution.
- C.
Cools discharge air from the blower.
- D.
Cools ambient air.
Correct Answer
B. Cools the ethylene glycol/water solution.Explanation
The heat sink on the MA-3D cools the ethylene glycol/water solution.Rate this question:
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- 25.
(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?
- A.
K7 contacts are closed.
- B.
Overspeed switch is closed.
- C.
Override switch is not closed.
- D.
Oil pressure switch is closed.
Correct Answer
C. 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.Rate this question:
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- 26.
(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?
- A.
Replace SW2.
- B.
Replace the engine speed control.
- C.
Nothing; this is normal operation. The blower clutch energizes at governed speed.
- D.
Check the MPU to make sure it’s sending the proper signal to the engine speed control.
Correct Answer
C. 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.Rate this question:
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- 27.
(207) What component on the MA–3D air conditioner provides 24 volts alternating current (VAC) for operation of the temperature controller?
- A.
Generator (G1).
- B.
Alternator (G2).
- C.
Power monitor relay (PMR).
- D.
Transformer rectifier (TR1).
Correct Answer
D. 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).Rate this question:
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- 28.
(208) What does frosting of a refrigeration system line or component indicate?
- A.
Open
- B.
Blockage
- C.
Condensing refrigerant
- D.
Low refrigerant charge
Correct Answer
B. BlockageExplanation
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.Rate this question:
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- 29.
(208) What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?
- A.
Vacuum leaks
- B.
Inward leaks
- C.
Outward leaks
- D.
Pressure leaks
Correct Answer
B. Inward leaksExplanation
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.Rate this question:
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- 30.
(209) What is the function of the auxiliary air system on the self generating nitrogen servicing cart (SGNSC)?
- A.
Powers the booster compressor.
- B.
Provides air to the feed air compressor.
- C.
Provides low pressure air for pneumatic tools.
- D.
Maintains 130°F air temperature to prevent condensation.
Correct Answer
C. 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.Rate this question:
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- 31.
209) What components on the self generating nitrogen servicing cart (SGNSC) separate the nitrogen from the oxygen?
- A.
ASM1, ASM2
- B.
CYL1, CYL2
- C.
FCV1, FCV2
- D.
PS1, TS4, TS5
Correct Answer
A. ASM1, ASM2Explanation
ASM1 and ASM2 are the components on the self-generating nitrogen servicing cart (SGNSC) that separate the nitrogen from the oxygen.Rate this question:
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- 32.
(209) The nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC) operates
- A.
Electrically
- B.
Hydraulically
- C.
Pneaumatically
- D.
By the belt off the engine crank shaft
Correct Answer
B. HydraulicallyExplanation
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.Rate this question:
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- 33.
(210) What causes the starter solenoid on the self generating nitrogen servicing cart (SGNSC) to disengage during normal operation?
- A.
Alternator output
- B.
Oil pressure switch
- C.
Ignition switch released
- D.
Centrifugal switch opens
Correct Answer
A. Alternator outputExplanation
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.Rate this question:
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- 34.
(210) What component determines the speed of the nitrogen booster compressor on the self generating nitrogen servicing cart (SGNSC)?
- A.
Engine
- B.
End of stroke limit switch
- C.
Programmable logic controller (PLC) circuit
- D.
Directional control valve cycling control relay
Correct Answer
C. Programmable logic controller (PLC) circuitExplanation
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.Rate this question:
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- 35.
(211) A supervisor documents a noncommissioned officer’s (NCO) safety training on Air Force Form
- A.
2426
- B.
623
- C.
457
- D.
55
Correct Answer
D. 55 -
- 36.
(212) Who determines the length of time it is considered economically feasible to repair a piece of equipment?
- A.
Supervisor
- B.
Installation commander
- C.
Uniform repair/ replacement board
- D.
Item management and the equipment specialist
Correct Answer
D. Item management and the equipment specialistExplanation
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.Rate this question:
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- 37.
(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?
- A.
1 year
- B.
18 months
- C.
2 years
- D.
30 months
Correct Answer
C. 2 yearsExplanation
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.Rate this question:
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- 38.
(212) To whom does the maintenance organization submit the Air Force Technical Order (AFTO) Form 375?
- A.
MAJCOM HQ
- B.
Item manager
- C.
Equipment specialist
- D.
Uniform repair/ replacement board
Correct Answer
A. MAJCOM HQExplanation
The maintenance organization submits the Air Force Technical Order (AFTO) Form 375 to the MAJCOM HQ.Rate this question:
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Mar 21, 2023Quiz Edited by
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Feb 04, 2014Quiz Created by
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