Age 2A672 (Vol 2)

38 Questions | By Lo973k3p | Last updated: Mar 22, 2022 | Total Attempts: 175

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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.
  
  Bypass.
- B.
  
  28V to aircraft.
- C.
  
  Loop.
- D.
  
  Neutral.
2.

(201) What components receive potential directly from the input auto transformer.
- A.
  
  Input circuit breakers and display power supply.
- B.
  
  Control transformer and voltage control.
- C.
  
  SCR voltage regulator and phase sequence transformers.
- D.
  
  Analog board and alarm display.
3.

(202) What component 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.
4.

(202) What is the minimum interval at which the input and output terminals of the EPU-6/E are inspected?
- A.
  
  Annually.
- B.
  
  Prior to use.
- C.
  
  Semiannually.
- D.
  
  Daily.
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 audible alarm switch is in the silence position.
- B.
  
  The voltage control board potentiometer is shorted.
- C.
  
  The ouput trim potentiometer is centered.
- D.
  
  The analog board has failed.
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 the malfunction?
- A.
  
  Malfunctioning transistor.
- B.
  
  Improper SCR firing adjustment.
- C.
  
  Burnt control transformer fuse.
- D.
  
  Loose push-on connector on the output filter capacitor.
7.

(203) What is the function of the deswirl ring on an A/M32A-95 gas turbine compressor?
- A.
  
  Increase air pressure.
- B.
  
  Decrease air velocity.
- C.
  
  Smooth turbulent air flow.
- D.
  
  Accelerate air.
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 seal.
- C.
  
  Impellers.
- D.
  
  Inducers
9.

(203) What A/M32A-95 gas turbine compressor engine component accelerates hot expanding gases and directs them into the nozzle ring?
- A.
  
  Plenum.
- B.
  
  Combustor cap.
- C.
  
  Combustor can.
- D.
  
  Torus assembly.
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 valve.
- D.
  
  Oil pressure relief valve.
11.

(204) What prevents overpressurization of the bearing cavity on an A/M32A-95 gas turbine compressor?
- A.
  
  Oil jet.
- B.
  
  Oil cooler.
- C.
  
  Scavange pump.
- D.
  
  Oil tank vent line.
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.
  
  Plenum air pressure.
- B.
  
  Fuel pressure.
- C.
  
  Oil pressure.
- D.
  
  Spring tension.
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.
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.
  
  Turbine start switch.
- B.
  
  35 percent centrifugal speed switch.
- C.
  
  Load switch.
- D.
  
  Oil pressure switch.
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.
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.
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.
18.

(205) What preliminary set-up step, if skipped, would prevent the A/M32A-95 gas turbine compressor from starting?
- A.
  
  Ensure the turbine air inlet and exhaust outlets are free of obstructions.
- B.
  
  Set-up controls.
- C.
  
  Set parking brake.
- D.
  
  Open and secure the exhaust door.
19.

(205) Which switch on the A/M32A-95 gas turbine compressor starts the automatic starting cycle?
- A.
  
  Inhibit switch.
- B.
  
  Master switch.
- C.
  
  Turbine Start switch.
- D.
  
  Air Load switch.
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.
21.

(206) While you are operating an MA-3D air conditioner, the output air temperature is too high, as 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.
22.

(206) The temperature controller on an MA-3D air conditioner opens the hot gas bypass valve if the
- A.
  
  Suction pressure is too high so the boiling point of the refrigerant must be decreased to decrease the output air temperature.
- B.
  
  Air pressure is too low so the boiling point of the R134a must be increased.
- C.
  
  Suction pressure is too low so the boiling point of the refrigerant must be increased to increase the output air temperature.
- D.
  
  Suction air pressure is too high so the boiling point of the refrigerant can be decreased.
23.

(206) What component of an MA-3D air conditioner increases the ambient air temperature approximately 60 degrees Fahrenheit?
- A.
  
  Compressor.
- B.
  
  Blower.
- C.
  
  Evaporator.
- D.
  
  Aftercooler.
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.
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.
  
  Override switch is not closed.
- B.
  
  K7 contacts are closed.
- C.
  
  Overspeed switch is closed.
- D.
  
  Oil pressure switch is closed.

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Sample Question
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