2A672 Code 6 Volume 2 UREs Complete

38 Questions | By Dunlapryan | Updated: Mar 22, 2022 | Attempts: 264

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Frequency converter machine

Questions and Answers

1.

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

What components receive potential directly from the input 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
3.

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
4.

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
5.

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?
- 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
6.

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
7.

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
8.

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.

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
10.

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.

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
12.

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
13.

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.

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 speed switch
15.

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?
- 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.

Refer to foldout 2. What component on the A/M32A-95 gas turbine compressor energizes SV4?
- A.
  
  Master switch
- B.
  
  Air load valve
- C.
  
  Air load switch
- D.
  
  Oil pressure switch
17.

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 outlets are free of obstructions
18.

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?
- A.
  
  SV2
- B.
  
  S10
- C.
  
  TD2
- D.
  
  K6
19.

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
20.

Refer to foldout 2. The A/M32A-95 gas turbine compressor cranks but doesn't start. What is the probable cause of this trouble?
- A.
  
  CB3 open
- B.
  
  S9 shorted
- C.
  
  SV1 coil is open
- D.
  
  K7 not energizing
21.

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
- 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 cooling
22.

What component on an MA-3D air conditioner increases the ambient air temperature approximately 60 degrees Fahrenheit?
- A.
  
  Blower
- B.
  
  Compressor
- C.
  
  Evaporator
- D.
  
  Aftercooler
23.

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 boiling point of refrigerant must be increased to increase output air temp
24.

The heat sink on the MA-3D air conditioner
- 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.

You place the MA-3D air conditioner SW1 in the START position, but the engine does not operate. What is the probable cause?
- A.
  
  K7 contacts are closed
- B.
  
  Overspeed switch is closed
- C.
  
  Override switch is not closed
- D.
  
  Oil pressure switch is closed