2A672 Code 6 Volume 2 UREs Complete

38 Questions | Total Attempts: 194

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2A672 Quizzes & Trivia

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

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