2A672 Volume 2 Ure (Aircraft) Questions

80 Questions | Total Attempts: 2628

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2A672 Volume 2 Ure (Aircraft) Questions

A person aiming to become aerospace ground equipment journeyman is charged with diagnosing any malfunctions and repairing the equipment. Before they assign a person to repair the equipment they should ensure that they perform troubleshooting on the equipment. Give the question below on volume two a try before beginning on the next volume.


Questions and Answers
  • 1. 
    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?
    • A. 

      28 V to aircraft

    • B. 

      Neutral

    • C. 

      Bypass

    • D. 

      Loop

  • 2. 
    Which of the following components provides 525 VAC to the control transformer of the EPU-6/E frequency converter?
    • A. 

      Input auto transformer

    • B. 

      Output auto transformer

    • C. 

      Input phase sequence transformer

    • D. 

      Output phase sequence transformer

  • 3. 
    What EPU-6/E 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

  • 4. 
    The control transformer perform on the EPU-6/E frequency converter provides
    • A. 

      28 VDC for the aircraft contactor

    • B. 

      240 VDC for the aircraft contactor

    • C. 

      120 VAC for the operation of E and F line 28 VDC power supply

    • D. 

      240 VAC for operation of E and F line 28 VDC power supply

  • 5. 
    What EPU-6/E frequency converter components 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

  • 6. 
    During operation you determine that there is an undervoltage fault problem with the EPU-6/E frequency converter unit.  What component could be malfunctioning?
    • A. 

      Analog board has failed

    • B. 

      Output trim potentiometer is centered

    • C. 

      Voltage control board potentiometer is shorted

    • D. 

      Audible alarm switch is in the silence position

  • 7. 
    During operation of the EPU-6/E frequency converter you determine that one phase voltage is lower than the other two phases.  What could cause this malfunction?
    • A. 

      Malfunctioning transister

    • B. 

      Burnt control transformer fuse

    • C. 

      Improper SCR firing adjustment

    • D. 

      Loose push-on connector on the output filter capacitor

  • 8. 
    What -95 gas turbine compressor section supplies high-volume, low-pressure air for combustion, cooling, and bleed air output?
    • A. 

      Turbine section

    • B. 

      Accessory section

    • C. 

      Compressor section

    • D. 

      Air regulator section

  • 9. 
    The function of the deswirl ring on the -95 gas turbine compressor is to
    • A. 

      Accelerate air

    • B. 

      Increase air pressure

    • C. 

      Decrease air velocity

    • D. 

      Smooth turbulent air flow

  • 10. 
    What -95 component isolates the second-stage air from the operation of the first-stage compressor?
    • A. 

      Interstage ducts

    • B. 

      Interstage seal

    • C. 

      Impellers

    • D. 

      Inducers

  • 11. 
    What prevents overpressurization of the bearing cavity on a -95?
    • A. 

      Oil jet

    • B. 

      Oil cooler

    • C. 

      Scavenge pump

    • D. 

      Oil tank vent line

  • 12. 
    What -95 chambers are pressurized when the butterfly valve is closed?
    • A. 

      1 and 3

    • B. 

      2 and 4

    • C. 

      1, 2, and 3

    • D. 

      1, 3, and 4

  • 13. 
    The -95's rate-metering valve prevents the butterfly valve from snapping open by bleeding air through the atmospheric bleed port from chamber
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 14. 
    What -95 component 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 -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 its contacts did not remain closed

  • 16. 
    Refer to foldout 2.  During an ops check of a -95, 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. 
    Refer to foldout 2.  What -95 component energizes SV4?
    • A. 

      Master switch

    • B. 

      Air load valve

    • C. 

      Air load switch

    • D. 

      Oil pressure switch

  • 18. 
    What preliminary set-up step, if skipped, prevents the -95 from starting?
    • A. 

      Set-up controls

    • B. 

      Set parking brakes

    • C. 

      Open and secure the exhaust door

    • D. 

      Ensure the turbine air inlet and exhaust doors are free of obstructions

  • 19. 
    On the -95, discharge air pressure at 100 percent engine speed should indicate
    • A. 

      55 +2 psig

    • B. 

      45 +2 psig

    • C. 

      35 +2 psig

    • D. 

      25 +2 psig

  • 20. 
    Refer to foldout 2.  The -95 engine cranks but does not start.  What is the probable cause of this trouble?
    • A. 

      CB3 s open

    • B. 

      S9 is shorted

    • C. 

      SV1 coil is open

    • D. 

      K7 is not energized

  • 21. 
    The -95 does not shut down when the charging rate decreases to 12 amperes.  What is the probable cause of this trouble?
    • A. 

      Air load switch

    • B. 

      Fuel level relay K5

    • C. 

      2 speed solenoid SV4

    • D. 

      Battery charging module

  • 22. 
    When heat is applied to an ice cube and the ice starts to melt, it is
    • A. 

      Super heat

    • B. 

      Latent heat

    • C. 

      Sensible heat

    • D. 

      Convection heat

  • 23. 
    The three methods of heat transfer are
    • A. 

      Sensible, latent, and super heat

    • B. 

      Sensible, convection, and conduction

    • C. 

      Conduction, convection, and radiation

    • D. 

      Conduction, convection, and super heat

  • 24. 
    The air flowing through an air conditioner is also called
    • A. 

      Heat

    • B. 

      Heat load

    • C. 

      Pounds per minute (ppm)

    • D. 

      Cubic feet per minute (cfm)

  • 25. 
    While you are doing an ops check of an air conditioner, you notice the unit is short cycling.  What do you do to correct this trouble?
    • A. 

      Increase the heat load

    • B. 

      Lower the refrigerant charge

    • C. 

      Check the receiver outlet valve

    • D. 

      Decrease the setting of the LPCO

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