An APU Quiz For All Aspiring Pilots And Plan Technicians Out There!

71 Questions | Attempts: 36

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An APU Quiz For All Aspiring Pilots And Plan Technicians Out There! - Quiz

An Auxiliary Power Unit or APU allows an aircraft to operate autonomously without reliance on ground support equipment such as a ground power unit, an external air-conditioning unit or a high pressure air start cart. Take this quiz to check your knowledge about the same!


Questions and Answers
  • 1. 
    What are you waiting for during the two-minute period during shuhtdown of the APU?
    • A. 

      Stabilization of the APU

    • B. 

      The oil pressure to drop within limits

    • C. 

      The bleed air ducts to cool down

    • D. 

      The APU load control valve to fully shut

  • 2. 
    What technical order covers the APU and it's operation?
    • A. 

      1C-130H-2-05JG-00-1

    • B. 

      1C-130H-2-49JG-00-1-1

    • C. 

      1C-130H-2-12JG-10-2

    • D. 

      1C-130H-2-71JG-00-1

  • 3. 
    The boost pump must be turned on when operating the APU with less than _______ pounds of fuel in the #2 tank
    • A. 

      4,000

    • B. 

      3,000

    • C. 

      2,000

    • D. 

      1,000

  • 4. 
    The minimum DC voltage for the aircraft's batteries are?
    • A. 

      21

    • B. 

      22

    • C. 

      24

    • D. 

      28

  • 5. 
    Where does the APU receive it's fuel from?
    • A. 

      The APU fuel tank

    • B. 

      The RH AUX tank

    • C. 

      The #2 main tank

    • D. 

      The fuel cross-feed manifold

  • 6. 
    Do not hold the agent discharge switch to #1 or #2 position for more than two seconds during emergency shutdown procedures, if there is a fire.
    • A. 

      True

    • B. 

      False

  • 7. 
    How is the APU fire detected?
    • A. 

      A flashing fire warning light and a steady light in the T-Handle

    • B. 

      A steady fire warning light and a steady light in the T-Handle

    • C. 

      A steady fire warning light and a flashing light in then T-Handle

    • D. 

      A flashing fire warning light and a flashing light in the T-Handle

  • 8. 
    The entire APU oil system hold approximately how many quarts of oil?
    • A. 

      2 US quarts

    • B. 

      3 US quarts

    • C. 

      6 US quarts

    • D. 

      5 US quarts

  • 9. 
    What is the APU starter duty cycle?
    • A. 

      1 minute on and 1 minute off

    • B. 

      1 minute on and 2 minutes off

    • C. 

      1 minute on and 3 minutes off

    • D. 

      1 minute on and 4 minutes off

  • 10. 
    What happens at 35% RPM during APU starting?
    • A. 

      The start light goes out

    • B. 

      The start light comes on

    • C. 

      The on speed light comes on

    • D. 

      The on speed light goes out

  • 11. 
    What happens at 95% RPM during APU starting?
    • A. 

      The APU automatically shuts down

    • B. 

      The over-speed light comes on

    • C. 

      The on-speed light comes on

    • D. 

      The on-speed light goes out

  • 12. 
    How many mechanics are required to operate the APU?
    • A. 

      One

    • B. 

      Two

    • C. 

      Three 

    • D. 

      Four

  • 13. 
    The area around the APU inlet door should be inspected for?
    • A. 

      Ice

    • B. 

      General APU condition

    • C. 

      Foreign Objects

    • D. 

      All of the above

  • 14. 
    The purpose of the APU is to provide _______.
    • A. 

      Hydraulic pressure for ground operation

    • B. 

      Electrical power for starting engines

    • C. 

      Electrical and hydraulic power to various sections of the aircraft

    • D. 

      Bleed air for engine starting and ground operations

  • 15. 
    Do not hold the AGENT DISCHARGE switch for more than ____ seconds or you may cause the fire extinguisher circuit breaker to trip.
    • A. 

      One

    • B. 

      Two

    • C. 

      Three 

    • D. 

      Four

  • 16. 
    What must be done before pressurizing the bleed air manifold?
    • A. 

      Clear the propeller area

    • B. 

      Check the ramp area

    • C. 

      Close the #2 fuel cross-feed

    • D. 

      Call for clearance from the control tower

  • 17. 
    What is the purpose of draining the fuel strainer sump prior to the first start of the day?
    • A. 

      To check the fuel for contamination and water

    • B. 

      To ensure the APU has proper fuel flow

    • C. 

      To ensure the APU fuel shut-off valve is in the open position

    • D. 

      To ensure the APU fuel shut-off valve is in the closed position

  • 18. 
    If while testing the bleed air pressure ducts, on aircraft prior to AF83-0486 except planes modified by TO 1C-130-1653, the time of the pressure drop is 8.5 seconds or greater, you should _____________
    • A. 

      Try to isolate the problem to aid in troubleshooting

    • B. 

      Not operate the bleed air

    • C. 

      Shut down the APU

    • D. 

      Do nothing, it is within limits

  • 19. 
    Where is the bleed air manifold pressure gauge located?
    • A. 

      On the overhead electrical panel

    • B. 

      Near the Navigator's control station

    • C. 

      On the pilot's main instrument panel

    • D. 

      Aft of the left troop door

  • 20. 
    Normally which radio is used for emergency communications?
    • A. 

      ADF

    • B. 

      HF

    • C. 

      SCNS

    • D. 

      UHF

  • 21. 
    What is the quantity of the APU oil system and tank?
    • A. 

      3 US Quarts

    • B. 

      4 US Quarts

    • C. 

      5 US Quarts

    • D. 

      6 US Quarts

  • 22. 
    The start light should go out within _____ minutes
    • A. 

      One

    • B. 

      Two

    • C. 

      Three

    • D. 

      Four

  • 23. 
    If the start light doesn't go out within its specified time, the APU will be shut down and allowed to cool for _____ minute(s)
    • A. 

      One

    • B. 

      Two

    • C. 

      Three

    • D. 

      Four

  • 24. 
    Exceeding what percent RPM will cause the APU to shutdown and possibly re-light with a loud bang?
    • A. 

      35% speed switch

    • B. 

      95% speed switch

    • C. 

      105% speed switch

    • D. 

      110% speed switch

  • 25. 
    If the APU fire warning system is not operating properly ________.
    • A. 

      Do not operate the APU

    • B. 

      Have ground man monitor APU and proceed

    • C. 

      Have an extra person visually monitor the APU

    • D. 

      Document aircraft forms and proceed with caution

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