2A656 Vol. 4 Part 1

20 Questions | Total Attempts: 38

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2A656 Quizzes & Trivia

Questions and Answers
  • 1. 
    All of these aircraft systems use engine bleed air except
    • A. 

      Anti-gravity (anti-g)

    • B. 

      Fire-extinguishing

    • C. 

      Rain removal

    • D. 

      Anti-icing

  • 2. 
    Bleed air is usually taken from which aircraft engine section?
    • A. 

      Intake

    • B. 

      Turbine

    • C. 

      Exhaust

    • D. 

      Comrpressor

  • 3. 
    What is the approximate pressure and maximum temperature of engine bleed air as it is tapped from the engine compression section?
    • A. 

      100 pounds per square inch (psi) and 700F

    • B. 

      150 psi and 750 F

    • C. 

      200 psi and 900F

    • D. 

      250 psi and 950F

  • 4. 
    Which component determines the amount of bleed air bled from a gas turbine compressor (GTC)?
    • A. 

      Thermocouple

    • B. 

      Fuel control valve

    • C. 

      Load control valve

    • D. 

      Bleed air control governor 

  • 5. 
    What engine air valve prevents air from being lost through the engine when it is shutdown?
    • A. 

      Check

    • B. 

      Shutoff

    • C. 

      Isolation

    • D. 

      Crossover

  • 6. 
    Which component stops the flow of air to the air-conditioning system?
    • A. 

      Pressure limiter

    • B. 

      Flow control valve

    • C. 

      Air regulator valve

    • D. 

      System shutoff valve

  • 7. 
    If electrical power is interrupted to the solenoid of an electricity controlled, pneumatically operated air-conditioning system shutoff valve with a fail-safe feature, the valve
    • A. 

      Opens

    • B. 

      Closes

    • C. 

      Opens, if closed; closes if opened

    • D. 

      Opens and closes depending on system design requirements

  • 8. 
    Due to a loss of energy, the pressure is
    • A. 

      At h3 is slightly reduced

    • B. 

      At h3 slightly raised

    • C. 

      The same as the throat

    • D. 

      Lower than the throat

  • 9. 
    What is the bleed air system component that controls the airflow by protecting downstream components from excessive pressure?
    • A. 

      Orfice

    • B. 

      Pressure limiter

    • C. 

      Pressure regulator

    • D. 

      Flow control valve

  • 10. 
    The amount of airflow through a pressure limiter is affected by each of these except
    • A. 

      Inlet pressure

    • B. 

      Outlet pressure

    • C. 

      Inlet temperature

    • D. 

      Differential pressure

  • 11. 
    The butterfly valve of the air-conditioning pressure limiter is open when
    • A. 

      The upper limit is compressed

    • B. 

      There is not enough pressure applied to the system

    • C. 

      A force is applied downward on the actuator diaphragm

    • D. 

      The downstream pressure port receives 70 pounds per minute (ppm) airflow

  • 12. 
    The flow control valve in the bleed air air-conditioning system controls flow by maintaining a constant differential pressure between the
    • A. 

      Inlet and throat of the venturi

    • B. 

      Outlet and the inlet of the venturi

    • C. 

      Outlet and throat of the venturi

    • D. 

      Inlet, outlet, and throat of the venturi

  • 13. 
    Which air-conditioning component reduces high-pressure engine bleed air to a lower constant pressure for the flow control valve?
    • A. 

      Butterfly valve

    • B. 

      Pressure limiter

    • C. 

      Pressure regulator

    • D. 

      System shutoff valve

  • 14. 
    If the source pressure drops below the bleed air pressure regulator setting
    • A. 

      The flow control valve closes

    • B. 

      The pressure regulator closes

    • C. 

      All available air pressure is supplied to the flow control valve

    • D. 

      The air-conditioning system goes into a low-flow mode of operation

  • 15. 
    Which bleed air system component modulates to maintain a constant downstream air pressure?
    • A. 

      Pressure limiter

    • B. 

      Airflow regulator

    • C. 

      Pressure regulator

    • D. 

      Flow control valve

  • 16. 
    The lockout butterfly of the airflow regulator has an offset center of rotation. Towards which position does this design give the butterfly unbalanced pressure?
    • A. 

      Open

    • B. 

      Closed

    • C. 

      Locked

    • D. 

      Unlocked

  • 17. 
    After replacing a bleed air system air-conditioning airflow regulator fusible plug, you must also reset the
    • A. 

      Lockout butterfly

    • B. 

      Pneumatic switch

    • C. 

      Pneumatic thermostat

    • D. 

      Breakaway plug assembly

  • 18. 
    Aircraft high-pressure/high-temperature air-conditioning ducting is usually made of what type of material?
    • A. 

      Titanium

    • B. 

      Aluminum

    • C. 

      Stainless steel

    • D. 

      Aluminum/nickel alloy

  • 19. 
    What tool do you use to install a high-pressure/high-temperature V-band clamp to ensure it is aligned and sealed properly?
    • A. 

      Screwdriver

    • B. 

      Center punch

    • C. 

      Rawhide mallet

    • D. 

      Ball peen hammer

  • 20. 
    While installing a bleed air system bolted flanged duct end, use a metal or fiber gasket align the flange, and insert the bottom bolts first to form a cradle. Then, you install the remaining bolts and tighten all the nuts. After the installation is complete, you perform an operational check that reveals a leak. From the above information, what important procedure was overlooked?
    • A. 

      Sealant compound was not used with the gaskets

    • B. 

      Flange bolts were not torqued in the proper sequence

    • C. 

      Flange was not tapped with a rawhide mallet while torqueing

    • D. 

      Gasket should have been installed before cradle bolts were installed

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