Electrical And Environmental 2A656 Volume 4

74 Questions | Total Attempts: 1152

SettingsSettingsSettings
Electrical And Environmental 2A656 Volume 4 - Quiz

Electrical, environmental 2a656 volume 4 test feb 2011


Questions and Answers
  • 1. 
    (601) Each of these examples of aircraft systems use engine bleed air except
    • A. 

      anti-G.

    • B. 

      anti-icing.

    • C. 

      Rain removal.

    • D. 

      Fire extinguishing.

  • 2. 
    (601) The engine section from which bleed air is usually taken is the  
    • A. 

      Intake.

    • B. 

      Turbine.

    • C. 

      Exhaust.

    • D. 

      Compressor.

  • 3. 
    (601) Aircraft engine temperature and pressure as it applies to the bleed air system is determined by the
    • A. 

      Ambient pressure and ambient temperature.

    • B. 

      Ambient pressure and engine throttle setting.

    • C. 

      Engine throttle setting and ambient altitude.

    • D. 

      Engine throttle setting and ambient temperature

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

      Themocouple.

    • B. 

      Fuel control valve.

    • C. 

      Load control valve.

    • D. 

      Bleed air control governor.

  • 5. 
    (601) Engine bleed air check valves are installed to
    • A. 

      Prevent the loss of bleed air.

    • B. 

      Provide a primary source for bleed air.

    • C. 

      Maintain a balance airflow from each engine.

    • D. 

      Reduce bleed air pressure when the pressure is to high.

  • 6. 
    (602) What 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. 
    (602) What happens if electrical power is interrupted to the solenoid of an electrically-controlled,pneumatically-operated air-conditioning system shutoff valve that has a fail-safe feature?  
    • A. 

      The valve opens.

    • B. 

      The valve closes.

    • C. 

      If closed, the valve opens; if open, the valve closes.

    • D. 

      The valve opens or closes depending on system design requirements.

  • 8. 
    (602) What is the pressure and flow control device that restricts airflow and protects aircraft engines against air starvation?
    • A. 

      Orifice.

    • B. 

      Air regulator.

    • C. 

      Pressure limiter.

    • D. 

      Pressure regulator.

  • 9. 
    (602) Due to a loss of energy, the outlet air pressure of an orifice is
    • A. 

      Lower than the inlet.

    • B. 

      Higher than the inlet.

    • C. 

      Lower than the throat.

    • D. 

      The same as the throat.

  • 10. 
    (602) The amount of airflow through a pressure limiter is effected by each of these except
    • A. 

      Inlet pressure.

    • B. 

      Outlet pressure.

    • C. 

      Inlet temperature.

    • D. 

      Differential pressure.

  • 11. 
    (602) The flow control valve control 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 throat of the venturi.

    • C. 

      Outlet and inlet of the venturi.

    • D. 

      Inlet, outlet, and throat of the venturi.

  • 12. 
    (602) To remedy the limitations of a flow control valve, which bleed air system component is usually installed upstream of the flow control valve?
    • A. 

      Metering valve.

    • B. 

      Pressure limiter.

    • C. 

      System shutoff valve.

    • D. 

      Pressure regulator and shutoff valve.

  • 13. 
    (602) The air-controlling component that reduces high pressure engine bleed air to a lower constant pressure for the flow control valve is the
    • A. 

      Butterfly valve.

    • B. 

      Pressure limiter.

    • C. 

      Pressure regulator.

    • D. 

      System shutoff valve.

  • 14. 
    (602) The lockout butterfly of the airflow regulator has an offset center of rotation. This design gives the butterfly a pressure that is unbalanced towards which position?
    • A. 

      Open.

    • B. 

      Closed.

    • C. 

      Locked.

    • D. 

      Unlocked.

  • 15. 
    (602) The downstream air temperature of the bleed air air-conditioning system has exceeded the predetermined temperature. This has caused the butterfly to close. What flow control and shutoff valve component will now open?
    • A. 

      Thermal switch.

    • B. 

      Fusible switch.

    • C. 

      Breakaway switch.

    • D. 

      Pneumatic switch.

  • 16. 
    (603) When installing air-conditioning ducting, what tool is used to ensure alignment and sealing?
    • A. 

      Screwdriver.

    • B. 

      Center punch.

    • C. 

      Rawhide mallet.

    • D. 

      Ball peen hammer.

  • 17. 
    (603) While installing a bleed air system bolted flanged face duct end, you use a new crush-type 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 did you overlook?
    • A. 

      A sealing compound was not used with the gaskets.

    • B. 

      Flange bolts were not torqued in the proper sequence.

    • C. 

      The flange was not tapped with a rawhide mallet while torquing.

    • D. 

      Gasket should have been installed before cradle bolts were installed.

  • 18. 
    (603) What important fact must you remember when replacing gaskets used in aircraft ducting?
    • A. 

      Only replace gaskets if they are distorted.

    • B. 

      Always replace a gasket each time it is removed.

    • C. 

      Only replace gaskets in high-pressure/high-temperature ducting.

    • D. 

      Always reuse a gasket because it is already shaped to fit the ducts.

  • 19. 
    (603) What type of high-pressure/high-temperature ducting does not require a gasket?
    • A. 

      Clamp flange.

    • B. 

      Bolted flange.

    • C. 

      Beaded flange.

    • D. 

      Compressible flange.

  • 20. 
    (603) What corrective action should be taken when a compressible flange duct end becomes distorted?
    • A. 

      Replace the duct flange ends.

    • B. 

      Use a gasket with the duct ends.

    • C. 

      Reposition the duct for better sealing.

    • D. 

      Reshape the duct flange ends to its original shape.

  • 21. 
    (603) Which lubricant can be used on a beaded channel clamp sleeve to ease installation?
    • A. 

      Soap

    • B. 

      Water

    • C. 

      Grease

    • D. 

      Silicone

  • 22. 
    (603) Expansion joints in bleed air systems are best used on
    • A. 

      Ram air ducting.

    • B. 

      Long runs of ducting.

    • C. 

      Low-pressure ducting.

    • D. 

      Short runs of ducting.

  • 23. 
    (604) Leaks can best be detected during an operational check of the bleed air distribution system by
    • A. 

      Listening and feeling.

    • B. 

      Using an ultrasonic leak detector only.

    • C. 

      Feeling only because leaking air may be hot.

    • D. 

      Listening only because leaking air may be at high pressure.

  • 24. 
    24. (604) Bleed air leaks are permissible
    • A. 

      Around valve shafts.

    • B. 

      At low-pressure connections.

    • C. 

      Before the bleed air engine tapoff.

    • D. 

      On the bleed air ducting center wing section.

  • 25. 
    (604) You perform a bleed air system leakage check using the pressure decay method with an aircraft engine; the time for the pressure to drop 30 pounds per square inch (psi) took 11 seconds.This indicates that the system leakage test
    • A. 

      Needs to be repeated.

    • B. 

      Results are dangerously excessive.

    • C. 

      Results are below allowable limits.

    • D. 

      Results are within allowable limits.

Back to Top Back to top