Electrical And Environmental 2A656 Volume 4

74 Questions | By Gdobby | Last updated: Mar 18, 2022 | Total Attempts: 1152

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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.