2A656 Vol. 4 Part 1
- 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
Questions: 376 | Attempts: 6401 | Last updated: Mar 21, 2022
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