2A656 Vol. 4 Part 1
(13).webp "2A656 Vol. 4 Part 1 - Quiz")
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
Correct Answer
B. Fire-extinguishing -
- 2.
Bleed air is usually taken from which aircraft engine section?
- A.
Intake
- B.
Turbine
- C.
Exhaust
- D.
Comrpressor
Correct Answer
D. ComrpressorExplanation
Bleed air is usually taken from the compressor section of an aircraft engine. The compressor is responsible for compressing incoming air before it enters the combustion chamber. Bleed air is extracted from the compressor at various stages and used for various purposes, such as cabin pressurization, anti-icing, and operating pneumatic systems.Rate this question:
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- 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
Correct Answer
C. 200 psi and 900FExplanation
The approximate pressure and maximum temperature of engine bleed air as it is tapped from the engine compression section is 200 psi and 900F.Rate this question:
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- 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
Correct Answer
C. Load control valveExplanation
The load control valve determines the amount of bleed air bled from a gas turbine compressor (GTC). This valve regulates the flow of bleed air based on the load requirements of the system. By adjusting the position of the valve, the amount of bleed air can be controlled to meet the specific needs of the system, ensuring optimal performance and efficiency. The other options listed, such as the thermocouple, fuel control valve, and bleed air control governor, are not directly responsible for determining the amount of bleed air bled from the compressor.Rate this question:
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- 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
Correct Answer
B. ShutoffExplanation
The engine air valve that prevents air from being lost through the engine when it is shutdown is called the shutoff valve. This valve is designed to close off the air supply to the engine, ensuring that no air escapes when the engine is not in use. By preventing air loss, the shutoff valve helps to maintain the integrity and efficiency of the engine system.Rate this question:
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- 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
Correct Answer
D. System shutoff valveExplanation
The system shutoff valve is the component that stops the flow of air to the air-conditioning system. This valve is responsible for completely closing off the air supply, preventing any air from entering the system. By shutting off the flow of air, the system shutoff valve helps to control the operation of the air-conditioning system and ensures that it only functions when needed.Rate this question:
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- 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
Correct Answer
D. Opens and closes depending on system design requirementsExplanation
If electrical power is interrupted to the solenoid of the shutoff valve, the valve will open and close depending on the design requirements of the system. This means that the valve may either open or close when the power is interrupted, depending on how the system is designed to function in such situations.Rate this question:
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- 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
Correct Answer
A. At h3 is slightly reducedExplanation
At h3, the pressure is slightly reduced. This is because as the fluid flows through the throat, there is a decrease in the cross-sectional area, causing an increase in the fluid velocity according to Bernoulli's principle. As the fluid velocity increases, the pressure decreases. Therefore, at h3, where the fluid has passed through the throat, the pressure is slightly reduced compared to the throat.Rate this question:
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- 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
Correct Answer
B. Pressure limiterExplanation
A pressure limiter is a component in the bleed air system that controls the airflow by protecting downstream components from excessive pressure. It limits the pressure to a safe level, preventing damage to the system and ensuring that the airflow is regulated properly. This component is crucial in maintaining the overall integrity and functionality of the bleed air system.Rate this question:
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- 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
Correct Answer
B. Outlet pressureExplanation
The amount of airflow through a pressure limiter is affected by the inlet pressure, inlet temperature, and differential pressure. However, the outlet pressure does not affect the airflow.Rate this question:
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- 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
Correct Answer
B. There is not enough pressure applied to the systemExplanation
When there is not enough pressure applied to the system, the butterfly valve of the air-conditioning pressure limiter remains open. This means that the valve allows airflow to pass through it, as there is insufficient pressure to close it.Rate this question:
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- 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
Correct Answer
A. Inlet and throat of the venturiExplanation
The correct answer is "inlet and throat of the venturi". In a bleed air air-conditioning system, the flow control valve is responsible for controlling the flow of air. It does this by maintaining a constant differential pressure between the inlet and throat of the venturi. This means that the valve adjusts the flow rate to ensure that there is a consistent pressure difference between these two points. By doing so, the valve can regulate the airflow and ensure that the system operates efficiently.Rate this question:
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- 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
Correct Answer
C. Pressure regulatorExplanation
A pressure regulator is a component in an air-conditioning system that reduces high-pressure engine bleed air to a lower constant pressure for the flow control valve. This helps to maintain a consistent pressure and prevent damage to the system. The pressure regulator ensures that the air flow is controlled and regulated effectively, allowing for optimal performance of the air-conditioning system.Rate this question:
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- 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
Correct Answer
C. All available air pressure is supplied to the flow control valveExplanation
When the source pressure drops below the bleed air pressure regulator setting, the pressure regulator closes. This means that it stops regulating the pressure and allows all available air pressure to be supplied to the flow control valve. As a result, the flow control valve receives maximum air pressure, allowing it to control and regulate the flow of air effectively. This ensures that the air-conditioning system can operate in a low-flow mode, where the flow of air is adjusted to meet the specific requirements of the system.Rate this question:
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- 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
Correct Answer
B. Airflow regulatorExplanation
The airflow regulator is responsible for modulating the bleed air system to maintain a constant downstream air pressure. It adjusts the airflow to ensure that the pressure remains consistent, regardless of any fluctuations in the system. This component plays a crucial role in maintaining the stability and efficiency of the bleed air system.Rate this question:
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- 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
Correct Answer
B. ClosedExplanation
The lockout butterfly of the airflow regulator has an offset center of rotation. This means that when the butterfly is in the closed position, the offset center of rotation creates an unbalanced pressure on the butterfly. Therefore, the design gives the butterfly unbalanced pressure when it is in the closed position.Rate this question:
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- 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
Correct Answer
B. Pneumatic switchExplanation
After replacing a bleed air system air-conditioning airflow regulator fusible plug, you must also reset the pneumatic switch. The pneumatic switch controls the flow of air in the system. When the fusible plug is replaced, it is necessary to reset the pneumatic switch to ensure proper functioning of the air-conditioning system. This will allow the air to flow correctly and maintain the desired temperature in the aircraft.Rate this question:
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- 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
Correct Answer
C. Stainless steelExplanation
Aircraft high-pressure/high-temperature air-conditioning ducting is usually made of stainless steel because it is a strong and durable material that can withstand the high pressures and temperatures experienced in the aircraft's air conditioning system. Stainless steel is also resistant to corrosion, which is important for maintaining the integrity of the ducting over time.Rate this question:
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- 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
Correct Answer
C. Rawhide malletExplanation
A rawhide mallet is used to install a high-pressure/high-temperature V-band clamp because it is a soft-faced hammer that provides a controlled and gentle impact. The soft rawhide material prevents damage to the clamp and ensures that it is aligned and sealed properly without causing any deformation or distortion. Using a rawhide mallet allows for precise installation of the clamp, ensuring a secure and leak-free connection.Rate this question:
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- 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
Correct Answer
B. Flange bolts were not torqued in the proper sequenceExplanation
The important procedure that was overlooked is that the flange bolts were not torqued in the proper sequence. This means that the bolts were not tightened in the correct order, which could have resulted in uneven pressure distribution and ultimately led to the leak in the system.Rate this question:
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