Electrical And Environmental 2A656 Volume 4
(61).jpg "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.
Correct Answer
D. Fire extinguishing.Explanation
Engine bleed air is used in aircraft systems for various purposes, such as providing air for anti-icing, rain removal, and anti-G systems. However, it is not used for fire extinguishing. Fire extinguishing systems in aircraft typically rely on other methods, such as fire suppression agents or halon gas, rather than engine bleed air. Therefore, the correct answer is fire extinguishing.Rate this question:
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- 2.
(601) The engine section from which bleed air is usually taken is the
- A.
Intake.
- B.
Turbine.
- C.
Exhaust.
- D.
Compressor.
Correct Answer
D. Compressor.Explanation
Bleed air is usually taken from the compressor section of the engine. The compressor is responsible for compressing the incoming air before it enters the combustion chamber. This compressed air is then used for various purposes, such as aircraft pressurization, air conditioning, and anti-icing. Taking bleed air from the compressor section ensures that it is at a high enough pressure and temperature to be used effectively for these purposes.Rate this question:
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- 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
Correct Answer
D. Engine throttle setting and ambient temperatureExplanation
The temperature and pressure of the aircraft engine in relation to the bleed air system are influenced by the engine throttle setting and the ambient temperature. The engine throttle setting determines the amount of air being drawn into the engine, which affects the temperature and pressure. The ambient temperature also plays a role in determining the temperature and pressure of the air entering the engine.Rate this question:
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- 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.
Correct Answer
C. Load control valve.Explanation
The load control valve is the component that determines the amount of bleed air bled from a gas turbine compressor (GTC). It regulates the flow of bleed air based on the load requirements of the system. The thermocouple measures temperature, the fuel control valve regulates fuel flow, and the bleed air control governor maintains constant pressure in the bleed air system. Therefore, the load control valve is the correct answer as it specifically controls the amount of bleed air.Rate this question:
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- 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.
Correct Answer
A. Prevent the loss of bleed air.Explanation
Engine bleed air check valves are installed to prevent the loss of bleed air. These valves are designed to ensure that the high-pressure bleed air from the engine does not escape unintentionally. By preventing the loss of bleed air, these check valves help maintain the proper functioning of various aircraft systems that rely on bleed air, such as air conditioning, pressurization, and anti-ice systems.Rate this question:
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- 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.
Correct Answer
D. System shutoff valve.Explanation
The system shutoff valve is the component that stops the flow of air to the air-conditioning system. It is responsible for controlling the flow of refrigerant and preventing it from entering the system when necessary, such as during maintenance or repairs. This valve is typically located near the compressor or in the high-pressure line, and it can be manually operated or controlled by the air-conditioning system itself. Its main function is to ensure the safety and efficiency of the air-conditioning system by allowing for proper maintenance and preventing damage to the system.Rate this question:
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- 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.
Correct Answer
D. The valve opens or closes depending on system design requirements.Explanation
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, the valve will either open or close depending on the design requirements of the system. The fail-safe feature ensures that the valve will move to a specific position in the event of a power failure, which could be either open or closed depending on the desired safety mechanism of the system.Rate this question:
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- 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.
Correct Answer
A. Orifice.Explanation
An orifice is a pressure and flow control device that restricts airflow. It is used to protect aircraft engines against air starvation by regulating the amount of air that enters the engine. By restricting the airflow, the orifice ensures that the engine receives a consistent and controlled supply of air, preventing any damage or issues that could arise from air starvation.Rate this question:
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- 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.
Correct Answer
A. Lower than the inlet.Explanation
When fluid flows through an orifice, there is a loss of energy due to factors such as friction and turbulence. This loss of energy causes a decrease in pressure. Therefore, the outlet air pressure of an orifice is lower than the inlet pressure.Rate this question:
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- 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.
Correct Answer
B. Outlet pressure.Explanation
The amount of airflow through a pressure limiter is affected by several factors, including inlet pressure, inlet temperature, and differential pressure. However, the one factor that does not have an impact on the airflow is the outlet pressure. The outlet pressure is the pressure at which the fluid exits the pressure limiter, and it does not influence the amount of airflow passing through the device.Rate this question:
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- 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.
Correct Answer
A. Inlet and throat of the venturi.Explanation
The correct answer is "inlet and throat of the venturi." In a bleed air air-conditioning system, the flow control valve controls the flow by maintaining a constant differential pressure between the inlet and throat of the venturi. This means that the valve adjusts the flow rate of the air entering the venturi based on the pressure difference between the inlet and throat, ensuring that the desired flow is maintained. The outlet of the venturi is not mentioned in relation to the flow control valve, so it is not part of the correct answer.Rate this question:
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- 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.
Correct Answer
D. Pressure regulator and shutoff valve.Explanation
A pressure regulator and shutoff valve is usually installed upstream of the flow control valve to remedy its limitations. This component helps regulate and control the pressure of the air flow, ensuring that it is at the desired level before entering the flow control valve. Additionally, the shutoff valve allows for complete shut off of the air flow when needed.Rate this question:
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- 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.
Correct Answer
C. Pressure regulator.Explanation
The air-controlling component that reduces high pressure engine bleed air to a lower constant pressure for the flow control valve is the pressure regulator. This component is responsible for maintaining a consistent and safe pressure level in the system by regulating the flow of air. It ensures that the pressure is reduced to the appropriate level before it reaches the flow control valve, allowing for efficient and controlled airflow in the engine.Rate this question:
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- 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.
Correct Answer
B. Closed.Explanation
The lockout butterfly of the airflow regulator has an offset center of rotation, which means that the butterfly is not evenly balanced. When the butterfly is in the closed position, the offset center of rotation creates an unbalanced pressure that helps to keep the butterfly securely closed. Therefore, the correct answer is closed.Rate this question:
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- 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.
Correct Answer
A. Thermal switch.Explanation
When the downstream air temperature of the bleed air air-conditioning system exceeds the predetermined temperature, the butterfly valve closes. In order to prevent any damage or overheating, a thermal switch is activated. This thermal switch will then open the flow control and shutoff valve component to allow for proper cooling and regulation of the air temperature.Rate this question:
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- 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.
Correct Answer
C. Rawhide mallet.Explanation
A rawhide mallet is used when installing air-conditioning ducting to ensure alignment and sealing. This type of mallet is made from rawhide material, which is soft and non-damaging to the ducting. It allows for precise adjustments and helps to create a tight seal between the ducting components. A screwdriver, center punch, and ball peen hammer are not suitable for this task as they can cause damage to the ducting or result in misalignment.Rate this question:
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- 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.
Correct Answer
B. Flange bolts were not torqued in the proper sequence.Explanation
The important procedure that was overlooked is that the flange bolts were not torqued in the proper sequence. Torquing the bolts in the correct sequence is crucial to ensure even pressure and proper sealing of the flange. This could have resulted in a leak during the operational check.Rate this question:
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- 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.
Correct Answer
B. Always replace a gasket each time it is removed.Explanation
When replacing gaskets used in aircraft ducting, it is important to remember to always replace the gasket each time it is removed. This is because gaskets can become worn or damaged over time, and reusing them may result in leaks or other issues. Therefore, it is necessary to install a new gasket to ensure proper sealing and prevent any potential problems in the ducting system.Rate this question:
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- 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.
Correct Answer
D. Compressible flange.Explanation
A compressible flange is a type of high-pressure/high-temperature ducting that does not require a gasket. This type of flange is designed with a compressible material, such as rubber, that creates a tight seal when the flange is bolted together. The compressible material allows for flexibility and compensates for any irregularities or misalignments in the flange connection, eliminating the need for a separate gasket. This makes the compressible flange a convenient and cost-effective option for high-pressure/high-temperature applications.Rate this question:
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- 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.
Correct Answer
D. Reshape the duct flange ends to its original shape.Explanation
When a compressible flange duct end becomes distorted, the correct corrective action is to reshape the duct flange ends to its original shape. This means that the distorted flange ends should be carefully manipulated and reshaped back to their original form. This is important for ensuring a proper seal and preventing any leaks or inefficiencies in the duct system.Rate this question:
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- 21.
(603) Which lubricant can be used on a beaded channel clamp sleeve to ease installation?
- A.
Soap
- B.
Water
- C.
Grease
- D.
Silicone
Correct Answer
B. WaterExplanation
Water can be used as a lubricant on a beaded channel clamp sleeve to ease installation. Water reduces friction between the sleeve and the surface, making it easier to slide the sleeve into place. It acts as a temporary lubricant that allows for smooth and effortless installation.Rate this question:
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- 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.
Correct Answer
D. Short runs of ducting.Explanation
Expansion joints in bleed air systems are best used on short runs of ducting. This is because expansion joints are designed to absorb the thermal expansion and contraction of the ducting caused by the high temperatures of the bleed air. Short runs of ducting experience less thermal expansion and contraction compared to long runs, making them more suitable for the use of expansion joints. Additionally, expansion joints are typically used in low-pressure ducting systems, as the high pressures in the system can cause the joints to fail. Therefore, short runs of low-pressure ducting are the ideal application for expansion joints in bleed air systems.Rate this question:
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- 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.
Correct Answer
A. Listening and feeling.Explanation
During an operational check of the bleed air distribution system, leaks can be best detected by both listening and feeling. Listening can help identify any abnormal hissing or whistling sounds that may indicate a leak, while feeling for any air movement or temperature changes can also indicate the presence of a leak. Using both senses together provides a more comprehensive approach to detecting leaks in the system.Rate this question:
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- 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.
Correct Answer
A. Around valve shafts.Explanation
Bleed air leaks are permissible around valve shafts.Rate this question:
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- 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.
Correct Answer
D. Results are within allowable limits.Explanation
The correct answer is "results are within allowable limits." The pressure decay method is used to check for leakage in the bleed air system of an aircraft engine. In this case, the pressure dropped 30 psi in 11 seconds, which indicates that the leakage is within the allowable limits. If the leakage was dangerously excessive or if the test needed to be repeated, the pressure would have dropped at a faster rate.Rate this question:
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- 26.
(605) Low engine pressure ratio (EPR) could be caused by a bleed air system that has
- A.
An orifice that is defective.
- B.
A clamp that has been improperly installed.
- C.
A precooler air ejector valve that is defective.
- D.
A pressure regulator that is installed backwards.
Correct Answer
B. A clamp that has been improperly installed.Explanation
Low engine pressure ratio (EPR) refers to a lower than normal ratio between the pressure at the engine inlet and the pressure at the engine exhaust. In this case, the correct answer suggests that a clamp that has been improperly installed could be the cause of the low EPR. Improper installation of the clamp may result in a leak in the bleed air system, causing a decrease in pressure and subsequently leading to a low EPR.Rate this question:
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- 27.
(605) An excessive pressure in the bleed air system can cause an unusually high cockpit temperature due to
- A.
A bleed air leak.
- B.
An over-speeding turbine.
- C.
High exhaust gas temperature.
- D.
A stuck open pressure relief valve.
Correct Answer
B. An over-speeding turbine.Explanation
An excessive pressure in the bleed air system can cause an unusually high cockpit temperature due to an over-speeding turbine. When the turbine spins too fast, it generates more heat, which can lead to higher temperatures in the cockpit. This can be caused by a malfunction or failure in the turbine's control system, resulting in an increase in pressure and speed.Rate this question:
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- 28.
(605) The bleed air pressure regulator is supplying the required pressure to the bleed air system, yet the cabin temperature is higher than normal. A system check indicates the cooling turbine is not receiving sufficient airflow to produce effective cooling. What would be the primary cause of the problem?
- A.
Pressure limiter.
- B.
Low system pressure.
- C.
Flow control valve.
- D.
High engine pressure ratio.
Correct Answer
C. Flow control valve.Explanation
The primary cause of the problem is likely the flow control valve. The bleed air pressure regulator is supplying the required pressure to the bleed air system, indicating that the pressure limiter and low system pressure are not the issue. The high engine pressure ratio may contribute to the problem, but it is not the primary cause. The fact that the cooling turbine is not receiving sufficient airflow suggests that the flow control valve, which regulates the flow of air to the cooling turbine, is not functioning properly.Rate this question:
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- 29.
(605) The small drill hole in the outlet of some engine bleed air shutoff valves serves to
- A.
Check the valve position.
- B.
Connect a pressure gage.
- C.
Relieve excess pressure.
- D.
Secure valve insulation.
Correct Answer
A. Check the valve position.Explanation
The small drill hole in the outlet of some engine bleed air shutoff valves serves to check the valve position. This hole allows the operator to visually inspect whether the valve is open or closed by observing the flow of air through the hole. It provides a simple and effective way to verify the position of the valve without the need for additional equipment or tools.Rate this question:
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- 30.
(606) An aircraft’s bleed air cooling air system pre-cooler is also known as the
- A.
Air cycle machine.
- B.
Contained air cooler.
- C.
Primary heat exchanger.
- D.
Regenerative temperature changer.
Correct Answer
C. Primary heat exchanger.Explanation
The correct answer is "primary heat exchanger." The pre-cooler in an aircraft's bleed air cooling air system is responsible for cooling the high-pressure air from the engine before it enters the air cycle machine. The primary heat exchanger is designed to efficiently transfer heat from the hot bleed air to the cooler ambient air, ensuring that the air entering the air cycle machine is at the correct temperature for cooling the aircraft's systems.Rate this question:
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- 31.
(606) A pre-cooler assembly is usually a self-contained cooling package with its own
- A.
Flow control system.
- B.
Safety control system.
- C.
Pressure control system.
- D.
Temperature control system.
Correct Answer
D. Temperature control system.Explanation
A pre-cooler assembly is a cooling package that is designed to lower the temperature of a fluid or gas. It is typically equipped with its own temperature control system to regulate and maintain the desired temperature. This system ensures that the fluid or gas being cooled is kept at the appropriate temperature for optimal performance and efficiency.Rate this question:
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- 32.
(606) Hot bleed air used for air-conditioning is cooled in a heat exchanger by
- A.
Ram air.
- B.
Rapid expansion.
- C.
Mixing bleed air with ram air.
- D.
Water flowing across the heat exchanger core.
Correct Answer
A. Ram air.Explanation
Hot bleed air used for air-conditioning is cooled in a heat exchanger by ram air. Ram air refers to the high-speed air that is forced into the heat exchanger to cool down the hot bleed air. This process takes advantage of the high velocity and lower temperature of the ram air to effectively cool the bleed air before it is used for air-conditioning purposes.Rate this question:
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- 33.
(606) The bleed air pre-cooler assembly maintains a constant outlet temperature with the aid of a
- A.
Sensor, modulating valve, and jet pump. sensor, temperature control circuit, and jet pump.
- B.
Sensor, temperature control circuit, and jet pump.
- C.
Modulating valve, sensor, and temperature control circuit.
- D.
Modulating valve, temperature control circuit, and jet pump.
Correct Answer
C. Modulating valve, sensor, and temperature control circuit.Explanation
The correct answer is "modulating valve, sensor, and temperature control circuit." The modulating valve helps regulate the flow of bleed air, while the sensor measures the outlet temperature. The temperature control circuit then adjusts the modulating valve based on the sensor readings to maintain a constant outlet temperature.Rate this question:
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- 34.
(606) To create a greater cooling effect, atomized water is sprayed across the inlet of the bleed air system secondary heat exchanger by the
- A.
Jet pump.
- B.
Jet sprayer.
- C.
Water aspirator.
- D.
Water separator.
Correct Answer
C. Water aspirator.Explanation
A water aspirator is used to create a greater cooling effect by spraying atomized water across the inlet of the bleed air system secondary heat exchanger. This device uses the Venturi effect to create a vacuum, which draws in and mixes the water with the air. As the water and air mix, the water evaporates and absorbs heat from the air, resulting in a cooling effect. This helps to efficiently cool the bleed air system secondary heat exchanger.Rate this question:
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- 35.
(606) Some cooling turbines have a pair of unused wires that are cut-off close to the turbine housing. What level of maintenance uses these wires?
- A.
Depot.
- B.
Squadron.
- C.
Intermediate.
- D.
Organizational.
Correct Answer
A. Depot.Explanation
The pair of unused wires that are cut-off close to the turbine housing are typically used for diagnostic purposes during maintenance. This level of maintenance, known as depot maintenance, involves more extensive repairs and overhauls that are performed at a centralized facility. Therefore, the correct answer is depot.Rate this question:
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- 36.
(606) One purpose of the fan in the bleed air system cooling turbine and fan assembly is to prevent
- A.
Excessive air flow.
- B.
Low system pressure.
- C.
Turbine over speeding.
- D.
Moisture in the cold air.
Correct Answer
C. Turbine over speeding.Explanation
The fan in the bleed air system cooling turbine and fan assembly prevents turbine over speeding. This is because the fan helps regulate the flow of air, ensuring that it does not exceed the safe operating speed of the turbine. By controlling the air flow, the fan prevents the turbine from spinning too fast and potentially causing damage or malfunctions.Rate this question:
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- 37.
(607) Bleed air system water separators remove 70 to 85 percent of the moisture that accumulates in the conditioned air. This is accomplished as a result of
- A.
Rapid expansion.
- B.
Regulated airflow.
- C.
Internal compression.
- D.
Regulated air pressure.
Correct Answer
B. Regulated airflow.Explanation
The correct answer is "regulated airflow" because the moisture in the conditioned air is removed by controlling the flow of air through the water separators. By regulating the airflow, the separators can effectively remove 70 to 85 percent of the moisture that accumulates in the air.Rate this question:
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- 38.
(607) The bleed air system water separator anti-icing system prevents the condenser bag from icing by keeping the turbine
- A.
Inlet temperature above 32°.
- B.
Inlet temperature below 32°.
- C.
Outlet temperature above 32°.
- D.
Outlet temperature below 32°.
Correct Answer
C. Outlet temperature above 32°.Explanation
The correct answer is "outlet temperature above 32°." The bleed air system water separator anti-icing system prevents the condenser bag from icing by maintaining the outlet temperature above 32°. This ensures that any moisture or water in the system does not freeze and cause blockages or damage.Rate this question:
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- 39.
(607) The bleed air system component that causes the aircraft cooling turbine to slow down when an icing condition occurs is the
- A.
Turbine bypass valve.
- B.
Ice control screen.
- C.
Anti-icing valve.
- D.
Anti-icing controller.
Correct Answer
B. Ice control screen.Explanation
The correct answer is the ice control screen. When an icing condition occurs, ice particles can be ingested into the bleed air system. The ice control screen is designed to prevent these ice particles from entering the cooling turbine. If ice particles were to enter the turbine, it could cause damage and slow down its operation. Therefore, the ice control screen plays a crucial role in maintaining the proper functioning of the aircraft cooling turbine during icing conditions.Rate this question:
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- 40.
(607) What air source ventilates the cockpit when smoke or fumes are discharged from the air-conditioning system?
- A.
Liquid air.
- B.
Compressed air.
- C.
Conditioned air.
- D.
Atmospheric air.
Correct Answer
D. Atmospheric air.Explanation
When smoke or fumes are discharged from the air-conditioning system, the cockpit is ventilated with atmospheric air. This means that the air from outside the aircraft is used to remove the smoke or fumes from the cockpit, ensuring the safety and well-being of the crew and passengers. The other options, such as liquid air, compressed air, and conditioned air, are not suitable for ventilating the cockpit in such situations.Rate this question:
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- 41.
(608) When a fighter aircraft air-conditioning system (ACS) is being operated on the ground, the ram air necessary to cool the bleed air flowing through the heat exchangers is provided by the
- A.
Airflow valve.
- B.
Ejector valve.
- C.
Ram air nozzle.
- D.
Air-to-air valve.
Correct Answer
B. Ejector valve. -
- 42.
(608) How is the warning light in the cockpit activated if duct pressure on a fighter air conditioning system becomes excessive?
- A.
Turbine overspeed switch.
- B.
Cabin temperature limiter.
- C.
Manual temperature limiter.
- D.
Pneumatic-thermal overheat switch.
Correct Answer
A. Turbine overspeed switch.Explanation
The warning light in the cockpit is activated if duct pressure on a fighter air conditioning system becomes excessive through the use of a turbine overspeed switch. This switch is designed to monitor the speed of the turbine and if it exceeds a certain threshold, it triggers the warning light to alert the pilot of the excessive pressure in the duct.Rate this question:
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- 43.
(608) The temperature of conditioned air going to the crew compartment depends on the position of the
- A.
Cabin air inlet valve.
- B.
Ground cooling ejector valve.
- C.
Water separator bypass valve.
- D.
Cabin dual-temperature mixing valve.
Correct Answer
D. Cabin dual-temperature mixing valve.Explanation
The temperature of conditioned air going to the crew compartment depends on the position of the cabin dual-temperature mixing valve. This valve controls the mixture of hot and cold air to achieve the desired temperature. By adjusting the position of the valve, the temperature of the conditioned air can be regulated accordingly.Rate this question:
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- 44.
(608) What air-conditioning component prevents excessive moisture from reaching the cockpit of a fighter aircraft?
- A.
Defog valve.
- B.
Anti-ice valve.
- C.
Water separator.
- D.
Cabin dual-temperature mixing valve.
Correct Answer
C. Water separator.Explanation
The correct answer is water separator. In a fighter aircraft, the water separator is an air-conditioning component that prevents excessive moisture from reaching the cockpit. It separates the water vapor from the air, ensuring that only dry air enters the cockpit. This is important as excessive moisture can lead to fogging and reduce visibility in the cockpit, which can be dangerous during flight operations. Therefore, the water separator plays a crucial role in maintaining a clear and safe cockpit environment.Rate this question:
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- 45.
(608) Which cabin safety device prevents a fighter air-conditioning system from overheating?
- A.
Overheat switch.
- B.
Temperature sensor.
- C.
Temperature control switch.
- D.
Manual temperature limiter.
Correct Answer
D. Manual temperature limiter.Explanation
The manual temperature limiter is the cabin safety device that prevents a fighter air-conditioning system from overheating. It is designed to regulate and limit the temperature within the system, ensuring that it does not exceed safe levels. This device helps to maintain the proper functioning and efficiency of the air-conditioning system, preventing any potential damage or hazards caused by overheating.Rate this question:
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- 46.
(609) Bleed air inlet pressure is maintained at 40 pounds per square inch gage (psig—at sea level) on a bomber air-conditioning system (ACS) by the
- A.
Pressure limiter.
- B.
ACS flow control and shutoff valve.
- C.
ACS pressure regulator and shutoff valve.
- D.
Cabin temperature control system pressure regulator and shutoff valve.
Correct Answer
C. ACS pressure regulator and shutoff valve.Explanation
The correct answer is ACS pressure regulator and shutoff valve. The ACS pressure regulator and shutoff valve is responsible for maintaining the bleed air inlet pressure at 40 pounds per square inch gage (psig) on the bomber air-conditioning system (ACS). This valve regulates the flow of air into the system and shuts off the air supply when the desired pressure is reached. It ensures that the air-conditioning system operates at the correct pressure to provide effective cooling and ventilation.Rate this question:
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- 47.
(609) When pressure is high enough to cause a bomber air-conditioning expansion turbine to exceed 110 percent of its maximum operating speed, the
- A.
Cold air and flow control valves close.
- B.
Cabin temperature control system (CTCS) pressure regulator/shutoff and cold air valves close.
- C.
Flow control/shutoff and air conditioning system (ACS) pressure regulator/shutoff valves close.
- D.
ACS pressure regulator/shutoff and CTCS pressure regulator/shutoff valves close.
Correct Answer
C. Flow control/shutoff and air conditioning system (ACS) pressure regulator/shutoff valves close.Explanation
When the pressure in the bomber air-conditioning expansion turbine exceeds 110 percent of its maximum operating speed, the flow control/shutoff valves and the air conditioning system (ACS) pressure regulator/shutoff valves close. This is done to prevent any damage or malfunctioning of the system due to excessive pressure.Rate this question:
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- 48.
(609) The water separator over temperature switch actuates at
- A.
175 ± 20 (°F).
- B.
175 ± 10°F.
- C.
155 ± 20°F.
- D.
155 ± 10°F.
Correct Answer
B. 175 ± 10°F.Explanation
The correct answer is 175 ± 10°F. This means that the water separator over temperature switch will actuate when the temperature reaches 175°F, with a tolerance of plus or minus 10 degrees. This allows for a range of temperatures between 165°F and 185°F for the switch to activate.Rate this question:
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- 49.
(610) The outlet bleed air temperature of the primary heat exchanger in a cargo air-conditioning system exceeds 540°F. When this happens, the high-limit section of the temperature anticipator sensor
- A.
Opens the cooling air valve.
- B.
Opens the ejector air valve.
- C.
Closes the primary heat exchanger shutoff valve.
- D.
Closes the bleed air pressure regulator and shutoff valve.
Correct Answer
D. Closes the bleed air pressure regulator and shutoff valve.Explanation
When the outlet bleed air temperature of the primary heat exchanger in a cargo air-conditioning system exceeds 540°F, the high-limit section of the temperature anticipator sensor closes the bleed air pressure regulator and shutoff valve. This is done in order to prevent further overheating and potential damage to the system. By closing the regulator and shutoff valve, the flow of bleed air is stopped, reducing the temperature and pressure in the system.Rate this question:
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- 50.
The cargo aircraft temperature control component that produces an electrical signal that causes the temperature control valve to increase or decrease compartment temperature as required to correct an unbalanced bridge condition is the temperature control
- A.
Box.
- B.
Sensor.
- C.
Limiter.
- D.
Rheostat.
Correct Answer
A. Box.Explanation
The cargo aircraft temperature control component that produces an electrical signal that causes the temperature control valve to increase or decrease compartment temperature as required to correct an unbalanced bridge condition is the temperature control box.Rate this question:
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Current Version
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Mar 18, 2023Quiz Edited by
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Jul 09, 2011Quiz Created by
Gdobby
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