# Aircraft Bleed Air Systems! Trivia Questions Quiz

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Are you familiar with the phrase, aircraft bleed systems? The uncontrolled loss of blood air from the pneumatic system or any of the pneumatically powered services have the potential to inflict damage to aircraft structures. Bleed air is comprised of air taken from the compressor stage of a gas turbine upstream of its fuel-burning sections. Try this quiz and test your knowledge about aircraft bleed air systems.

• 1.

### What is the atmospheric pressure at sea level?

• A.

14.69 psi

• B.

12.32 psi

• C.

13.45 psi

• D.

17.36 psi

A. 14.69 psi
Explanation
The atmospheric pressure at sea level is 14.69 psi. Atmospheric pressure is the force per unit area exerted on a surface by the weight of the air above it. At sea level, the weight of the air column above is greatest, resulting in higher atmospheric pressure compared to higher altitudes.

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• 2.

### What is the purpose of the bleed ait system?

• A.

To operate or control hydraulic systems or components.

• B.

To operate or control pneumatic systems or components.

• C.

To operate or control electrical systems or components.

• D.

To operate or control engine systems or components.

B. To operate or control pneumatic systems or components.
Explanation
The purpose of the bleed air system is to operate or control pneumatic systems or components. Pneumatic systems use compressed air to power various systems and components, such as brakes, landing gear, and cabin pressurization. The bleed air system draws compressed air from the aircraft's engines and supplies it to the pneumatic systems, allowing them to function properly.

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• 3.

### What is the temperature and pressure of bleed air?

• A.

150 psi and 300-600 degrees Fahrenheit.

• B.

150 psi and 600-900 degrees Fahrenheit.

• C.

200 psi and 300-600 degrees Fahrenheit.

• D.

200 psi and 600-900 degrees Fahrenheit.

D. 200 psi and 600-900 degrees Fahrenheit.
Explanation
Bleed air is typically used in aircraft systems for various purposes such as cabin pressurization and air conditioning. The correct answer states that the temperature and pressure of bleed air are 200 psi and 600-900 degrees Fahrenheit. This indicates that the air is pressurized at 200 psi and can reach temperatures ranging from 600 to 900 degrees Fahrenheit. This high temperature range is necessary to ensure efficient operation of the aircraft systems that rely on bleed air.

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• 4.

### What function does a pressure limiter serve in a bleed air system?

• A.

To protect upstream components from excessive pressure.

• B.

To protect downstream components from excessive pressure.

• C.

To protect upstream components from inadequate pressure.

• D.

To protect downstream components from inadequate pressure.

B. To protect downstream components from excessive pressure.
Explanation
A pressure limiter in a bleed air system serves to protect downstream components from excessive pressure. This means that it prevents the pressure from exceeding a certain limit, ensuring that the components downstream of the limiter are not damaged or compromised due to excessive pressure.

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• 5.

### What are the two functions of the airflow regulator?

• A.

Inlet pressure and and temperature regulation.

• B.

Air temperature regulation and sensing.

• C.

Flow control and pressure limiting.

• D.

Pressure sensing and flow limiting.

C. Flow control and pressure limiting.
Explanation
The correct answer is "Flow control and pressure limiting." The airflow regulator has two main functions: controlling the flow of air and limiting the pressure. It is responsible for regulating the amount of air that enters a system and maintaining a specific pressure level within that system. By controlling the flow and limiting the pressure, the airflow regulator ensures that the system operates efficiently and safely.

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• 6.

### What materials are used for high-pressure/high-temperature ducting?

• A.

Titanium.

• B.

Plastic.

• C.

Aluminum.

• D.

Stainless steel.

D. Stainless steel.
Explanation
Stainless steel is used for high-pressure/high-temperature ducting because it has excellent resistance to corrosion, high strength, and can withstand extreme temperatures. It is a durable and reliable material that can handle the demanding conditions of high-pressure and high-temperature environments without deforming or deteriorating. Titanium may also be used in some cases, but stainless steel is more commonly used due to its lower cost and widespread availability. Plastic and aluminum are not suitable for high-pressure/high-temperature ducting as they do not possess the necessary strength and resistance to withstand such conditions.

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• 7.

### What type of lubricant can be used on beaded duct sleeves to aid in the installation?

• A.

Oil.

• B.

Water.

• C.

Grease.

• D.

None.

B. Water.
Explanation
Water can be used as a lubricant on beaded duct sleeves to aid in the installation. Water acts as a temporary lubricant that helps reduce friction and makes it easier to slide the sleeves into place. It is a commonly used lubricant in this context because it is easily accessible and does not leave behind any residue or cause damage to the sleeves or surrounding materials.

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• 8.

### Which F-22 bleed air system components prevent bleed air from back flowing into the left and right engines?

• A.

Left and right secondary bleed air check valves.

• B.

Forward and aft secondary bleed air check valves.

• C.

Left and right primary bleed air check valves.

• D.

Forward and aft primary bleed air check valves.

C. Left and right primary bleed air check valves.
Explanation
The left and right primary bleed air check valves prevent bleed air from back flowing into the left and right engines. These valves ensure that the flow of bleed air is unidirectional, allowing it to only move in the desired direction and preventing any reverse flow. This helps maintain the proper functioning of the bleed air system and ensures that the engines receive the necessary air supply for operation.

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• 9.

### What is the sensitive pressure range of the F-22 bleed air system's primary HE injector inlet pressure sensor?

• A.

0-150 psi

• B.

0-275 psi

• C.

0-350 psi

• D.

0-550 psi

A. 0-150 psi
Explanation
The sensitive pressure range of the F-22 bleed air system's primary HE injector inlet pressure sensor is 0-150 psi. This means that the sensor is designed to accurately measure pressures within this range. Pressures outside of this range may not be accurately measured by the sensor.

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