1.
With engines and APU running and APU bleed valve selected ON, select the correct
statement:
Correct Answer
B. Engine bleed valves close, X bleed valve opens, APU bleed valve opens.
Explanation
When the engines and APU are running and the APU bleed valve is selected ON, the correct statement is that the engine bleed valves close, the X bleed valve opens, and the APU bleed valve opens.
2.
To provide external air for ENG start the following switching is required:
Correct Answer
B. Pneumatic X-bleed OPEN.
Explanation
To provide external air for ENG start, the pneumatic X-bleed needs to be opened. This allows the air from the external source to flow into the engine for starting. The other switches mentioned, such as pneumatic X-bleed AUTO, engine bleed switches off, and APU bleed switch off, are not directly related to providing external air for engine start.
3.
Air bleed from the engines is:
Correct Answer
B. Cooled in a heat exchanger by cooling air bleed from fan section.
Explanation
Air bleed from the engines is cooled in a heat exchanger by cooling air bleed from the fan section. This means that the hot air that is bled from the engines is cooled down by passing it through a heat exchanger where it comes into contact with cooler air bleed from the fan section. The purpose of this cooling process is to ensure that the air used by the systems is at an appropriate temperature for their operation.
4.
High pressure air is supplied from:
Correct Answer
A. Engine 1 and 2 bleed systems, APU load compressor and HP ground connection.
Explanation
High pressure air is supplied from engine 1 and 2 bleed systems, APU load compressor, and HP ground connection. This means that the high pressure air is sourced from the bleed systems of both engines, as well as from the APU load compressor and the HP ground connection.
5.
Pneumatic system operation is controlled and monitored by:
Correct Answer
C. Two bleed monitoring computers.
Explanation
The correct answer is "Two bleed monitoring computers." In a pneumatic system, the operation is controlled and monitored by bleed monitoring computers. These computers are responsible for monitoring the pressure and flow of the air in the system, ensuring that it is within the desired parameters. Having two bleed monitoring computers allows for redundancy and increased reliability in the system, as one computer can take over if the other fails.
6.
Which source operates the bleed valve?
Correct Answer
A. Pneumatic
Explanation
The correct answer is "Pneumatic" because a bleed valve is typically operated by air pressure or pneumatic power. This means that it is controlled by the flow of compressed air or gas, rather than by an electric current. Therefore, the correct source for operating a bleed valve is pneumatic.
7.
What happens when pressure and temperature are not sufficient to supply the
corresponding engine bleed valve:
Correct Answer
C. HP valve opened, IP stage remains in the same configuration.
Explanation
When pressure and temperature are not sufficient to supply the corresponding engine bleed valve, the HP valve is opened and the IP stage remains in the same configuration. This means that the high-pressure valve is allowing the flow of air, while the intermediate-pressure stage remains unaffected and does not change its configuration.
8.
Can you control the HP valve position through the air bleed cockpit panel?
Correct Answer
B. No
Explanation
Explanation: The given answer "No" indicates that it is not possible to control the HP valve position through the air bleed cockpit panel. This suggests that the air bleed cockpit panel does not have the capability to directly manipulate or adjust the HP valve position.
9.
If the bleed valve closes, the HP valve:
Correct Answer
A. Closes automatically.
Explanation
When the bleed valve closes, it means that the flow of high-pressure air from the engine to the aircraft's systems is stopped. In this scenario, the HP valve, which controls the flow of high-pressure air, will also close automatically to maintain system integrity and prevent any loss of pressure. Therefore, the correct answer is that the HP valve closes automatically when the bleed valve closes.
10.
Temperature regulation is achieved by the precooler which regulates and limits the
temperature at:
Correct Answer
C. 200ºC
Explanation
The correct answer is 200°C because the question states that temperature regulation is achieved by the precooler. This implies that the precooler is responsible for controlling and limiting the temperature. Therefore, the temperature at which the precooler regulates and limits the temperature is 200°C.
11.
Which source controls the cross bleed valve:
Correct Answer
B. Electric
Explanation
The correct answer is Electric. Electric sources control the cross bleed valve. This means that the valve is operated and regulated by an electrical system or mechanism. It is not controlled by pneumatic, hydraulic, or mechanical linkages.
12.
Cross-bleed valve is provided with 2 electrical motors:
Correct Answer
A. One for the automatic mode, the other one for the manual mode.
Explanation
The cross-bleed valve is equipped with two electrical motors, one for the automatic mode and the other one for the manual mode. This means that there are separate motors for each mode of operation, allowing for both automatic and manual control of the valve.
13.
In case of low upstream pressure, the high pressure valve (HP valve) is:
Correct Answer
A. Pneumatically closed
Explanation
When there is low upstream pressure, the high pressure valve (HP valve) is pneumatically closed. This means that the valve is closed using pneumatic pressure, which is air pressure. The low upstream pressure causes the valve to close automatically using the pneumatic mechanism.
14.
Which statement accurately describes the role of the aircraft pneumatic system?
Correct Answer
C. Supplies pressurized air for engine starting, air conditioning, and cabin pressurization.
Explanation
The aircraft pneumatic system is responsible for supplying pressurized air for various functions such as engine starting, air conditioning, and cabin pressurization. This system plays a crucial role in providing the necessary air pressure to start the engines, maintaining a comfortable temperature inside the aircraft through air conditioning, and ensuring the cabin is pressurized at high altitudes for passenger safety and comfort. It does not provide electrical power, regulate fuel flow, or control hydraulic system pressure.
15.
What is the purpose of the bleed air management system in an aircraft?
Correct Answer
D. To control the flow and distribution of bleed air for various aircraft functions.
Explanation
The purpose of the bleed air management system in an aircraft is to control the flow and distribution of bleed air for various aircraft functions. Bleed air is compressed air taken from the engine's compressor section and is used for a variety of purposes such as pressurizing the cabin, operating air conditioning systems, providing air for engine starting, and anti-icing the aircraft. The bleed air management system ensures that the correct amount of bleed air is delivered to each system and component, allowing for efficient and safe operation of the aircraft.