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😵‍💫 > POWERPLANT - GAS TURBINE ENGINE > Flashcards

POWERPLANT - GAS TURBINE ENGINE Flashcards

1
Q

What is the primary difference between the Brayton cycle and the Otto cycle in terms of process?

A

Brayton cycle is a constant pressure process

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2
Q

Which component is essential for the Brayton cycle in jet engines but not present in reciprocating engines?

A

Compressor

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3
Q

In the Brayton cycle, what happens during the compression phase?

A

Air is compressed, raising its pressure and temperature

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4
Q

During which part of the Brayton cycle is energy extracted to perform work?

A

Expansion

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5
Q

In a typical jet engine operating on the Brayton cycle, where does the combustion process occur?

A

In the combustion chamber

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6
Q

How does the Brayton cycle improve the efficiency of jet engines compared to piston engines using the Otto cycle?

A

By continuously compressing and expanding air

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7
Q

Whch of the following best describes the sequence of processes in a Brayton cycle?

A

Intake, Compression, Combustion, Expansion, Exhaust

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8
Q

Which component in a turbojet engine compresses the air?

A

Compressor

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9
Q

What is the purpose of an air intake in a jet engine?

A

Supply air to the compressor

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10
Q

What is the function of the compressor in a jet engine?

A

Increase the pressure of the incoming air

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11
Q

How is fuel typically ignited in a jet engine?

A

Combustion chamber igniters

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12
Q

What is the purpose of the combustor in a jet engine?

A

To burn the fuel-air mixture

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13
Q

What is the purpose of the turbine in a jet engine?

A

. Increase air pressure

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14
Q

What is the primary function of the turbine in a jet engine?

A

To extract energy from the combustion gases

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15
Q

In a turbine engine, what is the function of the compressor section?

A

To increase the pressure of the air before combustion

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16
Q

Which component in a jet engine extracts energy from the high-speed exhaust gases?

A

Turbine

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17
Q

What is the primary purpose of the afterburner in some jet engines?

A

To increase thrust by burning additional fuel in the exhaust stream

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18
Q

How is the speed of a turbojet engine primarily controlled?

A

Adjusting the fuel flow

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19
Q

Which type of ignition system is commonly used in jet engines?

A

Electric spark ignition

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20
Q

What is the primary purpose of the reduction gear in a turboprop engine?

A

Decrease propeller RPM

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21
Q

How is the thrust generated in a turbofan engine?

A

By the bypassed air and exhaust gases

22
Q

What is the function of the accessory gearbox in a jet engine?

A

Power auxiliary components

23
Q

Which type of lubrication system is commonly used in jet engines?

A

Pressure lubrication

24
Q

What is the purpose of the diffuser in a jet engine?

A

Decrease air velocity and increase pressure

25
Q

What is the main function of the turbine blades in a jet engine?

A

Extract energy from the exhaust gases

26
Q

Which type of cooling system is typically used in jet engines?

A

Air cooling

27
Q

How is the speed of a turboprop engine controlled?

A

Changing the propeller pitch

28
Q

Which type of turbine is used to drive the fan in a high-bypass turbofan engine?

A

Low-pressure turbine

29
Q

Which type of turbine blade is used in the high-temperature section of a jet engine?

A

Ceramic-coated blades

30
Q

What does the term ‘compressor pressure ratio’ refer to in a jet engine?

A

c. Ratio of compressor outlet pressure to inlet pressure

31
Q

What is the purpose of a bypass duct in a turbofan engine?

A

Allow air to bypass the engine core

32
Q

What is ‘hot section’ maintenance in a jet engine?

A

Maintenance of the combustor, turbine, and exhaust sections

33
Q

What is the purpose of a turbine blade shroud in a jet engine?

A

To reduce vibration and blade tip leakage

34
Q

What is the primary function of a fuel control unit in a jet engine?

A

To manage the fuel flow to maintain the desired engine speed and power output

35
Q

What is a ‘choked’ nozzle in a jet engine?

A

A nozzle that limits the maximum airflow

36
Q

What is the purpose of an igniter in a jet engine?

A

To ignite the fuel-air mixture during start-up

37
Q

What is the primary advantage of using a turbofan engine over a turbojet engine?

A

Higher fuel efficiency

38
Q

What is the function of an aftercooler in a reciprocating engine?

A

To cool the compressed air before it enters the combustion chamber

39
Q

What is the purpose of a ‘variable stator vane’ in a jet engine compressor?

A

To adjust the airflow through the compressor for optimal performance

40
Q

What type of bearing is commonly used in the turbine section of a jet engine?

A

Ball bearing

41
Q

What is the purpose of a ‘bleed valve’ in a jet engine?

A

To control airflow through the compressor

42
Q

What is the function of a ‘surge tank’ in an aircraft fuel system?

A

To collect overflow fuel

43
Q

What is the purpose of a ‘turbine nozzle’ in a jet engine?

A

To direct the flow of hot gases onto the turbine blades

44
Q

What is the purpose of a ‘thrust reverser’ in a jet engine?

A

To reverse the direction of thrust to help slow the aircraft during landing

45
Q

What is a ‘hot start’ in a jet engine?

A

A start in which the engine’s EGT exceeds safe limits

46
Q

The main purpose of engine oil in a turbine engine is to:

A

Lubricate and cool bearings

47
Q

What is the function of a fuel flow transmitter in a turbine engine?

A

To measure the rate of fuel consumption

48
Q

The term “hot section inspection” in turbine engine maintenance refers to inspecting:

A

The combustion chamber and turbine section

49
Q

What is the purpose of a fire detection system in a turbine engine?

A

To detect and alert of any fire in the engine compartment

50
Q

Which type of fuel filter are used in turbine engines?

A

Metal mesh filter

51
Q

What does ‘N2’ indicate in a dual-spool jet engine?

A

The speed of the high-pressure compressor

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