Question 1

What is the purpose of the compressor stage in an aircraft gas turbine engine?

Accepted Answer

To compress the incoming air before it enters the combustion chamber.

Answer

To produce electrical power.

Answer

To cool the exhaust gases.

Answer

To ignite the fuel-air mixture.

Question 2

What is the main component of the compressor stage in an aircraft gas turbine engine?

Accepted Answer

A series of rotating blades.

Answer

A heat exchanger.

Answer

A hydraulic pump.

Answer

A fuel injector.

Question 3

What is the function of the stator vanes in the compressor stage of an aircraft gas turbine engine?

Accepted Answer

To guide and direct the airflow into the rotor blades.

Answer

To compress the incoming air.

Answer

To slow down the rotation of the compressor.

Answer

To cool the compressor section.

Question 4

What is surge in an aircraft gas turbine engine compressor stage?

Accepted Answer

When the compressor experiences a sudden reversal of airflow due to stall.

Answer

When the compressor produces too much exhaust.

Answer

When the compressor experiences a fuel leak.

Answer

When the compressor blades spin faster than normal.

Question 5

What is the purpose of bleed air in an aircraft gas turbine engine compressor stage?

Accepted Answer

To provide air for engine starting, cabin pressurization, and other aircraft systems.

Answer

To cool the compressor blades.

Answer

To improve the efficiency of the compressor.

Answer

To produce additional thrust.

Question 6

What is the relationship between the pressure ratio and efficiency of an aircraft gas turbine engine compressor stage?

Accepted Answer

Higher pressure ratios generally lead to higher efficiencies.

Answer

Efficiency is the only factor affecting pressure ratio.

Answer

Higher pressure ratios generally lead to lower efficiencies.

Answer

Pressure ratio and efficiency are unrelated.

Question 7

What is a characteristic of a two-spool compressor in an aircraft gas turbine engine?

Accepted Answer

It has two rotating compressor sections, each with its own turbine.

Answer

It has a three-stage compressor section.

Answer

It has a single compressor and turbine.

Answer

It is only used on military aircraft.

Question 8

What is a characteristic of an axial compressor in an aircraft gas turbine engine?

Accepted Answer

It uses a series of rotating and stationary airfoils to compress air.

Answer

It is only used on small aircraft.

Answer

It compresses air using centrifugal force.

Answer

It has a low compression ratio.

Question 9

What is a characteristic of a centrifugal compressor in an aircraft gas turbine engine?

Accepted Answer

It uses a high-speed impeller to compress air.

Answer

It has a low compression ratio.

Answer

It is only used on military aircraft.

Answer

It uses a series of rotating and stationary airfoils to compress air.

Question 10

What is a characteristic of a variable stator compressor in an aircraft gas turbine engine?

Accepted Answer

It can adjust the angle of the stator blades to optimize compressor performance.

Answer

It has a fixed angle for the stator blades.

Answer

It is only used on helicopters.

Answer

It has a lower pressure ratio than a variable compressor.

Question 11

What is the function of the combustion stage in an aircraft gas turbine engine?

Accepted Answer

To burn fuel and create high temperature gases

Answer

To compress the incoming air

Answer

To generate electrical power

Answer

To cool down the exhaust gases

Question 12

What is the main purpose of the turbine stage in an aircraft gas turbine engine?

Accepted Answer

Extract energy from the hot gases to drive the compressor and produce thrust

Answer

Provide cooling for the combustion chamber

Answer

Store excess fuel for future use

Answer

Mix fuel with air before combustion

Question 13

What happens to air as it passes through the turbine stage of an aircraft gas turbine engine?

Accepted Answer

It loses pressure and gains speed

Answer

It gains pressure and loses speed

Answer

It remains at a constant pressure and speed

Answer

It becomes colder and more dense

Question 14

What material is typically used to make the turbine blades in an aircraft gas turbine engine?

Accepted Answer

Nickel-based superalloys

Answer

Copper

Answer

Aluminum

Answer

Steel

Question 15

In what part of an aircraft gas turbine engine is the turbine stage usually located?

Accepted Answer

Between the combustion chamber and the exhaust nozzle

Answer

In front of the compressor

Answer

Next to the fuel tank

Answer

Behind the exhaust nozzle

Question 16

How does the turbine stage contribute to the production of thrust in an aircraft gas turbine engine?

Accepted Answer

By driving the compressor which compresses air and mixes it with fuel for combustion

Answer

By directing exhaust gases backwards through the engine

Answer

By creating a vacuum in front of the engine

Answer

By providing a source of cooling for the engine

Question 17

What happens to the temperature of the air as it passes through the turbine stage of an aircraft gas turbine engine?

Accepted Answer

It gets hotter due to adiabatic heating

Answer

It fluctuates rapidly

Answer

It remains at a constant temperature

Answer

It gets colder due to adiabatic cooling

Question 18

What is the purpose of the stator vanes in the turbine stage of an aircraft gas turbine engine?

Accepted Answer

To convert some of the kinetic energy of the exhaust gases into pressure energy

Answer

To mix fuel with the air before combustion

Answer

To extract energy from the exhaust gases to drive the compressor

Answer

To direct the exhaust gases out of the engine

Question 19

What is the maximum temperature that turbine blades in an aircraft gas turbine engine can withstand?

Accepted Answer

Around 2000°C

Answer

Around 1000°C

Answer

Around 1500°C

Answer

Around 2500°C

Question 20

What is the purpose of the nozzle in an aircraft gas turbine engine?

Accepted Answer

To increase the velocity of the exhaust gases and produce thrust

Answer

To compress incoming air before combustion

Answer

To extract energy from the exhaust gases to power the compressor

Answer

To mix fuel with air before combustion

Question 21

How does the turbine stage of an aircraft gas turbine engine contribute to fuel efficiency?

Accepted Answer

By driving the compressor which compresses air and reduces the amount of fuel needed for combustion

Answer

By providing a source of cooling for the engine

Answer

By extracting energy from the exhaust gases and using it to power the engine

Answer

By minimizing the resistance to air flow through the engine

Question 22

What is the purpose of the aircraft gas turbine engine exhaust nozzle stage?

Accepted Answer

To increase thrust by accelerating exhaust gases

Answer

To cool down exhaust gases

Answer

To decrease thrust by slowing down exhaust gases

Answer

To filter out pollutants from exhaust gases

Question 23

What is meant by the term 'bypass ratio' in the context of a turbofan engine?

Accepted Answer

The ratio of air that bypasses the engine core to the air that passes through the core and is combusted

Answer

The ratio of fan blade length to engine diameter

Answer

The ratio of fuel consumed to thrust produced by the engine

Answer

The ratio of turbine stages to compressor stages in the engine

Question 24

What is a characteristic feature of a supersonic exhaust nozzle?

Accepted Answer

It is convergent-divergent in shape

Answer

It is made of aluminum alloy

Answer

It has a rectangular cross-section

Answer

It is straight and cylindrical in shape

Question 25

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

Accepted Answer

To add extra heat energy to the exhaust gases by burning additional fuel, increasing thrust

Answer

To mix fuel and air to prepare the gases for combustion

Answer

To extract energy from the hot gases to power the turbine

Answer

To cool down the exhaust gases before they exit the engine

Question 26

What is the purpose of the flame holder in a gas turbine engine?

Accepted Answer

To stabilize the flame in the combustion chamber

Answer

To increase the pressure and temperature of the incoming air

Answer

To cool down the exhaust gases before they exit the engine

Answer

To mix fuel and air in the combustion chamber

Question 27

Which type of engine is typically more fuel efficient: a turboprop or a turbojet?

Accepted Answer

Turboprop

Answer

Both have the same fuel efficiency

Answer

Fuel efficiency depends on factors other than engine type

Answer

Turbojet

Question 28

What is the function of the stator vanes in a gas turbine engine?

Accepted Answer

To guide and direct the flow of air into the turbine

Answer

To mix fuel and air in the combustion chamber

Answer

To cool down the exhaust gases

Answer

To compress incoming air to increase air pressure and temperature

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