Andrew Lee
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Turbine Engine Types

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Andrew Lee
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Turbine Engine Types

Turbine Engine Types

Question 1 of 25

1

What are the main types of turbine engine?

Select one or more of the following:

  • Turboshaft, Turboprop, Turbojet and Turbofan

  • Turboprop and Turbofan

  • Turboprop, Turbojet and Turbofan

  • Turboshaft, Turboprop, Ramjet and Turbofan

Explanation

Question 2 of 25

1

What is the definition of the bypass ratio of a turbofan engine?

Select one or more of the following:

  • The ratio of the mass of air bypassing the engine core, to the mass of the air passing through the engine core.

  • The ratio of the mass of air bypassing the engine core, to the mass of the air passing into the engine core.

  • The ratio of the mass of air bypassing the engine case, to the mass of the air passing through the engine core.

  • The ratio of the pressure of air bypassing the engine core, to the pressure of the air passing through the engine core.

Explanation

Question 3 of 25

1

What is the main similarity between a turbine engine and a reciprocating engine?

Select one or more of the following:

  • Both the turbine and reciprocating engine are internal combustion

  • Both the turbine and reciprocating engine are external combustion

  • Both the turbine and reciprocating engine are continuous cycle

  • Both the turbine and reciprocating engine produce similar thrust

Explanation

Question 4 of 25

1

How does the combustion cycle of a turbine engine compare with that of a reciprocating engine?

Select one or more of the following:

  • A turbine engine combustion takes place at a near constant pressure, while in a reciprocating engine combustion takes place at near constant volume.

  • A turbine engine combustion takes place at a near constant volume, while in a reciprocating engine combustion takes place at near constant pressure.

  • A turbine engine combustion takes place at a near constant pressure, while in a reciprocating engine combustion takes place at near constant temperature.

  • A turbine engine combustion takes place at a near constant pressure, while in a reciprocating engine combustion takes place at near constant pressure.

Explanation

Question 5 of 25

1

What is the functional difference between a turboprop and a turbo shaft?

Select one or more of the following:

  • A turboprop engine has an output shaft which drives a gearbox for a propeller while a turboshaft engine has an output shaft which drives a gearbox for something other than a propeller

  • A turboshaft engine has an output shaft which drives a gearbox for a propeller while a turbprop engine has an output shaft which drives a gearbox for something other than a propeller

Explanation

Question 6 of 25

1

How is a free power turbine characterised?

Select one or more of the following:

  • It is mechanically completely independent of the other spools in the engine

  • It is mechanically completely dependent of the other spools in the engine

  • It is mechanically partially independent of the other spools in the engine

  • It is mechanically partially dependent of the other spools in the engine

Explanation

Question 7 of 25

1

What are the advantages of a free turbine propulsion system?

Select one or more of the following:

  • The design flexibility of the layout, easier to start, the spools can run at their optimum speeds independent of each other and the ability to stop the propeller while the engine is still running

  • Easier to start, the spools can run at their optimum speeds independent of each other and the ability to stop the propeller while the engine is still running

  • The design flexibility of the layout, easier to start and the ability to stop the propeller while the engine is still running

  • The design flexibility of the layout, the spools can run at their optimum speeds independent of each other and the ability to stop the propeller while the engine is still running

Explanation

Question 8 of 25

1

Why does a free turbine turboprop engine require a smaller starter motor than direct-drive and compound turboprops?

Select one or more of the following:

  • Because only the high pressure turbine and compressor need to be rotated on start

  • Because only the low pressure turbine and compressor need to be rotated on start

  • Because only the low pressure turbine and ignitor need to be rotated on start

  • Because only the high pressure turbine and ignitor need to be rotated on start

Explanation

Question 9 of 25

1

Which part of a turboprop engine usually powers the accessory gearbox?

Select one or more of the following:

  • The high pressure compressor (N2) section.

  • The high pressure compressor (N1) section.

  • The low pressure compressor (N1) section.

  • The low pressure compressor (N2) section.

Explanation

Question 10 of 25

1

What drives the main drive gearbox in a free turbine turboprop or turboshaft?

Select one or more of the following:

  • The low pressure turbine(s)

  • The high pressure turbine(s)

Explanation

Question 11 of 25

1

What is the meaning of the term 'Spool'

Select one or more of the following:

  • An independent compressor, shaft, turbine combination

  • An dependent compressor, shaft, turbine combination

  • An dependent compressor and turbine combination

  • An independent compressor and turbine combination

Explanation

Question 12 of 25

1

What is a compressor/turbine combination called?

Select one or more of the following:

  • A free turbine

  • A spool

  • A continuous cycle

  • A geared turbine

Explanation

Question 13 of 25

1

Why do turbine engines have multiple spools?

Select one or more of the following:

  • So that each can operate closer to their design rpm

  • So that each can operate closer to their design egt

  • So that each can operate closer to their design limits

  • So that each can operate closer to their design features

Explanation

Question 14 of 25

1

In a twin spool turbine engine, which are the high pressure and low pressure stages of the compressor and turbine?

Select one or more of the following:

  • The first stage(s) of the compressor and the last stage(s) of the turbine are low pressure, while the last stage(s) of the compressor and the first stages of the turbine are high pressure

  • The first stage(s) of the compressor and the last stage(s) of the turbine are high pressure, while the last stage(s) of the compressor and the first stages of the turbine are low pressure

Explanation

Question 15 of 25

1

Within an engine's spools, what drives the intermediate pressure compressor?

Select one or more of the following:

  • The intermediate pressure turbine

  • The low pressure turbine

  • The high pressure turbine

Explanation

Question 16 of 25

1

Within an engine's spools, what drives the low pressure compressor?

Select one or more of the following:

  • The low pressure turbine

  • The high pressure turbine

  • The intermediate pressure turbine

Explanation

Question 17 of 25

1

What is the 'core' of a turbofan engine comprised of?

Select one or more of the following:

  • The compressor, combustion chamber, turbine and exhaust sections

  • Intake, the compressor, the combustion chamber, turbine and the exhaust nozzle

  • The compressor, combustion chamber, turbine and exhaust nozzle

Explanation

Question 18 of 25

1

What is the bypass ratio if 20% of the intake air passes through the engine core?

Select one or more of the following:

  • 4:1

  • 2:1

  • 3:1

  • 5:1

Explanation

Question 19 of 25

1

In terms of bypass ratio, how does a pure turbojet compare to a turbofan?

Select one or more of the following:

  • A pure turbojet has no bypass air

  • A pure turbofan has no bypass air

Explanation

Question 20 of 25

1

What percentage of bypass air passes through the compressor of a turbofan engine?

Select one or more of the following:

  • 0%

  • 40%

  • 80%

  • 22%

Explanation

Question 21 of 25

1

What are the advantages of a twin spool over a triple spool bypass engine?

Select one or more of the following:

  • Lower cost, easier maintenance

  • Shorter and lighter, better range/fuel consumption

  • Shorter and lighter, lower cost, easier maintenance

  • Lower cost, easier maintenance, better range/fuel consumption

Explanation

Question 22 of 25

1

What are the advantages of a triple spool over a twin spool bypass engine?

Select one or more of the following:

  • Shorter and lighter, better range/fuel consumption

  • Lower cost, better range/fuel consumption

  • Shorter and lighter, easier maintenance

  • Lower cost, easier maintenance

Explanation

Question 23 of 25

1

What output is provided by an APU?

Select one or more of the following:

  • AC electrical power and bleed air

  • DC electrical power

  • AC electrical power

  • DC electrical power and bleed air

Explanation

Question 24 of 25

1

What is the primary purpose of an APU?

Select one or more of the following:

  • To provide AC electrical power and pneumatic bleed on the ground, and in flight in the event of a main engine failure.

  • To provide DC electrical power and pneumatic bleed on the ground, and in flight in the event of a main engine failure.

  • To provide DC electrical power and pneumatic bleed on the ground, and in flight in the event of a main battery/generator failure.

  • To provide AC electrical power and pneumatic bleed on the ground, and in flight in the event of a battery/generator failure.

Explanation

Question 25 of 25

1

What section of an APU provides pneumatic bleed air for engine start?

Select one or more of the following:

  • The driveshaft

  • The turbine

  • The compressor

  • The spools

Explanation

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