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Turbine Engine Types

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Turbine Engine Types
Andrew Lee
Quiz by Andrew Lee, updated more than 1 year ago
Andrew Lee
Created by Andrew Lee over 8 years ago
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Resource summary

Question 1

Question
What are the main types of turbine engine?
Answer
  • Turboshaft, Turboprop, Turbojet and Turbofan
  • Turboprop and Turbofan
  • Turboprop, Turbojet and Turbofan
  • Turboshaft, Turboprop, Ramjet and Turbofan

Question 2

Question
What is the definition of the bypass ratio of a turbofan engine?
Answer
  • 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.

Question 3

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

Question 4

Question
How does the combustion cycle of a turbine engine compare with that of a reciprocating engine?
Answer
  • 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.

Question 5

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

Question 6

Question
How is a free power turbine characterised?
Answer
  • 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

Question 7

Question
What are the advantages of a free turbine propulsion system?
Answer
  • 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

Question 8

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

Question 9

Question
Which part of a turboprop engine usually powers the accessory gearbox?
Answer
  • The high pressure compressor (N2) section.
  • The high pressure compressor (N1) section.
  • The low pressure compressor (N1) section.
  • The low pressure compressor (N2) section.

Question 10

Question
What drives the main drive gearbox in a free turbine turboprop or turboshaft?
Answer
  • The low pressure turbine(s)
  • The high pressure turbine(s)

Question 11

Question
What is the meaning of the term 'Spool'
Answer
  • An independent compressor, shaft, turbine combination
  • An dependent compressor, shaft, turbine combination
  • An dependent compressor and turbine combination
  • An independent compressor and turbine combination

Question 12

Question
What is a compressor/turbine combination called?
Answer
  • A free turbine
  • A spool
  • A continuous cycle
  • A geared turbine

Question 13

Question
Why do turbine engines have multiple spools?
Answer
  • 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

Question 14

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

Question 15

Question
Within an engine's spools, what drives the intermediate pressure compressor?
Answer
  • The intermediate pressure turbine
  • The low pressure turbine
  • The high pressure turbine

Question 16

Question
Within an engine's spools, what drives the low pressure compressor?
Answer
  • The low pressure turbine
  • The high pressure turbine
  • The intermediate pressure turbine

Question 17

Question
What is the 'core' of a turbofan engine comprised of?
Answer
  • 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

Question 18

Question
What is the bypass ratio if 20% of the intake air passes through the engine core?
Answer
  • 4:1
  • 2:1
  • 3:1
  • 5:1

Question 19

Question
In terms of bypass ratio, how does a pure turbojet compare to a turbofan?
Answer
  • A pure turbojet has no bypass air
  • A pure turbofan has no bypass air

Question 20

Question
What percentage of bypass air passes through the compressor of a turbofan engine?
Answer
  • 0%
  • 40%
  • 80%
  • 22%

Question 21

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

Question 22

Question
What are the advantages of a triple spool over a twin spool bypass engine?
Answer
  • Shorter and lighter, better range/fuel consumption
  • Lower cost, better range/fuel consumption
  • Shorter and lighter, easier maintenance
  • Lower cost, easier maintenance

Question 23

Question
What output is provided by an APU?
Answer
  • AC electrical power and bleed air
  • DC electrical power
  • AC electrical power
  • DC electrical power and bleed air

Question 24

Question
What is the primary purpose of an APU?
Answer
  • 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.

Question 25

Question
What section of an APU provides pneumatic bleed air for engine start?
Answer
  • The driveshaft
  • The turbine
  • The compressor
  • The spools
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