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Turbine Engine Types
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Questions in this quiz (25)
1What are the main types of turbine engine?
- ATurboshaft, Turboprop, Turbojet and Turbofan
- BTurboprop and Turbofan
- CTurboprop, Turbojet and Turbofan
- DTurboshaft, Turboprop, Ramjet and Turbofan
2What is the definition of the bypass ratio of a turbofan engine?
- AThe ratio of the mass of air bypassing the engine core, to the mass of the air passing through the engine core.
- BThe ratio of the mass of air bypassing the engine core, to the mass of the air passing into the engine core.
- CThe ratio of the mass of air bypassing the engine case, to the mass of the air passing through the engine core.
- DThe ratio of the pressure of air bypassing the engine core, to the pressure of the air passing through the engine core.
3What is the main similarity between a turbine engine and a reciprocating engine?
- ABoth the turbine and reciprocating engine are internal combustion
- BBoth the turbine and reciprocating engine are external combustion
- CBoth the turbine and reciprocating engine are continuous cycle
- DBoth the turbine and reciprocating engine produce similar thrust
4How does the combustion cycle of a turbine engine compare with that of a reciprocating engine?
- AA turbine engine combustion takes place at a near constant pressure, while in a reciprocating engine combustion takes place at near constant volume.
- BA turbine engine combustion takes place at a near constant volume, while in a reciprocating engine combustion takes place at near constant pressure.
- CA turbine engine combustion takes place at a near constant pressure, while in a reciprocating engine combustion takes place at near constant temperature.
- DA turbine engine combustion takes place at a near constant pressure, while in a reciprocating engine combustion takes place at near constant pressure.
5What is the functional difference between a turboprop and a turbo shaft?
- AA 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
- BA 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
6How is a free power turbine characterised?
- AIt is mechanically completely independent of the other spools in the engine
- BIt is mechanically completely dependent of the other spools in the engine
- CIt is mechanically partially independent of the other spools in the engine
- DIt is mechanically partially dependent of the other spools in the engine
7What are the advantages of a free turbine propulsion system?
- AThe 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
- BEasier 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
- CThe design flexibility of the layout, easier to start and the ability to stop the propeller while the engine is still running
- DThe 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
8Why does a free turbine turboprop engine require a smaller starter motor than direct-drive and compound turboprops?
- ABecause only the high pressure turbine and compressor need to be rotated on start
- BBecause only the low pressure turbine and compressor need to be rotated on start
- CBecause only the low pressure turbine and ignitor need to be rotated on start
- DBecause only the high pressure turbine and ignitor need to be rotated on start
9Which part of a turboprop engine usually powers the accessory gearbox?
- AThe high pressure compressor (N2) section.
- BThe high pressure compressor (N1) section.
- CThe low pressure compressor (N1) section.
- DThe low pressure compressor (N2) section.
10What drives the main drive gearbox in a free turbine turboprop or turboshaft?
- AThe low pressure turbine(s)
- BThe high pressure turbine(s)
11What is the meaning of the term 'Spool'
- AAn independent compressor, shaft, turbine combination
- BAn dependent compressor, shaft, turbine combination
- CAn dependent compressor and turbine combination
- DAn independent compressor and turbine combination
12What is a compressor/turbine combination called?
- AA free turbine
- BA spool
- CA continuous cycle
- DA geared turbine
13Why do turbine engines have multiple spools?
- ASo that each can operate closer to their design rpm
- BSo that each can operate closer to their design egt
- CSo that each can operate closer to their design limits
- DSo that each can operate closer to their design features
14In a twin spool turbine engine, which are the high pressure and low pressure stages of the compressor and turbine?
- AThe 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
- BThe 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
15Within an engine's spools, what drives the intermediate pressure compressor?
- AThe intermediate pressure turbine
- BThe low pressure turbine
- CThe high pressure turbine
16Within an engine's spools, what drives the low pressure compressor?
- AThe low pressure turbine
- BThe high pressure turbine
- CThe intermediate pressure turbine
17What is the 'core' of a turbofan engine comprised of?
- AThe compressor, combustion chamber, turbine and exhaust sections
- BIntake, the compressor, the combustion chamber, turbine and the exhaust nozzle
- CThe compressor, combustion chamber, turbine and exhaust nozzle
18What is the bypass ratio if 20% of the intake air passes through the engine core?
- A4:1
- B2:1
- C3:1
- D5:1
19In terms of bypass ratio, how does a pure turbojet compare to a turbofan?
- AA pure turbojet has no bypass air
- BA pure turbofan has no bypass air
20What percentage of bypass air passes through the compressor of a turbofan engine?
- A0%
- B40%
- C80%
- D22%
21What are the advantages of a twin spool over a triple spool bypass engine?
- ALower cost, easier maintenance
- BShorter and lighter, better range/fuel consumption
- CShorter and lighter, lower cost, easier maintenance
- DLower cost, easier maintenance, better range/fuel consumption
22What are the advantages of a triple spool over a twin spool bypass engine?
- AShorter and lighter, better range/fuel consumption
- BLower cost, better range/fuel consumption
- CShorter and lighter, easier maintenance
- DLower cost, easier maintenance
23What output is provided by an APU?
- AAC electrical power and bleed air
- BDC electrical power
- CAC electrical power
- DDC electrical power and bleed air
24What is the primary purpose of an APU?
- ATo provide AC electrical power and pneumatic bleed on the ground, and in flight in the event of a main engine failure.
- BTo provide DC electrical power and pneumatic bleed on the ground, and in flight in the event of a main engine failure.
- CTo provide DC electrical power and pneumatic bleed on the ground, and in flight in the event of a main battery/generator failure.
- DTo provide AC electrical power and pneumatic bleed on the ground, and in flight in the event of a battery/generator failure.
25What section of an APU provides pneumatic bleed air for engine start?
- AThe driveshaft
- BThe turbine
- CThe compressor
- DThe spools
Information
- Description
- Turbine Engine Types
- Author
- Andrew Lee
- Language
- English
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