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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The criterion of the thermodynamic efficiency for rotary compressor is

Polytropic compression
Isothermal compression
Isentropic compression
None of the listed here

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Compressors, Gas Turbines and Jet Engines
For slow speed large capacity compressor, following type of valve will be best suited

Any of the above
Poppet valve
Mechanical valve of the Corliss, sleeve, rotary or semi rotary type
Disc or feather type

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Compressors, Gas Turbines and Jet Engines
A gas turbine used in air craft should have

High speed and high h.p.
Low weight and small frontal area
Small frontal area and high h.p.
High h.p. and low weight

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Compressors, Gas Turbines and Jet Engines
The degree of reaction is usually kept ________ for all types of axial flow compressors.

0.4
0.2
0.3
0.5

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency for reciprocating air compressors is about

60 to 70%
70 to 90%
10 to 40%
40 to 60%

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Compressors, Gas Turbines and Jet Engines
A rocket engine uses __________ for the combustion of its fuel.

Its own oxygen
None of these
Compressed atmospheric air
Surrounding air

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