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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
In air breathing jet engine, the jet is formed by expanding

Plasma
Highly heated atmospheric air
Liquid
Solids

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Compressors, Gas Turbines and Jet Engines
The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

r ɣ-1
1 - (1/r) ɣ-1/ɣ
1 - r ɣ-1
1 - (1/r) ɣ/ɣ-1

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Compressors, Gas Turbines and Jet Engines
The performance of air compressor at high altitudes will be ________ as compared to that at sea level.

Lower
Same
None of these
Higher

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Compressors, Gas Turbines and Jet Engines
The work-done on a compressor will be minimum if air is taken from

A source of low temperature air
A source of high temperature air
A source at 0° C
The atmosphere

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Compressors, Gas Turbines and Jet Engines
The compressor efficiency is the

Total output/air input
Isothermal H.P./shaft H.R
Isothermal H.P/indicated H.R
Compression work/motor input

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Compressors, Gas Turbines and Jet Engines
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

0.9
0.99
0.75
0.85

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