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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

W₁/(W₁ + W₂)
(W₁ + W₂)/W₂
W₂/(W₁ + W₂)
(W₁ + W₂)/W₁

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

Polytropic compression
None of these
Isothermal compression
Isentropic compression

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Compressors, Gas Turbines and Jet Engines
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁² -v₂²)/2g
(v₁ - v₂)²/2g
(v₁² -v₂²)/g
(v₁ - v₂)²/g

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Compressors, Gas Turbines and Jet Engines
In jet engines, for the efficient production of large power, fuel is burnt in an atmosphere of

Compressed air
Oxygen alone
Vacuum
Atmospheric air

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Compressors, Gas Turbines and Jet Engines
The maximum compression ratio in an actual single stage axial flow compressor is of the order of

0.043055555555556
0.00070833333333333
0.045138888888889
0.048611111111111

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Compressors, Gas Turbines and Jet Engines
The compressor performance at higher altitude compared to sea level will be

Higher
Lower
Same
Dependent on other factors

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