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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
A rocket works with maximum overall efficiency when air craft velocity is equal to the

Average of the jet velocity
Half the jet velocity
Jet velocity
Twice the jet velocity

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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
Higher
Same
None of these

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Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency, even when running at high speed, can be approached by using

Multistage compression
Cold water spray
Fully insulating the cylinder
Both (A) and (B) above

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Compressors, Gas Turbines and Jet Engines
The advantage of multistage compression over single stage compression is

Higher volumetric efficiency
Decreased discharge temperature
Lower power consumption per unit of air delivered
All of these

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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 maximum during

Isentropic compression
Polytropic compression
Isothermal compression
None of these

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