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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of air compressors is of the order of

20 - 30%
70 - 90%
40 - 50%
60 - 70%

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Compressors, Gas Turbines and Jet Engines
A large clearance volume in a reciprocating compressor results in

Reduced volume flow rate
Increased volume flow rate
Lower delivery pressure
Lower suction pressure

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Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Double
Equal to
Three times
Six times

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Compressors, Gas Turbines and Jet Engines
Reheating in multistage expansion gas turbine results in

Decrease of heat loss in exhaust
Reduction in compressor work
High thermal efficiency
Maximum work output

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

5%
0.5%
1.0%
0.1%

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