Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

Increases with increase in compression ratio
May increase/decrease depending on compressor capacity
In not dependent upon compression ratio
Decreases with increase in compression ratio

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Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct as regard to centrifugal compressors?

The maximum efficiency is higher than multistage axial flow compressors
The flow of air is parallel to the axis of the compressor
The static pressure of air in the impeller increases in order to provide centripetal force on the air
The impeller rotates at high speeds

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Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Increase first at fast rate and then slow
First increase, reach maximum and then decrease
Increase first at slow rate and then fast
Decrease continuously

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