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

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

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

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

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