Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor without clearance volume

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

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Pressures at discharge and suction corresponding to same temperature
Absolute discharge pressure to the absolute intake pressure

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