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

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

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Compressors, Gas Turbines and Jet Engines
The assumption made in two stage compression with inter-cooler is that

There is no pressure drop in the inter-cooler
The compression in both the cylinders is polytropic
The suction and delivery of air takes place at constant pressure
All of the listed here

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