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
Is not dependent upon compression ratio
May increase/decrease depending on compressor capacity

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Compressors, Gas Turbines and Jet Engines
Clearance volume in actual reciprocating compressors is essential

To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
To attain high volumetric efficiency
To accommodate Valves in the cylinder head
To provide cushioning effect

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