Compressors, Gas Turbines and Jet Engines
In a jet propulsion

None of these
Its functioning does not depend upon presence of air
The propulsive matter is caused to flow around the propelled body
The propulsive matter is ejected from within the propelled body

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

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

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