Compressors, Gas Turbines and Jet Engines
Propulsive efficiency is defined as ratio of

Propulsive power and fuel input
Thrust power and fuel energy
Engine output and propulsive power
Thrust power and propulsive power

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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
In the axial flow gas turbine, the work ratio is the ratio of

Output and input
Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
Actual compressor work and theoretical compressor work
Compressor work and turbine work

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