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

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

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Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Heated
Compressed air before entering the combustion chamber is heated
Exhaust gases drive the compressor
Bled gas from turbine is heated and readmitted for complete expansion

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