Compressors, Gas Turbines and Jet Engines
The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is

Superheating in compressor
Clearance volume and leakages
All of these
Pressure drop across the valves

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Compressors, Gas Turbines and Jet Engines
In the cross compounding of the gas turbine plant

Both the arrangements can be employed
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
All are connected in series
H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine

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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

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

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