Compressors, Gas Turbines and Jet Engines
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

Mechanical efficiency
Volumetric efficiency
Isothermal efficiency
Compressor efficiency

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

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

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