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 L.P. turbine and L.P. compressor is connected to H.P. turbine
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
All are connected in series

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of the compressor is defined as the ratio of

Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Isentropic power to the power required to drive the compressor
Volume of free air delivery per stroke to the swept volume of the piston

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