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

Power to drive compressor to isothermal h.p.
Work to compress air isothermally to work for actual compression
Isothermal h.p. to the BHP of motor
Isothermal h.p. to adiabatic h.p.

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Compressors, Gas Turbines and Jet Engines
The overall efficiency of the compressed air system is the

Product of shaft output of air motor and shaft input to the compressor
Ratio of shaft output of the air motor to the shaft input to the compressor
Ratio of shaft input to the compressor to the shaft output of air motor
None of these

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