Compressors, Gas Turbines and Jet Engines
The mean effective pressure of the compressor is the

Volume of air delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
None of these

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

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