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

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

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

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
Volume of air delivered by the compressor

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