Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Pressures at discharge and suction corresponding to same temperature
Absolute discharge pressure to the absolute intake pressure
Stroke volume and clearance volume
Gauge discharge pressure to the gauge intake pressure

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

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

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