Compressors, Gas Turbines and Jet Engines
The pressure and temperature conditions of air at the suction of compressor are

Slightly less than atmospheric
Atmospheric
Pressure slightly less than atmospheric and temperature slightly more than atmospheric
Slightly more than atmospheric

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

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

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