Compressors, Gas Turbines and Jet Engines
For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

Increase
Decrease
Remain unaffected
Other factors control it

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

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

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