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

Decrease
Other factors control it
Remain unaffected
Increase

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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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