Compressors, Gas Turbines and Jet Engines
When air is to be compressed at a high pressure, then it is advantageous to use

None of these
Multistage compression without intercooling
Single stage compression
Multistage compression with intercooling

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of the compressor is defined as the ratio of

Isentropic power to the power required to drive the compressor
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Volume of free air delivery per stroke to the swept volume of the piston

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