Compressors, Gas Turbines and Jet Engines
For minimum work required to compress and deliver a quantity of air by multistage compression

The work-done in each stage should be same
The compression ratio in each stage should be same
All of the listed here
The intercooling should be perfect

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

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

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