Compressors, Gas Turbines and Jet Engines
Pick up the wrong statement about advantages of multistage compression

Mechanical balance is better
More loss of air due to leakage past the cylinder
Air can be cooled perfectly in between
Better lubrication is possible advantages of multistage

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

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

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