Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
One adiabatic, two isobaric, and one constant volume
Two adiabatic, one isobaric and one constant volume
One adiabatic, one isobaric and two constant volumes

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

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

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Compressors, Gas Turbines and Jet Engines
In air compressors, free air delivery means the

None of the listed here
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
Volume of air sucked by the compressor during its suction stroke
Volume of air delivered by the compressor

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