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

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Compressors, Gas Turbines and Jet Engines
The compressor capacity is defined as the

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

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