Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

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

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Compressors, Gas Turbines and Jet Engines
Clearance volume in actual reciprocating compressors is essential

To provide cushioning effect
To attain high volumetric efficiency
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
To accommodate Valves in the cylinder head

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

Volume of air delivered by the compressor
None of the listed here
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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