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

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

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

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
None of the listed here

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Stroke volume and clearance volume
Absolute discharge pressure to the absolute intake pressure
Pressures at discharge and suction corresponding to same temperature
Gauge discharge pressure to the gauge intake pressure

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