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

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
Volume of air delivered by the compressor

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

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

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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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