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 delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
None of the listed here

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor without clearance volume

Increases with increase in compression ratio
Is not dependent upon compression ratio
May increase/decrease depending on compressor capacity
Decreases with increase in compression ratio

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