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

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

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

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

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