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
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

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

The propulsive matter is caused to flow around the propelled body
None of these
Its functioning does not depend upon presence of air
The propulsive matter is ejected from within the propelled body

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