Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

Its functioning does not depend on presence of air
The propulsive matter is caused to flow around the propelled body
All of these
Propulsive matter is ejected from within the propelled body

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

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
Volume of air sucked by the compressor during its suction stroke

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