Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

The propulsive matter is caused to flow around the propelled body
Its functioning does not depend on presence of air
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

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
Volume of air delivered by the compressor
None of the listed here

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

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

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
One adiabatic, one isobaric and two constant volumes
One adiabatic, two isobaric, and one constant volume
Two adiabatic, one isobaric and one constant volume

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