Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

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

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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