Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Turbine blades, which is essentially an isentropic process
Exit nozzle, which is a constant volume process
Turbine blades, which is a constant volume process
Exit nozzle, which is essentially an isentropic process

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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