Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Heated
Exhaust gases drive the compressor
Bled gas from turbine is heated and readmitted for complete expansion
Compressed air before entering the combustion chamber is heated

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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