Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

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

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Pressures at discharge and suction corresponding to same temperature
Absolute discharge pressure to the absolute intake pressure

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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
The propulsive matter is ejected from within the propelled body
Its functioning does not depend upon presence of air

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