Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

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

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of the compressor is defined as the ratio of

Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Isentropic power to the power required to drive the compressor
Volume of free air delivery per stroke to the swept volume of the piston

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