Compressors, Gas Turbines and Jet Engines
The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

Isothermal efficiency
Compressor efficiency
Volumetric efficiency
Mechanical efficiency

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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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