Compressors, Gas Turbines and Jet Engines
Ramjet engine

Requires no air for its operation
Produces a jet consisting of plasma
Is not self operating at zero flight speed
Is self operating at zero flight speed

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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