Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

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

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Compressors, Gas Turbines and Jet Engines
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in subsequent stages should decrease
Work done in subsequent stages should increase
Work done in all stages should be equal
Work done in first stage should be more

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