Compressors, Gas Turbines and Jet Engines
For a two stage compressor, if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will

Decrease
Remain unaffected
Increase
Other factors control it

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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