Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Motion of air at sonic velocity
Unsteady, periodic and reversed flow
Air stream not able to follow the blade contour
Air stream blocking the passage

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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

Increases net output but decreases thermal efficiency
Decreases net output and thermal efficiency both
Decreases net output but increases thermal efficiency
Increases net output and thermal efficiency both

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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