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

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

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Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Decrease continuously
Increase first at fast rate and then slow
First increase, reach maximum and then decrease
Increase first at slow rate and then fast

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