Compressors, Gas Turbines and Jet Engines
Stalling of blades in axial flow compressor is the phenomenon of

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

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Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct as regard to centrifugal compressors?

The static pressure of air in the impeller increases in order to provide centripetal force on the air
The maximum efficiency is higher than multistage axial flow compressors
The impeller rotates at high speeds
The flow of air is parallel to the axis of the compressor

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