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

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

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Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Output and input
Actual compressor work and theoretical compressor work
Compressor work and turbine work
Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet

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