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
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Compressed air before entering the combustion chamber is heated
Bled gas from turbine is heated and readmitted for complete expansion
Heated
Exhaust gases drive the compressor

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Compressors, Gas Turbines and Jet Engines
Clearance volume in actual reciprocating compressors is essential

To provide cushioning effect
To attain high volumetric efficiency
To accommodate Valves in the cylinder head
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

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