Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor, without clearance, the work-done on the air during isentropic compression is ________ the heat required to raise the temperature of air from T₁ to T₂ at a constant pressure.

Greater than
Less than
None of these
Equal to

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

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

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