Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
One adiabatic, two isobaric, and one constant volume
One adiabatic, one isobaric and two constant volumes
Two adiabatic, one isobaric and one constant volume

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Compressors, Gas Turbines and Jet Engines
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in all stages should be equal
Work done in subsequent stages should decrease
Work done in first stage should be more
Work done in subsequent stages should increase

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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 flow of air is parallel to the axis of the compressor
The impeller rotates at high speeds

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