Compressors, Gas Turbines and Jet Engines
Isothermal compression though most efficient, but is not practicable because

It requires very big cylinder
It does not increase pressure much
It is impossible in practice
Compressor has to run at very slow speed to achieve it

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

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

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Compressors, Gas Turbines and Jet Engines
Inter-cooling in gas turbine results in

Increase in net output but decrease in thermal efficiency
Increase in both thermal efficiency and net output
Increase in thermal efficiency but decrease in net output
Decrease in both thermal efficiency and net output

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