Compressors, Gas Turbines and Jet Engines
The work ratio of a gas turbine plant is defined as the ratio of

Net work output and isentropic heat drop
Net work output and heat supplied
Net work output and work done by turbine
Actual heat drop and isentropic heat drop

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

Increases with increase in compression ratio
May increase/decrease depending on compressor capacity
Decreases with increase in compression ratio
In not dependent upon compression ratio

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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 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

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