Compressors, Gas Turbines and Jet Engines
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

Remain same
None of these
Decrease
Increase

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor without clearance volume

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

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Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Compressor work and turbine work
Actual compressor work and theoretical compressor work
Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
Output and input

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