Compressors, Gas Turbines and Jet Engines
The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio

First decreases and then increases
First increases and then decreases
Decreases
Increases

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

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

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Pressures at discharge and suction corresponding to same temperature
Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Absolute discharge pressure to the absolute intake pressure

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