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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is

Equal
Can't be compared
Lower
Higher

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Compressors, Gas Turbines and Jet Engines
The net work input required for compressor with increase in clearance volume

Increases/decreases depending on compressor capacity
Remains same
Decreases
Increases

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Compressors, Gas Turbines and Jet Engines
Gas turbines use following type of air compressor

Lobe type
Axial flow type
Reciprocating type
Centrifugal type

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Compressors, Gas Turbines and Jet Engines
More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

10 kg/cm²
6 kg/cm²
2 kg/cm²
14.7 kg/cm²

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

5%
1.0%
0.1%
0.5%

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Compressors, Gas Turbines and Jet Engines
The ratio of the discharge pressure to the inlet pressure of air is called

Expansion ratio
Volumetric efficiency
Compression ratio
Compressor efficiency

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