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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The criterion of the thermodynamic efficiency for rotary compressor is

Polytropic compression
None of the listed here
Isentropic compression
Isothermal compression

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Compressors, Gas Turbines and Jet Engines
Mechanical efficiency of gas turbines as compared to I.C engines is

None of these
Lower
Same
Higher

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Compressors, Gas Turbines and Jet Engines
Diffuser in a compressor is used to

Convert pressure energy into kinetic energy
Make the flow streamline
Convert kinetic energy into pressure energy
Increase velocity

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Compressors, Gas Turbines and Jet Engines
Which of the following fuels can be used in turbojet engines?

Liquid hydrogen
High speed diesel oil
Kerosene
Methyl alcohol

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Compressors, Gas Turbines and Jet Engines
Reheating in a multistage expansion gas turbine ________ compressor work.

Has no effect on
None of these
Decreases
Increases

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of air compressors is of the order of

40 - 50%
20 - 30%
60 - 70%
70 - 90%

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