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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

0.9
0.85
0.75
0.99

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Does not change
Remain same
Decrease
Increase

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Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency, even when running at high speed, can be approached by using

Multistage compression
Cold water spray
Fully insulating the cylinder
Both (A) and (B) above

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Compressors, Gas Turbines and Jet Engines
Water is injected in gas turbine cycle to

Control fire hazards
Increase efficiency
Control temperature
Control output of turbine

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Compressors, Gas Turbines and Jet Engines
The ratio of isentropic work to Euler work is known as

Polytropic reaction
Slip factor
Work coefficient
Pressure coefficient

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Compressors, Gas Turbines and Jet Engines
The stagnation pressure rise in a centrifugal compressor takes place

In the impeller only
In the inlet guide vanes only
In the diffuser and impeller
In the diffuser only

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