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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
0.99
0.75
0.85

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Compressors, Gas Turbines and Jet Engines
The pressure of air at the beginning of the compression stroke is ___ the atmospheric pressure.

Less than
More than
None of the listed here
Equal to

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Compressors, Gas Turbines and Jet Engines
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

Volumetric efficiency
Isothermal efficiency
Compressor efficiency
Mechanical efficiency

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Compressors, Gas Turbines and Jet Engines
Which is false statement about air receivers?

These are used to dampen pulsations
These act as reservoir to take care of sudden demands
These increase compressor efficiency
These knock out some oil and moisture

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Compressors, Gas Turbines and Jet Engines
High air-fuel ratio in gas turbines

Do not damage turbine blades
Reduces exhaust temperature
Increases power output
Improves thermal efficiency

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Compressors, Gas Turbines and Jet Engines
A closed cycle gas turbine gives ________ efficiency as compared to an open cycle gas turbine.

Same
Higher
None of these
Lower

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