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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
A rocket engine uses __________ for the combustion of its fuel.

None of these
Its own oxygen
Compressed atmospheric air
Surrounding air

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Compressors, Gas Turbines and Jet Engines
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.

None of these
Increased
Reduced
Zero

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

To reduce the exit temperature
To save fuel
To increase the output
To increase the efficiency

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Compressors, Gas Turbines and Jet Engines
An after-cooler is used to

Reduce volume of air
Cause moisture and oil vapour to drop out
Remove impurities from air
Cool the air

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Compressors, Gas Turbines and Jet Engines
In a single stage, single acting reciprocating air compressor, without clearance volume, the work-done is minimum during

Isentropic compression
Isothermal compression
None of these
Polytropic compression

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Compressors, Gas Turbines and Jet Engines
The compression ratio in a gas turbine is of the order of

0.20902777777778
0.50069444444444
0.33402777777778
3.5 : 1

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