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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
An air compressor may be controlled by

Any one of the above
Blow off control
Clearance control
Throttle control

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Compressors, Gas Turbines and Jet Engines
A rocket works with maximum overall efficiency when air craft velocity is equal to the

Jet velocity
Half the jet velocity
Average of the jet velocity
Twice the jet velocity

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Compressors, Gas Turbines and Jet Engines
Propulsion efficiency of the following order is obtained in practice

0.34
0.5
0.72
0.6

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

Compressed atmospheric air
None of these
Surrounding air
Its own oxygen

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Compressors, Gas Turbines and Jet Engines
The closed cycle in gas turbines

In never used
Provides greater flexibility
Provides lesser flexibility
Is used when gas is to be burnt

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Compressors, Gas Turbines and Jet Engines
In gas turbines, high thermal efficiency is obtained in

Closed cycle
Closed cycle & Open cycle
Closed/open depending on other considerations
Open cycle

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