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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
The minimum work required for a three stage reciprocating air compressor is ___ the work required for each stage.

Six times
Three times
Double
Equal to

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Compressors, Gas Turbines and Jet Engines
The absolute pressure of air at the outlet of a compressor is called

Critical pressure
None of the listed here
Back pressure
Discharge pressure

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

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

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Compressors, Gas Turbines and Jet Engines
To avoid moisture troubles, the compressed air main line should

Rise gradually towards the point of use
Drop gradually towards the point of use
Be laid vertically
Be laid exactly horizontally

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Compressors, Gas Turbines and Jet Engines
Gas turbine blades are given a rake

Opposite to the direction of motion of blades
Depending on the velocity
In the direction of motion of blades
Equal to zero

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