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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.

Surrounding air
None of these
Compressed atmospheric air
Its own oxygen

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Compressors, Gas Turbines and Jet Engines
Reheating in a gas turbine

Increases the turbine work
Increases the compressor work
Increases the thermal efficiency
Decreases the thermal efficiency

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Compressors, Gas Turbines and Jet Engines
The working fluid in a turbine is

In three phases
In a single phase
In the form of air and water mixture
In two phases

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Compressors, Gas Turbines and Jet Engines
Isothermal compression though most efficient, but is not practicable because

It does not increase pressure much
It requires very big cylinder
It is impossible in practice
Compressor has to run at very slow speed to achieve it

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

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

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Higher pressure ratio per stage
Aerofoil blades are used
Larger air handling ability per unit frontal area
Higher average velocities

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