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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The efficiency of roots blower ________ with the increase in pressure ratio.

Increases
Decreases
Does not change
None of these

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Compressors, Gas Turbines and Jet Engines
It is not possible to use closed gas turbine cycle in aeronautical engines because

It requires cooling water for its operation
None of these
It is bulky
It is inefficient

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Compressors, Gas Turbines and Jet Engines
The following property is most important for material used for gas turbine blade

Creep
Corrosion resistance
Toughness
Fatigue

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

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

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

Its own oxygen
None of these
Surrounding air
Compressed atmospheric air

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Compressors, Gas Turbines and Jet Engines
A simple turbojet engine is basically

A propeller system
Ramjet engine
Chemical rocket engine
Gas turbine engine equipped with a propulsive nozzle and diffuse

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