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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
The degree of reaction is usually kept ________ for all types of axial flow compressors.

0.3
0.2
0.5
0.4

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Compressors, Gas Turbines and Jet Engines
The material commonly used for air craft gas turbine is

Duralumin
Timken, Haste alloys
High alloy steel
Stainless steel

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Compressors, Gas Turbines and Jet Engines
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁ - v₂)²/g
(v₁ - v₂)²/2g
(v₁² -v₂²)/2g
(v₁² -v₂²)/g

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Compressors, Gas Turbines and Jet Engines
The air power of the compressor is also known as

Frictional power
Indicated power
None of these
Brake power

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Compressors, Gas Turbines and Jet Engines
Mining industry usually employs following motive power

Compressed air
Diesel engine
C. electric motor
Petrol engine

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