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Compressors, Gas Turbines and Jet Engines

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

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

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor resembles

Turbine
Reciprocating pump
Sliding vane compressor
Centrifugal pump

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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

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

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.001
0.005
0.05
0.01

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Compressors, Gas Turbines and Jet Engines
In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

0°C and 1 kg/cm²
Intake temperature and pressure conditions
N.T.P. conditions
20°C and 1 kg/cm²

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Compressors, Gas Turbines and Jet Engines
The air is delivered ________ in one revolution in case of a three lobbed rotor.

Four times
Two times
Three times
Six times

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