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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The hottest point in a gas turbine is

in the center
at the tip
at the base
between ~ to i of the blade height

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

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

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

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

Decreases
Does not change
None of these
Increases

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Compressors, Gas Turbines and Jet Engines
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as

Compressor efficiency
Volumetric efficiency
Mechanical efficiency
Isothermal efficiency

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Compressors, Gas Turbines and Jet Engines
Work ratio of a gas turbine may be improved by

Increasing the compression work
Increasing the turbine work
Both (A) and (C) above
Decreasing the compression work

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