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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation

5%
1.0%
0.1%
0.5%

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Compressors, Gas Turbines and Jet Engines
What will be the volume of air at 327°C if its volume at 27°C is 1.5 m³/ mt?

18 m³/ mt.
6 m³/ mt.
3 m³/ mt.
1.5 m³/ mt.

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Compressors, Gas Turbines and Jet Engines
The compression ratio in a gas turbine is of the order of

0.20902777777778
0.33402777777778
0.50069444444444
3.5 : 1

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Compressors, Gas Turbines and Jet Engines
A turboprop is preferred to turbojet because

It has high propulsive efficiency at high speeds
It can fly at high elevations
It has high power for take off
It can fly at supersonic speeds

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Compressors, Gas Turbines and Jet Engines
More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

2 kg/cm²
6 kg/cm²
14.7 kg/cm²
10 kg/cm²

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Compressors, Gas Turbines and Jet Engines
Ram compression in turbojet involves

Lost work
Increasing speed of incoming air
Reduction of speed of incoming air and conversion of part of it into pressure energy
Compression of inlet air

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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