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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The work done per unit mass of air in compression will be least when 'n' is equal to

1
1.2
1.3
1.4

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Compressors, Gas Turbines and Jet Engines
A machine used to raise the pressure of air is called

Air motor
I.C engine
Compressor
Gas turbine

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Compressors, Gas Turbines and Jet Engines
A compressor at high altitude will draw

Same power
Less power
More/less power depending on other factors
More power

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Compressors, Gas Turbines and Jet Engines
Phenomenon of choking in compressor means

No flow of air
Fixed mass flow rate regardless of pressure ratio
Reducing mass flow rate with increase in pressure ratio
Increased inclination of chord with air steam

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Compressors, Gas Turbines and Jet Engines
In a high pressure compressor, the delivery pressure is

8 to 10 bar
1 to 5 bar
5 to 8 bar
10 to 15 bar

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of air compressors is of the order of

40 - 50%
60 - 70%
20 - 30%
70 - 90%

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