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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Gas turbines for power generation are normally used

To supply peak load requirements
In emergency
To supply base load requirements
To enable start thermal power plant

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Compressors, Gas Turbines and Jet Engines
The performance of air compressor at high altitudes will be ________ as compared to that at sea level.

None of these
Higher
Same
Lower

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

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

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Compressors, Gas Turbines and Jet Engines
Propulsion efficiency of the following order is obtained in practice

0.5
0.6
0.72
0.34

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Compressors, Gas Turbines and Jet Engines
For perfect intercooling in a two stage compressor

p₁ = p₂ p3
p₂/p₁ = p₃/p₂
p₁ = p3
p₁/p₃ = p₂/p₁

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Compressors, Gas Turbines and Jet Engines
It is not possible to use closed gas turbine cycle in aeronautical engines because

None of these
It requires cooling water for its operation
It is bulky
It is inefficient

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