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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Gas turbine as compared to internal combustion engine

Has more efficiency
Produces uniform torque
Can be driven at a very high speed
All of the listed here

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Compressors, Gas Turbines and Jet Engines
Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is

Higher
Lower
Equal
Can't be compared

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Compressors, Gas Turbines and Jet Engines
In jet engines, paraffin is usually used as the fuel because of its

High calorific value
Low freezing point
Ease of atomisation
Both (A) and (C) above

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Compressors, Gas Turbines and Jet Engines
Reheating in a gas turbine

Increases the turbine work
Decreases the thermal efficiency
Increases the compressor work
Increases the thermal efficiency

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Compressors, Gas Turbines and Jet Engines
Which is false statement about multistage compression?

Volumetric efficiency is high
The moisture in air is condensed in the inter-cooler
It is best suited for compression ratios around 7:1
Power consumption per unit of air delivered is low

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Compressors, Gas Turbines and Jet Engines
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

Remain same
Increase
Decrease
None of these

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