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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
During base load operation, the best method of controlling compressor is

Relief valve
Start-stop motor
Constant speed unloader
Variable speed

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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
Increases
None of these

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

Decrease of work ratio
Both (A) and (B) above
Decrease of thermal efficiency
Increase of work ratio

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

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

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

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

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Compressors, Gas Turbines and Jet Engines
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.

None of these
Reduced
Increased
Zero

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