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COMPRESSORS, GAS TURBINES AND JET ENGINES

Compressors, Gas Turbines and Jet Engines
The efficiency of roots blower ________ with the increase in pressure ratio.

Decreases
Increases
None of these
Does not change

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Compressors, Gas Turbines and Jet Engines
During peak load periods, the best method of controlling compressors is

Constant speed unloader
Start-stop motor
Relief valve
Variable speed

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Compressors, Gas Turbines and Jet Engines
Inter cooling in compressors

Is the standard practice for big compressors
Enables compression in two stages
Results in saving of power in compressing a given volume to given pressure
Cools the delivered air

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Compressors, Gas Turbines and Jet Engines
Isothermal compression efficiency can be attained by running the compressor

At zero speed
At very high speed
At average speed
At very slow speed

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Compressors, Gas Turbines and Jet Engines
Fighter bombers use following type of engine

Ramjet
Turbo-propeller
Rocket
Turbojet

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