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Compressors, Gas Turbines and Jet Engines

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

Constant speed unloader
Relief valve
Start-stop motor
Variable speed

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Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Air stream blocking the passage
Air stream not able to follow the blade contour
Unsteady, periodic and reversed flow
Motion of air at sonic velocity

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Compressors, Gas Turbines and Jet Engines
When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

More than
Less than
None of these
Equal to

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Compressors, Gas Turbines and Jet Engines
The air-fuel ratio in gas turbines is of the order of

30: 1
15: 1
50: 1.
7: 1

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Compressors, Gas Turbines and Jet Engines
For speed above 3000 km/hour, it is more advantageous to use

Turbojet engine
Ramjet engine
Rockets
Propellers

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Compressors, Gas Turbines and Jet Engines
Axial flow compressor has the following advantage over centrifugal compressor

Higher average velocities
Aerofoil blades are used
Larger air handling ability per unit frontal area
Higher pressure ratio per stage

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