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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The main purpose of reheating in gas turbine is to

Increase power output
Reduce turbine size
Increase speed
Increase temperature

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Compressors, Gas Turbines and Jet Engines
Maximum work is done in compressing air when the compression is

Polytropic
Adiabatic
None of these
Isothermal

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Compressors, Gas Turbines and Jet Engines
The maximum delivery pressure in a rotary air compressor is

50 bar
30 bar
10 bar
20 bar

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

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

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Compressors, Gas Turbines and Jet Engines
In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.

Outlet whirl velocity
Outlet velocity of flow
Inlet velocity of flow
Inlet whirl velocity

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

Decrease the delivery temperature for ease in handling
Reduce volume
Cause moisture and oil vapour to drop out
Cool the air

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