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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The stagnation pressure rise in a centrifugal compressor takes place

In the diffuser only
In the diffuser and impeller
In the inlet guide vanes only
In the impeller only

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Compressors, Gas Turbines and Jet Engines
In open cycle turbojet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the

Thrust and range of aircraft
None of these
Both (A) and (B)
Efficiency of the engine

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Compressors, Gas Turbines and Jet Engines
In a four stage compressor, if the pressure at the first and third stage is 1 bar and 16 bar, then the delivery pressure at the fourth stage will be

16 bar
1 bar
256 bar
64 bar

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Compressors, Gas Turbines and Jet Engines
The hottest point in a gas turbine is

in the center
between ~ to i of the blade height
at the base
at the tip

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Compressors, Gas Turbines and Jet Engines
In jet engines the products of combustion after passing through the gas turbine are discharged into

Vacuum
Back to the compressor
Discharge nozzle
Atmosphere

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

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

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