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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor decreases with ________ in compression ratio.

Increase
Decrease
Does not change
Remain same

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

Remove impurities from air
Cause moisture and oil vapour to drop out
Cool the air
Reduce volume of air

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Compressors, Gas Turbines and Jet Engines
Ram compression in turbojet involves

Compression of inlet air
Increasing speed of incoming air
Lost work
Reduction of speed of incoming air and conversion of part of it into pressure energy

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Compressors, Gas Turbines and Jet Engines
A closed gas turbine in which fuel is burnt directly in the air is not possible because of

Increasing gas temperature
High friction losses
Paucity of O2
High specific volume

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Compressors, Gas Turbines and Jet Engines
In jet propulsion power unit, the inlet duct of diverging shape is used in order to

Provide robust structure
Beautify the shape
Convert kinetic energy of air into pressure energy
Collect more air

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Compressors, Gas Turbines and Jet Engines
The ratio of isentropic work to Euler work is known as

Work coefficient
Slip factor
Polytropic reaction
Pressure coefficient

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