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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Work ratio of a gas turbine may be improved by

Increasing the compression work
Both (A) and (C) above
Increasing the turbine work
Decreasing the compression work

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Compressors, Gas Turbines and Jet Engines
Adiabatic compression is one in which

No heat leaves or enters the compressor cylinder during compression
Temperature rise follows a linear relationship
Temperature during compression remains constant
Work done is maximum

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Compressors, Gas Turbines and Jet Engines
The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is

Less
Same
More/less depending on compressor capacity
More

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Compressors, Gas Turbines and Jet Engines
The thermodynamic efficiency of rotary compressor is based on

Polytropic compression
Isentropic compression
Adiabatic compression
Isothermal compression

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of air compressors is of the order of

70 - 90%
20 - 30%
60 - 70%
40 - 50%

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

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

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