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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The compressor capacity with decrease in suction temperature

Remain unaffected
May increase or decrease depending on compressor capacity
Decreases
Increases

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

Reduce turbine size
Increase temperature
Increase power output
Increase speed

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Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

U < Vo
Vt > Vo
Vi = Vo
V = Uo

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Compressors, Gas Turbines and Jet Engines
The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the

Total temperature drop
Total temperature drop in the stage
Adiabatic temperature drop in the stage
Total adiabatic temperature drop

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Compressors, Gas Turbines and Jet Engines
The capacity of a compressor is 5 m/min refers to

Compressed air
Free air
Standard air
Compressed air at delivery pressure

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Compressors, Gas Turbines and Jet Engines
Pick up the wrong statement about advantages of multistage compression

More loss of air due to leakage past the cylinder
Better lubrication is possible advantages of multistage
Air can be cooled perfectly in between
Mechanical balance is better

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