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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Water is injected in gas turbine cycle to

Increase efficiency
Control output of turbine
Control temperature
Control fire hazards

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Compressors, Gas Turbines and Jet Engines
For perfect intercooling in a two stage compressor

p₁/p₃ = p₂/p₁
p₁ = p₂ p3
p₂/p₁ = p₃/p₂
p₁ = p3

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Compressors, Gas Turbines and Jet Engines
High air-fuel ratio in gas turbines

Do not damage turbine blades
Reduces exhaust temperature
Increases power output
Improves thermal efficiency

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Compressors, Gas Turbines and Jet Engines
Surging is the phenomenon of

Air stream not able to follow the blade contour
Air stream blocking the passage
Unsteady, periodic and reversed flow
Motion of air at sonic velocity

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Compressors, Gas Turbines and Jet Engines
Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

Lower volumetric efficiency
Better mechanical balance
Less loss of air due to leakage past the cylinder
Less power requirement

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Compressors, Gas Turbines and Jet Engines
The maximum propulsion efficiency of a turbojet is attained at around following speed

1700 km/hr
1050 km/hr
550 km/hr
2400 km/hr

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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