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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The propulsive power of the rocket is (where v₁ = Jet velocity, and v₂ = Aircraft velocity)

(v₁² -v₂²)/2g
(v₁² -v₂²)/g
(v₁ - v₂)²/g
(v₁ - v₂)²/2g

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Compressors, Gas Turbines and Jet Engines
The ratio of work done per cycle to the swept volume in case of compressor is called

Compression ratio
Compressor efficiency
Mean effective pressure
Compression index

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Compressors, Gas Turbines and Jet Engines
Reheating in a gas turbine

Increases the compressor work
Decreases the thermal efficiency
Increases the thermal efficiency
Increases the turbine work

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Compressors, Gas Turbines and Jet Engines
Gas turbine as compared to steam turbine

Requires less space for installation
Has less efficiency
Has compressor and combustion chamber
All of these

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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

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

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Compressors, Gas Turbines and Jet Engines
The axial flow compressor is preferred in aircraft gas turbines because of

Low frontal area
High pressure rise
None of the listed here
Higher thrust

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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