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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Air-fuel ratio in a jet engine will be of the order of

0.62569444444444
2.5006944444444
0.41736111111111
0.83402777777778

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Compressors, Gas Turbines and Jet Engines
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.

Increased
None of these
Zero
Reduced

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Compressors, Gas Turbines and Jet Engines
The maximum delivery pressure in a rotary air compressor is

20 bar
50 bar
30 bar
10 bar

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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 capacity of compressor will be highest when its intake temperature is

Anything
Lowest
Atmospheric
Highest

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

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

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