Discussion :: Compressors, Gas Dynamics and Gas Turbines - Section 1 (Q.No.3)
A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.
Answer: Option B
No answer description available for this question.
|Rekha said: (Feb 4, 2013)|
|Rocket is a non air breathing engine, which doesn't depends on air.
It depends only on jet velocity. So jet velocity should be more than its aircraft velocity in this case.
|Manoj said: (Oct 20, 2013)|
|According to kelvin planks statement we can't obtain the 100% efficiency. So we can't convert 100% work in another 100% work (i.e 100% velocity to another 100% velocity). It should be less then 100%.|
|Anuj said: (Jun 17, 2014)|
|It should be equal to because for maximum efficiency the aircraft should move to its maximum velocity. As we know,
F = m*(vj-vi).
|Aravindh.M said: (Aug 2, 2014)|
|Sigma = u/cj;
For maximum sigma = 0.5, So 1/2.
|Mahaboobbasha said: (Sep 28, 2016)|
|Absolute velocity of a non-air breathing rocks jet velocity is always greater than its air jet velocity.|
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