Mechanical Engineering - Steam Nozzles and Turbines - Discussion

36. 

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

[A]. Vb = 0.5 V cos α
[B]. Vb = V cos α
[C]. Vb = 0.5 V2 cos α
[D]. Vb = V2 cosα

Answer: Option A

Explanation:

No answer description available for this question.

Nabamhinapapu@Gmail.Com said: (Sep 23, 2016)  
None of the answers is correct. Answer option A is optimum velocity ratio.

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