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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 cosα

B. Vb = V cosα

C. Vb = 0.5 V² cosα

D. Vb = V² cosα

Correct Answer : A.


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