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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)

Vb = 0.5 V cos α
Vb = V cos α
Vb = 0.5 V2 cos α
Vb = V2 cosα

Correct Answer: Vb = 0.5 V cos α

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