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Question
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)
Options:
A .  Vb = 0.5 V cosα
B .  Vb = V cosα
C .  Vb = 0.5 V² cosα
D .  Vb = V² cosα
Answer: Option A
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