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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 `alpha` = Nozzle angle)


Options:
A .  `V_b = 0.5 V cos alpha`
B .  `V_b = V cos alpha`
C .  `V_b = 0.5 V^2 cos alpha`
D .  `V_b = V^2 cos alpha`
Answer: Option A



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