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

Question

A. V_b = 0.5 V cosα

B. V_b = V cosα

C. V_b = 0.5 V² cosα

D. V_b = V² cosα

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Accepted Answer

A. V_b = 0.5 V cosα

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)