The maximum hydraulic efficiency of an impulse turbine is (where $$\varphi $$ = Angle of blade tip at outlet)
A. $$\frac{{1 + \cos \varphi }}{2}$$
B. $$\frac{{1 - \cos \varphi }}{2}$$
C. $$\frac{{1 + \sin \varphi }}{2}$$
D. $$\frac{{1 - \sin \varphi }}{2}$$
Answer: Option A

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