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Question

The maximum hydraulic efficiency of an impulse turbine is (where `phi` = Angle of blade tip at outlet)
Options:
A .  `(1 + cos phi)/(2)`
B .  `(1 - cos phi)/(2)`
C .  `(1 +sin phi)/(2)`
D .  `(1 - sin phi)/(2)`
Answer: Option A


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