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Question
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the
Options:
A .  Blades are equiangular
B .  Blade velocity coefficient is unity
C .  Blades are equiangular and frictionless
D .  Blade solidity is 0.65
Answer: Option C

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