The maximum hydraulic efficiency of an impulse turbine is (where φ = – McqOptions

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

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