The impulse turbine rotor efficiency will have a maximum value of 0.5 cos² α, where α is the nozzle exit flow angle, if the

blade velocity coefficient is unity

blades are equiangular and frictionless

The impulse turbine rotor efficiency will have a maximum value of 0.5

1.	The impulse turbine rotor efficiency will have a maximum value of 0.5 cos² α, where α is the nozzle exit flow angle, if the
A.	blades are equiangular
B.	blade velocity coefficient is unity
C.	blades are equiangular and frictionless
D.	blade solidity is 0.65
Answer» D. blade solidity is 0.65