Question

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.

blade solidity is 0.65

d.

blades are equiangular and frictionless

Answer: (d).blades are equiangular and frictionless

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Q. 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 ____________

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