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
Correct Answer : (A)

(1 + cos φ)/2

Hints :

According to Bernoulli's equation for steady ideal fluid flow


A Francis turbine is used when the available head of water is

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