The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

  • Ad = (D⁵/8fl)1/2
  • Bd = (D⁵/8fl)1/3
  • Cd = (D⁵/8fl)1/4
  • Dd = (D⁵/8fl)1/5
Correct Answer : (C)

d = (D⁵/8fl)1/4

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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