# Q.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)

• Bd = (D⁵/8fl)1/3
• Cd = (D⁵/8fl)1/4
• Dd = (D⁵/8fl)1/5