A Pelton wheel is designed to develop 6000 kW under a net head of 300 m while running at 550 rpm. The overall efficiency is 85%, and the ratio of jet diameter to wheel diameter is 110. If the velocity coefficient Kv = 0.98 and speed ratio Ku = 0.46, the number of jets required is:

A Pelton wheel having semi-circular buckets works under a head of 140 m. It runs at 600 rpm. The discharge through the nozzle is 500 L/s, and the wheel diameter is 0.6 m. The coefficient of velocity of the jet is 0.98. Find: (a) Power available at the nozzle (b) Hydraulic efficiency of the wheel

A 13,240 kW Francis turbine runs at 150 rpm under a net head of 27 m. The effective atmospheric pressure head is 10.6 m of water. The draft tube must extend at least 0.77 m below the tail race level. The maximum permissible height of a straight conical draft tube above the tail race level is approximately: