A Pelton wheel is required to develop a shaft power of 6 MW when working under a head of 400 m. Total discharge through the wheel is 2 m3/s. What will be the overall efficiency of the Pelton wheel? [Density of water = 1000 kg/m3, Acceleration due to gravity = 10 m/s2]
1
75%
2
70%
3
80%
4
85%