In a hydro project, a turbine is mounted in such a way that it acquires a head of 52 m. The water discharge in the feeding penstock with the flow rate of 4000 l/s. If the head loss of 6 m takes place in the penstock and the power of 900 kW is extracted from the turbine, The hydraulic efficiency of the turbine can be considered as 90 %. What should be the residual head loss of the turbine? (Take g = 10 m/s2)
1
12 m
2
15 m
3
21 m
4
52 m