3) At the power station, a Pelton wheel produces 1260kW under a head of 610m. The loss of head due to pipe friction between the reservoir and nozzle is 46m. The buckets of the Pelton wheel deflect the jet through an angle of 165°, while relative velocity of water is reduced by 10% due to bucket friction. The bucket to jet speed ratio is 0.46. The bucket circle diameter of the wheel is 890mm and there are two jets. Find the theoretical hydraulic efficiency, speed of the wheel and the diameter of the nozzle if the actual hydraulic efficiency is 0.9 times the calculated above. Assume nozzle velocity coefficient Cv = 0.98 Solution