The single-jet Pelton wheel in the figure is supplied from a reservoir through a penstock; the gross head (reservoir level to nozzle axis), the penstock loss, the nozzle data, the speed ratio (based on the net head), the speed and the overall efficiency are marked on the figure. Determine (a) the jet velocity (answer in m/s), (b) the mean (pitch-circle) diameter of the wheel (answer in m) and (c) the shaft power developed (answer in kW).