A pump is designed with a backward-flow radial impeller having an outer diameter of 50 cm and an inner diameter of 25 cm. The pump runs at 1500 rpm. The impeller vanes are set at a blade angle of 45 at the outlet with respect to the tangential direction. Assume zero swirl at inlet and neglect slip at exit. The flow velocity through the impeller is constant at 3 m/s and the hydraulic efficiency NH is 85%. Calculate, (a) The value of swirl at exit (b) The head developed by the pump. (c) The blade angle at inlet. 482 B. 93