[vo] (b) Determine the ideal head-discharge relationship for a backward-curved vaned radial-flow pump having following dimensions: rotor radii at inlet and exit 75mm and 125mm respectively, rotor width at inlet and exit 37.5mm and 25mm respectively, vane angle at exit 22. The pump has radial inflow and operates at 1440rpm. What is the design flow rate, if the inlet vane angle is 14"? [12]