Question

A centrifugal pump having outer diameter equal to two times the inner diameter and running at 1200 r.p.m. works against a total head of 75 m. The velocity of flow through the impeller is constant and equal to 3m/s. The vanes are set back at an angle of 30degrees at outlet. If the outer diameter of the impeller is 600 mm and width at outlet is 50 mm, determine (i) vane angle at inlet, (b) work done per second by impeller, (c) manometric efficiency.​