1. A centrifugal impeller is 25 cm outer diameter and 2.5 cm outer width has blade angle at outlet 30°. The pump develops 15 m manometric head of which 2.5 m is regained in the volute casing and discharge 60 L/s. If the hydraulic loss in the impeller is 1.8 m. There is no velocity of whirl at inlet, the velocity of flow is constant throughout the impeller and the velocity in both the suction and delivery pipes is 3.6 m/s. Find: the pump speed, the hydraulic efficiency and head loss in volute.

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