With reference to centrifugal pumps: (a) sketch a double entry impeller showing directions of flow; (3) (b) explain why double entry impellers are fitted; (2) (c) explain, with the aid of a Head versus Flow diagram, why a two speed pump is preferable to throttling where high and low capacities are demanded for a large sea water circulating pump. (5)
Pumps & system
UKM Tuticorin 
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