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Question

Q5. With reference to centrifugal pumps

(a) Sketch 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)

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