Following data of a centrifugal pump are given as: Diameter at inlet (=0.4 mathrm{~m}); Diameter at outlet

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Following data of a centrifugal pump are given as: Diameter at inlet \(=0.4 \mathrm{~m}\); Diameter at outlet \(=1.0 \mathrm{~m} ;\) Speed \(=400 \mathrm{rpm}\); Flow rate \(=2000\) liters \(/ \mathrm{sec}\); Vane exit angle \(=30^{\circ}\); Velocity of flow \(=3 \mathrm{~m} / \mathrm{sec} ;\) head \(=10 \mathrm{~m}\). Find the least speed to start the pump and Manometric efficiency.

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