With reference to centrifugal pumps (a) State the operating principle of a centrifugal pump and why it is unnecessary to fit a relief valve to it (2) (b) State TWO impeller types, explaining which type of application EACH would be best suited for (4) (c) Explain why cavitation occurs and how it is reduced by design (4)
Pumps & system
UKM Tuticorin 
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