With reference to centrifugal pumps: (a) Explain the operating principle of a centrifugal pump, stating why it is necessary to fit a relief valve to it (3) (b) Explain why some pumps have a double entry impeller (2) (c) Describe a routine overhaul of a centrifugal pump, stating the inspections, measurements and possible replacement parts that may be required (5)
Pumps & system
UKM Tuticorin 
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