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Extracted text: A centrifugal pump running at 500 rpm and at its maximum efficiency is delivering a head of 30 m at a flow rate of 60 litres per minute. If the rpm is changed to 1000, then the head H in metres and flow rate Q in litres per minute at maximum efficiency are estimated to be (a) H= 60, Q = 120 (b) H= 120, Q = 120 (c) H= 60, Q = 480 (d) H= 120, Q = 30 %3D %3D %3D %3D %3D %3D %3D