Question: The scaling ratios for centrifugal pumps are Q/ND3 = constant, W(ND)2 = constant, where Q is the volumetric flow rate (ft3/sec), H is the pump head (ft), and N is rotational speed (rpm). Determine the head and discharge of a 1:4 model of a centrifugal pump that produces 20 ft3/s at a head of 96 ft when turning 240 rpm. The model operates at 1,200 rpm.