Question: 69. A model pump with a 40-cm-diameter impeller requires a 9-kW power input when operating at a speed of 1500 rpm against a head

69. A model pump with a 40-cm-diameter impeller requires a 9-kW power input when operating at a speed of 1500 rpm against a head of 7.5 m. A homologous pump 1.9 m in diameter will operate at the same efficiency against a 15-m. What speed input would be expected? A. 540 rpm B. 434 rpm C. 447 rpm D. 745 rpm

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