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This post was last edited by 3983596_FPPZ on 2018-12-7 08:49. For bk15.jpg: Rules for multiple-choice questions: 1. If the answer to each question is incorrect, active participation will be rewarded with 2 Wealth points； 2. A correct answer rewards 6 wealth points ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for one management rating only ； 5. The answer and its explanation will be visible after responding ； 6. The reward is valid for 48 hours. Studying* and winning awards again; come by here every day. With all other conditions remaining unchanged, when the specific gravity of the medium pumped by the pump decreases, which of the following statements is correct? (Multiple choice) A. Flow rate remains unchanged. B. Head remains unchanged. C. Shaft power decreases. D. Outlet pressure remains unchanged. E. Flow rate decreases. F. Shaft power remains unchanged. G. Pump’s net positive suction head decreases. H. Head decreases. I. Outlet pressure decreases. J. Pump’s net positive suction head remains unchanged. Answers: A, B, C, I, J. This question tests basic concepts related to pumps: flow rate, head, and net positive suction head are inherent parameters of the pump itself, and they do not change regardless of operating conditions or changes in the medium. The only parameters that change with variations in specific gravity are outlet pressure and shaft power. lol