【Daily Question: Pump Equipment】Multiple-choice Question 2018.12.4

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Multiple-choice rules: 1. For each incorrect answer, active participation earns a reward of 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. Which of the following statements about water pumping devices is correct? (Single choice): A. The inlet pipe is generally under positive pressure, while the outlet pipe is generally under negative pressure. B. A centrifugal pump installed above the water surface of the inlet tank can be started directly without the need for priming. C. A centrifugal pump installed above the water surface of the inlet tank must be primed before it can be started. D. A centrifugal pump must be installed below the water surface of the inlet tank. Answer: C. A centrifugal pump can operate in reverse flow as well as in suction mode, but suction operation requires priming before it can start (a self-priming pump is another type of device for priming)