One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； June 10
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Multiple-choice question: During the operation of a centrifugal pump, which of the following statements are correct? ( ) A. When starting the centrifugal pump, to prevent the motor from being overloaded, the outlet valve should not be fully opened. B. The inlet valve should be fully open so that the pump chamber is filled with liquid, thereby avoiding wear on components such as the seal rings and shaft seals. C. During operation, the desired flow rate and head within the performance range of the centrifugal pump can be achieved by adjusting the opening degree of the outlet valve. D. After stopping the centrifugal pump, the outlet valve should be closed first to prevent fluid from flowing back and causing the impeller to rotate in the reverse direction. Answers: ABCD
A. When starting a centrifugal pump, to prevent the motor from being overloaded, the outlet valve should not be opened fully. B. The inlet valve should be opened fully so that the pump chamber is filled with liquid (this helps to avoid wear on components such as seal rings and shaft seals). C. During operation, the desired flow rate and head within the performance range of the centrifugal pump can be achieved by adjusting the opening degree of the outlet valve. D. After stopping the centrifugal pump, the outlet valve should be closed first to prevent fluid from flowing back and causing the impeller to rotate in the opposite direction