【Daily Question: Pump Equipment】True or False Question, 2018.12.18

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bk03.jpg Rules for multiple-choice questions: 1. A reward of 2 Wealth is given for actively attempting both questions despite getting them wrong; 4 Wealth is awarded for getting one question right and the other wrong; 6 Wealth is given for answering both questions correctly ； 2. Rewards for answers are available once per person only ； 3. Each reply allows for one management rating only ； 4. The answer and its explanation will be visible after responding ； 5. The reward is valid for 48 hours. Studying* and winning awards again; come by here every day. 1. If the outlet valve of a centrifugal pump is gradually opened from fully closed to its maximum position, then at certain points the flow rate can be zero, the efficiency can be zero, and the net positive suction head can also be zero. ( ) 2. Based on the variation pattern of the pump’s flow-rate versus shaft power curve, it can be determined whether the pump should be started with the valve closed or with the valve open. ( ) Answer: Incorrect, Correct