【Daily Question: Pump Equipment】Fill-in-the-blank question, May 24, 2019

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This post was last edited by 3983596_FPPZ on 2019-5-24 09:37. Rules for answering questions and managing the post: 1. If all answers to a question are incorrect, participants will receive a reward of 2 wealth points； 2. In the answer section, a correct answer earns 5 wealth points ； A reward of 8 wealth for all correct answers ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for one management rating only ； 5. The answer and explanation will be visible after responding ； 6. The reply reward is valid for 48 hours. Studying* and winning awards again; come by here every day. 1. Given that the grid frequency is 50 Hz, the motor has 4 poles, and its slip rate is 2.8%, what is the motor’s speed at this time in r/min? ； 2. The diameter of the pump inlet pipe is DN100, and the flow rate is 80 m3/h; therefore, the average flow velocity of the fluid in the inlet pipe is ( ) m/s. Answer: 1. 50x60/2=1500, 1500x(1-2.8%)=1458 ； 2, 4x80/(36x3.14159)=2.83