【Daily Question: Pump Equipment】True or False Question, 2019.6.11

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This post was last edited by 3983596_FPPZ on 2019-6-11 07:47. Rules for answering questions and managing the post: 1. If all answers to a question are incorrect, participants who engage actively will be rewarded with 2 Wealth points; replies that are not answers will not receive any reward； 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 only one management rating ； 5. The answer and explanation will be visible after responding ； 6. The reply reward is valid for 48 hours. Again, awards for academic achievements – come by here every day. 1. The blades of centrifugal pump impellers with narrow flow channels (low specific speed) are cylindrical in shape, not twisted; the main reason for this is the narrow flow channel, as twisted blades do not contribute much to improving efficiency. ( ) 2. The flow area of the impeller channel in a centrifugal pump remains essentially constant from the inlet to the outlet of the blades. ( ) Answer: 1. Incorrect (because the narrow flow channels make it difficult to cast twisted blades, and casting defects are likely to occur) ； 2. Error (gradually increasing)