★Specialized Examination for Chemical Engineering ★ — One question per day (2016-1-7) — Points are awarded for participation
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Points system for the daily question: Participation – 1~3 points; Correct answer – 5 points; In-depth analysis – 5~10 points. The answer is provided the next day. Due to limited capabilities, I am unable to provide more in-depth explanations for each question; therefore, on the second day, in addition to offering reference options, I will also remove the restriction on reading responses. I hope that all candidates can learn from one another and improve together! Daily Question (2016-1-7): 1. Regarding the parallel or series operation of multiple centrifugal pumps, which of the following statements are incorrect? A. When two identical pumps are connected in parallel, the flow rate in the parallel circuit increases. B. When two identical pumps are connected in series, the flow rate remains unchanged while the final head increases. C. Depending on the required head, two or more pumps can be used in series. D. The more centrifugal pumps that are connected in series, the greater the increase in flow rate. Answer: D
D. The more centrifugal pumps are connected in series, the greater the increase in flow rate. Is it a multi-stage pump?
1. Regarding the parallel or series operation of multiple centrifugal pumps, which of the following statements are incorrect? (D) A. When two identical pumps are connected in parallel, the flow rate in the parallel circuit increases. B. When two identical pumps are connected in series, the flow rate remains unchanged while the final head increases. C. Depending on the required head, two or more pumps can be used in series. D. The more centrifugal pumps that are connected in series, the greater the increase in flow rate
Regarding the parallel or series operation of multiple centrifugal pumps, which of the following statements are incorrect? B. When two identical pumps are connected in series, the flow rate remains unchanged while the final head increases. D. The more centrifugal pumps that are connected in series, the greater the increase in flow rate
B. When two identical pumps are connected in series, the flow rate remains unchanged while the final head increases. The operating point of the pumps is at the intersection of the resulting performance curve and the pressure loss curve of the pipeline; when connected in series, the flow rate in the main pipeline increases
1. Regarding the parallel or series operation of multiple centrifugal pumps, which of the following statements are incorrect? D A. When two identical pumps are connected in parallel, the flow rate in the parallel circuit increases. B. When two identical pumps are connected in series, the flow rate remains unchanged while the final head increases. C. Depending on the required head, two or more pumps can be used in series. D. The more centrifugal pumps that are connected in series, the greater the increase in flow rate
D. The more centrifugal pumps are connected in series, the greater the increase in flow rate.