★Specialized Examination for Chemical Engineering ★ — One question per day (2015-11-20) — Points are awarded for participation
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This post was last edited by zshiwei2008 on 2015-11-24 08:26. 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. Daily Question (2015-11-20): 1. What can the head value in meters indicated on a centrifugal pump’s nameplate be understood as? A. The height to which the pump can lift water at 20°C at its specified speed. B. The height to which the pump can lift water at 20°C at its specified speed and under conditions of maximum efficiency. C. The head that the pump can provide for water at 20°C at its specified speed. D. The head that the pump can provide for water at 20°C at its specified speed and under conditions of maximum efficiency. 2. Which of the following blowers belongs to the positive-displacement type? A Centrifugal blower B Roots blower C Both D Neither Reference answer: Question 1: D See the basic definition of head. Question 2: B
1. D 2. D, is there an issue with the answer to question 2? Centrifugal blowers belong to the dynamic (blade-type) category, while Roots blowers are of the positive-displacement type (positive-volume, rotary type). I missed one question yesterday, so I came a bit later today on purpose. Are there any questions for the weekend?
Hey... thanks to the moderator for coming up with the question! I come to check in every day; over time, I keep growing. Additionally, it is suggested whether it would be possible to cancel “Only author visible” on the second day” ； Personally, I think analyzing \"mistakes\" is more helpful for mastering certain things than analyzing \"correct answers,\" and granting access facilitates discussion among everyone
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This post was last edited by chengzi2703 on 2015-11-20 22:59. The file size was too large, so the original poster deleted it~
What can the head value in meters indicated on a centrifugal pump’s nameplate be understood as? B The height to which this pump can lift water at 20°C at its specified speed and maximum efficiency. 2. Which of the following blowers is of the positive displacement type? B Roots blower