★Specialized Examination for Chemical Engineering ★ — One question per day (2015-12-4) — Points are awarded for participation
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This post was last edited by zshiwei2008 on 2015-12-8 08:29. 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 replies. I hope that all candidates can learn from one another and improve together! Daily Question (2015-12-4): 1. In a two-phase flow system with phase change, the flow pattern along the pipe length is ( ). A. Different flow patterns may occur. B. The same flow pattern. C. Unpredictable changes. D. Uncertain. 2. When a centrifugal pump is installed in a specified piping system and the flow operates in the resistance-square region, then the operating point of the pump refers to ( ). A. The intersection point of the pipeline characteristic curve and the pump characteristic curve B. The design point of the pump C. The parameter point corresponding to the pump’s maximum flow rate D. Determined by the flow rate required by the pipeline. Answer key: Question 1: A; Question 2: A. I’ve been quite busy lately and haven’t reviewed the questions in detail, so I’m providing just the original answer keys. Please let me know if you have any objections
In a two-phase flow system with phase transition, the flow pattern along the pipe length is (A). A. Different flow patterns may occur. B. The same flow pattern. C. Unpredictable changes. D. Uncertain. 2. When a centrifugal pump is installed in a specified piping system and the flow operates in the resistance-square region, the operating point of the pump refers to (A). A. The intersection point of the pipeline characteristic curve and the pump characteristic curve B. The design point of the pump C. The parameter point corresponding to the pump’s maximum flow rate D. Determined by the flow rate required by the pipeline
1. In a two-phase flow system with phase change, the flow pattern along the pipe length is (B). 2. When a centrifugal pump is installed in a specified piping system and operates in the resistance-square region, the operating point of the pump refers to (A).
1. In a two-phase flow system with phase transition, the flow pattern along the pipe length is (D). A. Different flow patterns may occur. B. The same flow pattern. C. Unpredictable changes. D. Uncertain. 2. When a centrifugal pump is installed in a specified piping system and the flow operates in the resistance-square region, the operating point of the pump refers to (A). A. The intersection point of the pipeline characteristic curve and the pump characteristic curve B. The design point of the pump C. The parameter point corresponding to the pump’s maximum flow rate D. Determined by the flow rate required by the pipeline
A: The flow pattern is a function of position and may also change over time. A
1. In a two-phase flow system with phase transition, the flow pattern along the pipe length is (A. Different flow patterns may occur).
2. When a centrifugal pump is installed in a specified piping system and operates in the region of resistance squared, the operating point of the pump is (A. the intersection point of the piping characteristic curve and the pump characteristic curve).