【Test Your Knowledge】Basic Chemical Engineering Knowledge (226) Please hide your replies

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This post was last edited by zhangyong6404 on 2009-10-31 23:01. In accordance with the forum’s rules, the maximum score for this activity is 15 Wealth points; giving scores based on charm is prohibited. Friendships and duplicate ratings are also declined. To encourage active participation from members, full marks are given for all correct answers, while 10–12 wealth points are deducted for each incorrect answer. 2 mistakes result in 8–10 wealth points, while points of 4–6 wealth are given as encouragement for participation. Basic Chemistry Section: 1. Among the following compounds, which one belongs to hydrocarbons? ( ) A C4H10 B CH3CH2OH C CH3CHO D 6H5Cl 2. Which of the following is a renewable fuel? ( ) A Coal B Oil C Firewood D Natural gas 3. At present, the main source of ethylene in industry is ( ). A. Ethanol dehydration B. Acetylene hydrogenation C. Petroleum cracking D. Coal distillation. 4. What are the two modifications that the van der Waals equation makes to the ideal gas equation? ( ) A Temperature correction, pressure correction. B There are forces between molecules, and molecules have volume. C Molecules are not spherical, and collisions between molecules follow certain patterns. D There are forces between molecules, along with temperature correction. 5. The concept of activation energy in chemical reactions is ( ). A. The heat of reaction for an elementary reaction; B. The energy that must be absorbed in a general reaction or molecular reaction; C. The heat of reaction for a general reaction; D. The energy that must be absorbed in an elementary reaction or molecular reaction. Part on principles of chemical engineering: 6. What causes gas entrapment in centrifugal pumps? ( ) A. The installation height is too high. B. The pump is unable to draw water. C. The resistance in the inlet pipeline is too high. D. The average density of the fluid inside the pump is too low. 7. Compare the energy consumption of the following three flow regulation methods for centrifugal pumps: ① Valve regulation (throttling method) ； ②Bypass adjustment ； ③Change the speed of the pump impeller or cut the impeller ( ). A ①>②>③ B ②>①>③ C ②>③>① D ①>③>② 8. When two centrifugal pumps of the same specifications are connected in parallel, it can only be said that ( ). A. The flow rate at the new operating point is twice that at the original operating point. B. When the head is the same, the flow rate on the characteristic curve of parallel pumps is twice the flow rate on the characteristic curve of a single pump. C. Parallel pumps operating in a pipeline have a flow rate that is twice that of a single pump. D. Parallel pumps operating in a pipeline have the same head as a single pump, but their flow rate is twice as high. 9. What is the function of the guide vane inside a centrifugal pump? ( ) A Increase the rotational speed B Change the direction of rotation of the impeller C Transform the form of energy D Sealing 10. When the operating flow rate of a centrifugal compressor is less than the specified minimum flow rate, the ( ) phenomenon may occur. A Air lock B Cavitation C Surge D Air entrapment. Reference answers: ACCBD; DBBCC. No score will be given if not hidden by principle. Thank you all! To hide the method, click here: Hide Method. Answer using the same IP; only the first post is valid. Also, be careful when posting – edits are invalid! To encourage independent thinking, those who answer all questions correctly are invited to go to the dedicated award collection post in [Test Your Knowledge] to claim their prizes (click the link)!