【Test Your Knowledge】Basic Chemical Engineering Knowledge (190) Please hide your replies

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This post was last edited by zhangyong6404 on 2009-9-14 at 17:13. In accordance with the forum’s guidelines, the maximum score for this activity is 15 Wealth points; giving scores based on charm is prohibited. Friendship requests 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; the rest receive encouragement bonuses of 4–6 wealth points. 1. The relationship between oxygen and ozone is ( ). A. Isotopes ； B. Allotropes ； C. Isomers ； D. The same substance 2. Gas-liquid chromatography; its separation principle is ( ) A. Adsorption equilibrium ； B. Allocation balance ； C. Sub-exchange equilibrium ； D. Osmotic equilibrium 3. Stainless steel achieves corrosion resistance by adding ( ) metal. A. Chromium and molybdenum ； B. Chromium and nickel ； C. Nickel and manganese 4. The characteristic of plug flow is ( ). A. Fresh particles entering the reactor mix instantly with the particles remaining in the reactor ； B. The exit concentration is equal to the inlet concentration ； C. The concentration and temperature of the fluid material are equal at every point on the cross-section perpendicular to the flow direction, and do not change over time ； D. As soon as the material enters the reactor, it spreads evenly throughout the entire reactor. 5. The higher the vacuum level inside the equipment, the greater the absolute pressure inside the equipment ( ). A. becomes ； B. The smaller, the better ； C. The closer to atmospheric pressure ； D. Unable to determine. 6. Among the following fluid transfer machinery, which one requires the installation of pressure stabilization devices and heat removal devices? ( ) A. Centrifugal pump ； B. Reciprocating pump ； C. Reciprocating compressor ； D. Rotary pump 7. When discussing the separation performance of cyclones, the term critical diameter refers to ( ). A. The diameter of the cyclone at which its efficiency is highest ； B、Minimum diameter allowed for the cyclone separator ； C. The diameter of the smallest particles that can be completely separated by the cyclone separator ； D. The maximum particle diameter that can maintain a stagnant flow pattern. 8. For shell-and-tube heat exchangers, when the temperature difference between the shell and the heat exchange tubes is ( ), the resulting temperature differential stress can be destructive; therefore, thermal compensation is necessary. A. Greater than 45℃ ； B, greater than 50℃ ； C、greater than 55℃ ； D. Greater than 60°C 9. What does not affect the number of theoretical plates is the ( ) of the feed. A. Position ； B. Thermal state ； C. Composition ； D. Feed rate: 10. The relationship between the flooding velocity in a countercurrent packed tower and the liquid spray rate is ( ). A. As the spray rate decreases, the flooding velocity also decreases ； B、Irrelevant ； C. Reduced spray volume increases the gas velocity at the splash point ； D. An increase in the spray volume leads to an increase in the gas velocity at the splash point. Answer: BBBCBCCBDC. All members now have access to hidden replies; please cooperate actively. Starting from this issue, no scoring will be given in principle without hiding it. Thank you all! To hide the method, click here: Hide Method. Answers using the same IP are valid only for the first post. 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 reward collection post on [Test Your Knowledge] to claim their prizes (click the link)! 【Test Your Knowledge】Analysis of Answers to Basic Chemical Engineering Knowledge (189) http://bbs.hcbbs.com/viewthread.php?tid=543501&extra=