【Test Your Knowledge】Basic Chemical Engineering Knowledge (161) Please hide your replies

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This post was last edited by wbp on 2009-8-16 at 13:01. In accordance with the forum’s guidelines, the maximum score for this activity is 15 Wealth points; giving scores based on charm is prohibited. At the same time, friendship requests and repeated ratings are declined. To encourage active participation from members, the top 5 correct answers receive a full score; for the remaining answers, 10–15 wealth points are awarded for every correct answer, while 8–12 wealth points are given for each incorrect answer. 2 mistakes result in a loss of 6–10 wealth points; the remaining mistakes earn bonus points of 2–6 wealth points as an incentive for participation. In a distillation column, when the number of plates and other process conditions remain constant, increasing the reflux ratio will improve the quality of the product. A. Irregular changes B. Remains unchanged C. Decreases D. Increases. 2. What abnormal phenomenon occurs when there is insufficient rising steam in a distillation tower? A. Flood flow B. Leakage C. Mist entrainment D. Dry plate 3. Among the following tower equipment, which one has the smallest operating flexibility? A. Tray tower B. Floating valve tower C. Bubble column tower D. Tongue-and-groove tray tower 4. In binary continuous distillation operations, changes in the feed heat condition parameter q will cause changes in （ ）。 A. Equilibrium lines and diagonal lines B. Equilibrium lines and feed lines C. Operating line of the distillation section and equilibrium lines D. Operating line of the stripping section and feed lines 5. The operating line of distillation is linear mainly because ( ). A. Theoretical plate assumption ； B. Ideal system ； C. Bubble point reflux at the tower top ； D. Hypothesis of constant molar flow. 6 The number of theoretical plates NT required to accomplish the separation task using a distillation column is 8 (including the reboiler); if the overall column efficiency ET is 50%, then the actual number of plates in the column is ( ). A. 16 floors B. 12 floors C. 14 floors D. Unable to determine. Which of the following statements is correct regarding distillation operations? A. The most direct and effective way to adjust the temperature at the top of the distillation tower is by adjusting the reflux rate. B. Once the pressure and temperature in the distillation tower meet the process requirements, the product at the top of the tower can be collected. C. Only when the pressure and temperature in the distillation tower meet the process requirements can the material at the bottom of the tower be extracted. D. When the pressure and temperature in the distillation tower meet the process requirements, the reflux valve must be closed, and all the liquid in the reflux tank should be collected as product. 8. In the operation of a distillation tower, if the temperature and pressure at the bottom of the tower become unstable, what measures can be taken? A. Adjust the steam pressure to a stable level. C. Check the drain valve. B. Shut down the system to locate the leak. D. All of the above three methods. 9. In a packed tower with counter-current absorption, when the absorption factor A