【Test Your Knowledge】Basic Chemical Engineering Knowledge (162) Please hide your replies

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This post was last edited by wbp on 2009-8-17 at 15:28. In accordance with the forum’s guidelines, 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, 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. 1 According to the double-membrane theory, at the gas-liquid interface ( ). A. The gas phase composition is greater than the liquid phase composition ； B. The gas phase composition is lower than that of the liquid phase ； C. The gas phase composition is equal to the liquid phase composition ； D. Equilibrium between gas phase composition and liquid phase composition. 2 When using air as a medium to dry heat-sensitive materials and the drying process is in its deceleration stage, the most effective measure to shorten the drying time is ( ). A. Increase the temperature of the medium. B. Increase the drying area and reduce the thickness of the material. C. Decrease the relative humidity of the medium. D. Increase the flow rate of the medium. 3. For drying small batches of material in which the crystals are prone to breaking due to friction, but it is still necessary to maintain a good crystal structure, which type of dryer should be used? (　) A、Box dryer ； B. Drum dryer ； C. Air flow dryer ； D. In the internal diffusion control stage of the fluidized bed dryer 4, the main factors affecting the drying rate are (　). A. Properties of air B. Structure, shape, and size of the material C. Moisture content on a dry basis D. Moisture content on a wet basis 5. During the crystallization process, a higher degree of supersaturation can ( ) the crystals. A. A small amount is obtained, with a large volume. B. A large amount is obtained, with a small volume. C. A large amount is obtained, with a large volume. D. A small amount is obtained, with a small volume. 6. The main way to increase the production capacity of an evaporator is to increase: A. The temperature difference for heat transfer ； B. Heating steam pressure ； C. Heat transfer coefficient ； D. Heat transfer area 7. The primary factor to consider when selecting an extractant is ( ). A. The ease of recovering the extractant B. The price of the extractant C. The selectivity of the extractant’s solvating capacity D. The stability of the extractant 8. The technical document that enables the organization, implementation, and supervision of production is ( ). A. Equipment layout diagram B. Material flow diagram C. Piping layout diagram D. Process flow diagram with control points. 9 The components of a process flow diagram with control points include ( ). A. Equipment, pipelines, instruments, valves, diagrams, and title bars B. Plant buildings C. Equipment and plant buildings D. Block flow diagram 10. Which of the following is an incorrect way of using a burette? A. It should be cleaned before use, and checked for leaks ； B. Ensure there are no bubbles in the tip portion before titration ； C. When higher accuracy is required, volume correction must be performed ； D. To ensure that the concentration of the standard solution remains constant, it can be heated and dried before use. All members already 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! Also, be careful when posting – edits are invalid! To hide the method, click here: Hide Method. Answers for Issue 162: dbabb ccdad