Refining Knowledge (Technology) Daily Question (139) 2.22

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This post was last edited by Shuichangshou on 2010-2-22 at 14:02. Happy New Year to everyone! Another Daily Question is here! We welcome everyone to actively participate in the learning and discussion of professional basic knowledge in the refinery processing technology exchange area! In accordance with the forum’s unified requirements, the maximum score for this activity is 10 Wealth points, and rating charm is prohibited. Friendships and duplicate ratings are also declined. Please be cautious when posting; edits will not be valid! Those who have different opinions on the provided answer keys can post discussions the next day, and those who provide solutions or their own opinions regarding the daily question’s answer key will receive appropriate rewards! The focus is on participation, and there are prizes for participating! To prevent some members from copying other members’ answers, please hide your posts when answering questions. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 I. Multiple-choice questions: 1. Regarding the impact of a high reflux ratio on the operation of a distillation column, which statement is incorrect? A. High tower load B. Reduced separation efficiency C. High operating costs D. Increased mass transfer driving force 2. In a steady-flow system, water flows continuously from the larger tubes into the smaller tubes. If the inner diameter of the thick tube is twice that of the thin tube, then the flow velocity of water in the thin tube is ( ) times that in the thick tube. A、2 B、4 C、6 D、8 3、When the relative molecular masses are similar, （ ） has the highest heat of vaporization. A. Normal alkanes B. Isomeric alkanes C. Cycloalkanes D. Aromatic hydrocarbons 4. In petroleum, trace elements are mainly concentrated in the ( ) fraction. A. Gasoline B. Kerosene C. Diesel D. Residue 5. The stripping process is ( ). A. The mass transfer direction is opposite to that of absorption. B. The solute is transferred from the gas phase to the liquid phase. C. Increase the partial pressure of the solute in the gas phase. D. Decrease the equilibrium partial pressure of the solution. II. True or False: 6. During backwashing of the distillation electrodialysis tank, the primary and secondary electrodialysis tanks can be operated simultaneously. （ ） 7. The pressure drop in a packed tower is lower than that in a plate tower, so it is more suitable for vacuum operations. （ ） 8. Severe water content in crude oil can cause an increase in the current in the electrodialysis desalination unit. （ ） 9. When heating the furnace, a medium must be filled inside the furnace tubes. ( ) 10. At the outlet of the vacuum furnace, several furnace tubes are usually enlarged in diameter in order to reduce the outlet temperature. ( ) Reference answer: BBDDA ×√√√√