Refining Knowledge (Technology) Daily Question (86) 12.20

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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. At the same time, friendship requests and duplicate ratings are declined. Please be cautious when posting; edits will not be effective! Those who have different opinions on the provided answers can post discussions the next day, and those who provide solutions or their own views regarding the daily question 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 H9 Q8 x: O/ {9 e: F Note: Urgent call for contributors to provide a daily question on refinery knowledge (technology). Thread address: http://bbs.hcbbs.com/thread-553526-1-1.html We look forward to active participation from those who are willing to answer the questions! I. Multiple-choice questions 1. The density of jet fuel is usually required to be controlled at 775 Kg/m3 ( ). A. Above B. Below C. Considerable D. Near 2. In the electrical desalination of crude oil, desalination is primarily achieved through: ( ) A. Electric field B. Addition of demulsifiers C. Maintaining the appropriate temperature D. Injection of water 3. Among the following metals, which one has the best effect on reducing hydrogen production in passivated nickel? ______: A. Sb B. Ti C. Bi D. Sn 4. Which of the following is not a differential pressure flow meter? ( ) A. Venturi tube B. Target flow meter C. Circular nozzle D. Eccentric sharp orifice plate 5. Which one is used for safety valves in corrosive media? A. With radiators and without radiators B. With a bellows and without a bellows C. With a wrench and without a wrench D. Enclosed and unenclosed II. True or False questions. 6. If the dry point of the catalyzed crude gasoline is high, then the light diesel fraction is carried upward, and as a result, the initial boiling point of the light diesel will also be high. ( ) 7. During the shutdown of the unit, when the outlet temperature of the atmospheric pressure furnace drops to 250°C and that of the reduced pressure furnace drops to 300°C, the heating furnace begins to shut down. ( ) 8. The installation of the blind flange for switching the catalytic unit to the oil bypass line should be carried out at least 24 hours after the feed supply is cut off. （ ） 9. Steel plates are the best material for making blind flanges; alternatives such as asbestos boards or tinplate can also be used. A handle should be provided during fabrication, and the thickness of the blind flange should be less than that of the pipe wall. ( ) 10. For those who have suffered poisoning or asphyxiation due to toxic and harmful gases, it is necessary to send the patient to the hospital as quickly as possible, while still ensuring proper first aid is provided. ( )