Refining Knowledge (Technology) Daily Question (108) 1.12

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We welcome everyone to actively participate in the learning and discussion of professional basic knowledge in the refining technology exchange area! In accordance with the forum’s uniform requirements, the maximum score for this activity is 10 Wealth points, and rating charm is prohibited. Friendship requests and duplicate ratings are also declined. Please be cautious when posting; edits will not be valid! Those who have different opinions on the provided answers can post discussions the next day, and those who provide solutions or their own opinions 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: Daily questions on refining knowledge (technology) are being urgently sought; question creators can be found at: http://bbs.hcbbs.com/thread-553526-1-1.html We hope that participants will take an active role in answering these questions! I. Multiple-choice questions 1. When purging a pipeline equipped with a control valve, the control valve should first be （ ）purged. A. Close the upstream and downstream valves and switch to the bypass line. B. Set the air shut-off valve pressure to zero. C. Set the air open valve pressure to zero, and set the air shut-off valve pressure to the maximum value. D. Increase the air pressure to its maximum level. 2. After the vacuum furnace has been scorched, what should be done inside the furnace tubes? A. First introduce steam, and then switch to air. B. First introduce steam, and then add air. C. First introduce air, and then switch to steam. D. Only introduce steam. 3. During normal operation, which of the following situations can indicate an interruption in the feeding of material into the vacuum furnace? A. The liquid level in the vacuum tower drops. B. The feed to various sections of the vacuum furnace is interrupted. C. Black oil is produced at the atmospheric pressure side outlet. D. The temperature at the exit of the vacuum furnace and at its various branches increases. 4. The smaller the catalyst particles, the easier it is for them to ( ). A. Charring B. Accelerating the reaction C. Cycling D. Entrapment 5. Oxygen respirators belong to ( ). A. Isolated gas mask B. Filtering gas mask C. Long-tube gas mask D. Composite dust mask. II. True or False questions. 6. During shutdown, after the distillation system has been purged, open the vent at the top of the distillation tower and supply steam to each steam supply point; keep the tower operating for 24 hours. （ ） 7. The density of the fluid being transported is independent of the pump’s head, shaft power, and efficiency. ( ) 8. When the reaction temperature is too low, the liquid level at the bottom of the distillation tower will rise sharply. ( ) 9. A failure in the counter-rotation control of the compressor can cause significant fluctuations in the reaction and distillation systems. ( ) 10. The sensitivity of a gauge refers to its ability to reflect the degree of change in the parameter being measured. ( )