Refining Knowledge (Technology) Daily Question (157) 3.12

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This post was last edited by chengkang on 2010-3-12 07:09. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the Refining 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. Friendship requests and duplicate ratings are also 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 it! To prevent some members from copying the answers of other members, 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. What is the function of the inlet guide cone of the smoke extractor? ( ). A. Ensure that the flue gas enters the guide vanes in a symmetrical and even manner. B. Reduce the resistance of the flue gas. C. Lower the catalyst concentration. D. Increase the flow velocity of the flue gas. 2. When a turbine experiences a sudden load loss, the axial thrust will ( ). A. Instantly change direction B. Return to zero C. Suddenly increase D. Remain unchanged 3. When the main fan experiences surge, the component most likely to be damaged is ( ). A. Bearing B. Seal C. Blade D. Diaphragm 4. Centrifugal compressors and turbines generally use （ ） bearings, as these bearings are suitable for reliable operation under （ ） conditions. A. Rolling, high speed under heavy load B. Sliding, high speed under light load C. Rolling, low speed under light load D. Sliding, high speed under heavy load 5. The actual head of a pump is unrelated to ( ). A. Impeller diameter B. Pump speed C. Pump flow rate D. Rated power of the motor II. True or False questions 6. The main purpose of injecting steam into the process heating furnaces in coking units is to increase the flow rate and prevent coking of the furnace tubes. ( ) 7. To prevent explosions and fires caused by the accumulation of flammable gases, areas where flammable liquids are stored and used must have good air circulation. （ ） 8. At the same flow rate, the oil transfer capacity of a 200mm pipeline is equivalent to that of two 100mm pipelines. （ ） 9. The freezing point of oils is related to their chemical composition; generally, the freezing point of n-alkanes decreases as the chain length increases. ( ) 10. The bed layer, density, and volume of the reverse regeneration system can be measured using a backblowing system because this bed layer is in a suspended state and possesses properties similar to those of a fluid. ( ) Reference answer: A A B D D √ √ × √ √