Refining Knowledge (Technology) Daily Question (29) 10.21

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This post was last edited by akzo2008 on 2009-10-21 at 23:59. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the refinery processing technology forum! In accordance with the forum’s unified requirements, the maximum score for this event is 10 Wealth points, and rating charm is prohibited. At the same time, friendship requests and duplicate ratings are declined. Additionally, for answers using the same IP, only the first post is valid. Be careful when posting; editing is ineffective! Those who have different opinions on the provided answer keys can post discussions the next day; 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 Note: Daily questions on refining knowledge (technology) are being urgently sought; those who can create questions can visit: http://bbs.hcbbs.com/thread-553526-1-1.html We hope that participants will take an active role in answering these questions! I. Single-choice questions. 1. The crude oil pump is operating normally, and the control systems before and after dehydration are also functioning properly. However, the reason for the continuous drop in the level of the fractionator is: ( ) A. Condensation in the crude oil line B. Excessive extraction from the third stage C. The safety valve of the electrodesalination tank opening D. An incorrect process flow in the tank area. 2. Which of the following is NOT a factor that can cause flooding in the fractionator? ( ) A. Excessive amount of crude oil being processed B. Excessively high furnace temperature C. Crude oil containing water D. Water being carried in by the steam supplied to the bottom of the tower. 3. Which of the following statements correctly describes the impact of steam temperature on a turbine? ( ) A. If the steam temperature is higher than the designed value, it is acceptable from a safety perspective, but it is not economically advantageous. B. If the steam temperature is lower than the designed value, it increases the reactivity of the blades, thereby increasing the axial thrust. C. Operating at an excessively low steam temperature reduces steam consumption and improves economic efficiency. D. Lowering the steam temperature has no significant effect on the turbine. 4. Which of the following statements is correct regarding the mechanical lubrication film? ______ A. When the viscosity of the lubricating oil is the same, the faster the shaft rotates, the thicker the oil film becomes. B. At the same rotational speed, the higher the viscosity of the lubricating oil, the thinner the oil film becomes. C. As the load on the equipment increases, the thickness of the lubrication oil film increases. D. All of the above statements are correct. 5. Which of the following statements correctly describes the principles for determining the media to be used in the shell and tube sides of a heat exchanger? ______ A. Clean fluids should be used in the shell side, as this facilitates cleaning and maintains high flow rates. B. Using corrosive fluids in the tube side can reduce costs and facilitate maintenance. C. Fluids with low flow rates or low heat transfer coefficients flow in the shell side; the low flow velocity helps to improve the heat transfer efficiency. D. Saturated steam flows in the tube side, facilitating the removal of condensate. II. True or False questions. 6. The top temperature of the oil distillation column can be approximated as the bubble point temperature of the product at the top of the column, under the vapor pressure of the gas at that level. （ ） 7. As the delivery pressure increases, the operating characteristic curve of the gear pump is no longer a straight line. ( ) 8. The method for compensating the cold end of a thermocouple is to use a compensation wire to extend the cold end of the thermocouple to a location where the temperature is the same as that outside. ( ) 9. In the anti-reverse system, the selection principles for the density measurement points must all be in the same direction along the axial direction of the fluidized bed, and there is no restriction on the distance between the two measurement points. ( ) 10. The computing unit of pneumatic or electric combination instruments can perform operations such as addition, subtraction, multiplication, division, and square root, in order to work in conjunction with the actuation units. ( ) Multiple-choice and true/false questions, 10 questions per day; 1 wealth point for each correct answer. Note: The answers will be released at least 16 hours later, and scoring will be given after the answers are made available; no further scoring will be conducted for those who respond after the answers have been released. Reference answer: CBBAB Wrong Right Wrong Wrong Wrong