Refining Knowledge (Technology) Daily Question (94)12.28

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Everyone is welcome to actively participate in the learning of professional basic knowledge in the Refining and Processing Technology Exchange Area.* and discuss! According to the unified requirements of the forum, the maximum rating for this activity is 10 wealth, and ratings of charm are prohibited. At the same time, friendship and repeated ratings are declined. Please be careful when posting, editing is invalid! Those who have different opinions on the reference answers provided can post for discussion the next day. Appropriate rewards will be given to those who provide answers or personal opinions to the reference answers to the daily questions! The important thing is to participate, and you will get prizes if you participate! In order to prevent some members from plagiarizing 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 P.S.: Oil refining knowledge (technology) daily question urgently solicits questions from friends: http://bbs.hcbbs.com/thread-553526-1-1.html Answerers are expected to actively participate! 1. Single-choice question 1. When cavitation occurs in a centrifugal pump, the phenomena that occur in the pump body are ( ). A Vibration noise B Sudden increase in flow C Sudden increase in lift D Sudden increase in efficiency 2. When carbon accumulation occurs, the correct treatment method is ( ). A. Decrease the main air B. Increase the main air C. Add combustion accelerant D. Unload catalyst 3. Under normal circumstances, when the amount of coke generated is around ( ), catalytic cracking itself can maintain thermal balance. A 10% B 5% C 15 % D 20% 4. The outer surface of the threaded pipe can be expanded to ( ) times that of the light pipe. A． 1.5~2.5 B. 2.2~2.5 C. 2.2~2.7 D. 2.5~2.8 5. When measuring temperature with thermocouples, the purpose of using compensation wires is ( ). A. Extend the thermocouple. B. Keep the reference junction temperature at 0℃. C. Use it as a connecting wire. D. Extend the thermocouple and keep the reference junction temperature at 0℃. 2. True or False question. 6. Using the "water calling method", you can also see that when water appears in the water level meter, it is called a slight water shortage, and the boiler water supply can be increased. ( ) 7. The riser reactor belongs to transport bed fluidization. ( ) 8. Generally speaking, after the heating furnace is turned off, the furnace must be blown with steam. ( ) The temperature measuring element should be installed at an angle of 9.45 degrees. Whether it is a straight pipe section or an elbow, it must be counter-current with the medium. ( ) 10. For a pressure gauge with an accuracy of level 1.5, the allowable error is 1.5% of the scale limit of the gauge. ( )