\"Plainness is a blessing\" – Moderator’s compilation post of daily questions and images from November 2015

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1. 【Daily Question】11.2 Multiple-choice question: What is the relationship between the flow rate and head of a reciprocating pump? http://bbs.hcbbs.com/thread-1488598-1-1.html 2. 【Daily Question】11.3 True or False: Since hydrogen-handling systems are prone to leaks which are not easily detected, it is necessary to conduct regular inspections of such systems... http://bbs.hcbbs.com/thread-1489341-1-1.html 3. 【Daily Question】True or False: 11.5 The use of variable frequency speed control for pump motors enables energy savings by reducing voltage. http://bbs.hcbbs.com/thread-1490837-1-1.html 4. 【Daily Question】Multiple Choice: 11.6 In a shell-and-tube heat exchanger, if the tube bundle becomes blocked due to leaks within the same tube side, ( ). http://bbs.hcbbs.com/thread-1491608-1-1.html 5. 【Daily Question】Multiple Choice: 11.6 For oil processing, the specified temperature limit for the furnace chamber is ≯ (not more than) ( )°C (Hydrogenation section). http://bbs.hcbbs.com/thread-1491715-1-1.html 6. 【Daily Question】11.9 Multiple Choice: The reason why oils lose their fluidity at low temperatures is: ( ). http://bbs.hcbbs.com/thread-1493206-1-1.html 7. 【Daily Question】11.10 Multiple Choice: Gas analysis must be conducted on towers and vessels before any welding work is carried out; when the total amount of flammable gases is ≯ http://bbs.hcbbs.com/thread-1494018-1-1.html 8. 【Daily Question】11.11 Multiple Choice: Using ( ) in the production process can increase the octane rating of gasoline. http://bbs.hcbbs.com/thread-1494647-1-1.html 9. [Daily Question] 11.11 – Multiple-choice question: The lowest oil temperature at which oil can ignite spontaneously is called ( ). (Hydrogenation section) http://bbs.hcbbs.com/thread-1494808-1-1.html 10. [Daily Question] 11.12 – True or False question: Under normal circumstances, sulfur has a temporary toxic effect on catalysts, depending on the nature of the feed oil. http://bbs.hcbbs.com/thread-1495416-1-1.html 11. [Daily Question] 11.13 – True or False question: An infrared thermometer uses the infrared radiation emitted by an object to measure that object’s temperature. http://bbs.hcbbs.com/thread-1496178-1-1.html 12. [Daily Question] 11.16 – Multiple-choice question: Which of the following does not belong to the category of equilibrium separation mass transfer processes? http://bbs.hcbbs.com/thread-1497685-1-1.html 13. [Daily Question] 11.17 – Multiple-choice question: What is the reflux ratio? http://bbs.hcbbs.com/thread-1498618-1-1.html 14. [Daily Question] 11.18 – True or False question: The preheating rate of a hot oil pump should be ≤ 50°C/h. ( ) http://bbs.hcbbs.com/thread-1499329-1-1.html 15. 【Daily Question】11.19 Multiple-choice question: What is the distillation section? http://bbs.hcbbs.com/thread-1500135-1-1.html 16. 【Daily Image】11.19 What is this inverted trapezoid in the image? http://bbs.hcbbs.com/thread-1500220-1-1.html 17. 【Daily Question】11.23 True or False: Pumps use frequency conversion technology mainly to achieve more precise control. ( ) http://bbs.hcbbs.com/thread-1502539-1-1.html 18. [Picture of the Day] 11.23: What type of pump is shown in the above image? Does anyone know? http://bbs.hcbbs.com/thread-1502555-1-1.html 19、【Daily Question】11.23 True or False: The intensity of the rotten egg smell associated with hydrogen sulfide is directly proportional to its concentration. ( ) (Hydrogenation section) http://bbs.hcbbs.com/thread-1502758-1-1.html 20. [Daily Question] 11.24 – True or False: A sensitive tray means that when the purity of the product at the top of the tower changes, the temperature also changes accordingly. http://bbs.hcbbs.com/thread-1503350-1-1.html 21. [Daily Image] 11.24 – Please guess what devices the two items shown in this image are: ( ) and ( ). http://bbs.hcbbs.com/thread-1503463-1-1.html 22. [Daily Question] 11.25 – Essay question: What are the functions of lubricating oil? (Answer any five of them.) http://bbs.hcbbs.com/thread-1504070-1-1.html 23. 【Picture of the Day】11.25 – Please guess the name and function of the device in this picture http://bbs.hcbbs.com/thread-1504085-1-1.html 24、【Picture of the Day】11.26 What is this device in the picture, and where is it used? http://bbs.hcbbs.com/thread-1505025-1-1.html 25. [Question of the Day] 11.26 – Essay question: What is the content of the five-character operation method? http://bbs.hcbbs.com/thread-1505065-1-1.html 26、【Picture of the Day】11.27 Look at how festive the color of the tank in this picture is; guess what kind of tank it is http://bbs.hcbbs.com/thread-1505701-1-1.html 27. [Daily Question] 11.27 – Multiple-choice question: What are the symptoms that occur when flooding takes place? http://bbs.hcbbs.com/thread-1505980-1-1.html 28. [Daily Question] 11.27 – Multiple-choice question: What is the main cause of leakage? (Hydrogenation section) http://bbs.hcbbs.com/thread-1505988-1-1.html 29. [Daily Question] 11.28 – Multiple-choice question: What type of tray does a tongue-shaped tray belong to? (Hydrogenation section) http://bbs.hcbbs.com/thread-1506001-1-1.html 30. [Daily Image] 11.30 – Identify what device is shown in this image http://bbs.hcbbs.com/thread-1507407-1-1.html 31、【Daily Question】11.30 What instruments are used to measure flow rate in chemical production plants? http://bbs.hcbbs.com/thread-1507466-1-1.html