09-10-21**Question—Multiple-choice—(Prize for participation)

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This post was last edited by jia717 on 2009-10-22 21:53. Multiple-choice questions (one or more of the following answers are correct): 1. Which of the following ______ belongs to the fin types used in plate-fin heat exchangers? a. Straight type ； b. Wavy type ； c. Serrated type ； d. Porous type 2. According to GB151-1999 \"Shell and Tube Heat Exchangers\", determine which of the following statements are incorrect? ________ a. For the connection of heat exchange tubes with an outer diameter of less than 14 mm to the tube sheet, expansion jointing shall not be used. b. Rod-spacing rod structure, suitable for tube bundles with an outer diameter of heat exchange tubes less than 19 mm. c. A spot-welded structure of tie rods and baffle plates, suitable for tube bundles with a heat exchange tube inner diameter greater than 14 mm. d. Minimum thickness of the impact plate: 3.5 mm for carbon steel, and 3 mm for stainless steel. 3. GB151-1999 \"Shell and Tube Heat Exchangers\" stipulates that the minimum distance from the surface of the outermost heat exchange tubes in a fixed-tube-sheet or U-tube heat exchanger to the inner wall of the shell is generally not less than ______ mm. a. 5 ； b. 6 ； c. 8 ； d. 10 questions* These questions were provided by member luhongtai; the provider should keep an eye on them. The purpose of this* topic is to help everyone review some basic theoretical knowledge, gain new insights by reviewing what has been learned before, discuss and gain a deeper understanding of standards or specifications, as well as address specific issues encountered in practice. This enables us to learn together and improve together; we welcome all friends to participate actively. If you have good *questions, you can also provide them to us; we will offer certain rewards to those who provide them. For more details, please refer to the top post in the heat exchange section titled “Special Thread for Collecting Questions and Answers Related to Heat Exchange Technology”. The link is: http://bbs.hcbbs.com/thread-526242-1-1.html. Note: 1. For fill-in-the-blank, multiple-choice, true/false, and essay questions, please reply using the hidden format (for specific methods of hiding replies, see http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8). Rewards will be given to those who reply correctly; those who do not use the hidden format or revise their replies will not receive any rewards. Please cooperate actively. 2. For multiple accounts under the same IP address, only the first response that participates is valid. Reference answers: 1.abcd 2.abcd 3.c