09-11-10** Question—Multiple-choice—(Prize for participation)

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This post was last edited by jia717 on 2009-11-9 at 21:04. Multiple-choice questions: 1. The hardness of the heat exchange tube material used for expansion joint connections should ___ the hardness of the tube sheet. A. Be higher than B. Be lower than C. Be equal to D. Be higher than or equal to 2. For the heat exchange tubes after butt welding, each tube should undergo a hydraulic test, with the test pressure being ____ of the design pressure. A. 1.25 times B. 1.5 times C. 2 times D. 2.5 times 3. According to GB150-1998, when the thickness of 16MnR steel plates used for pressure vessel shells exceeds ___, ultrasonic testing of each plate is required. A.20mm B.25mm* C.30mm D.35mm This question was provided by member Qian Tuku Ke Bu; please keep an eye on the person who provided it. 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 on Heat Exchange Zone Technology”, with the link: http://bbs.hcbbs.com/thread-526242-1-1.html. Note: 1. For fill-in-the-blank, multiple-choice, and true/false questions, please reply in 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 hidden formatting or revise their replies will not receive any rewards. We ask for your cooperation. 2. For multiple accounts under the same IP responding to participate, only the first response is valid.