Piping and Valves Knowledge: [Question of the Day] 2011-01-30
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This post was last edited by security on 2011-1-31 11:12. Multiple-choice question: When the piping system is finally connected to the machine, a dial indicator should be installed on the coupling to monitor the machine’s displacement. When the rotational speed is less than or equal to 5000 r/min, its displacement value should be less than () ； When the rotational speed is 8000 r/min or higher, its displacement value should be less than ( ) A. 0.02mm B. 0.03mm C. 0.04mm D. 0.05mm 1) All participants will receive a reward (usually 5 points for correct answers, 3 points for incorrect ones, 1 point for those who do not hide their answers; additional points may be given to those who provide detailed discussions) ； 2) Please hide your replies; the method to do this is: http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit the replies after posting them. 3) This question will be closed the next day or when a new daily question is released. 4) The answers are D and A; refer to GB 50235. Here, I deliberately changed the rotational speed, but it still holds true
This post was last edited by security on 2011-1-30 09:51. When the piping system is finally connected to the machine, a dial indicator should be installed on the coupling to monitor the machine’s displacement. When the rotational speed is less than or equal to 5000 r/min, its displacement value should be less than (D) ； When the rotational speed is 8000 r/min or higher, its displacement value should be less than (A) ； A、0.02mm B、0.03mm C、0.04mm D、0.05mm
D、0.05mm； A、0.02mm