【Daily Question】Pump Equipment Technical Exchange Edition 20180130

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Correction: In the daily question from 20180129, the term \"one-time frequency\" (also known as the fundamental frequency) refers not to the power frequency. Participants will receive 3 units of wealth as a reward； Correct answer: Reward of 10 wealth points ； Note: A reward of 10 wealth points will be given for correct answers within 48 hours; this post is valid for 48 hours. Multiple-choice question: For a multi-stage centrifugal pump driven by an electric motor, with a driving power of 315 kilowatts and a rotational speed of 2980 revolutions per minute, which of the following measurement methods is most suitable for monitoring the vibration of its bearing housings? A. Vibration displacement B. Vibration velocity C. Vibration acceleration D. Phase Correct answer: B. Vibration can be classified by frequency range: low-frequency vibration (f less than 60,000 revolutions per minute), with acceleration measured in mm/(s^2) as the standard for vibration. https://attach01.hcbbs.com/forum/201801/05/235057wnwxbzxb311ikvvz.jpg.thumb.jpg