【Daily Question: Pump Equipment】Fill-in-the-blank question, April 27, 2019

Thread Content

bk12.jpg Rules for fill-in-the-blank questions: 1. If both answers are incorrect, +2 wealth for active participation; if one answer is correct and the other is incorrect, +5 wealth; if both answers are correct, +8 wealth. 2. If only one answer is provided, unless it is clear which question’s answer it is, a correct answer earns +5 wealth points, while an incorrect answer earns +2 wealth points; in all other cases, it is counted as active participation and grants +2 wealth points. 3. Rewards for answers are available once per person only. 4. Each reply allows scoring for only one person. 5. The answer and its explanation will be visible after responding. 6. The reward is valid for 48 hours; no reward will be given if the deadline is passed. The student has won awards again; come by here every day. To measure the vibration levels of a centrifugal pump with a rotational speed of 2950 r/min and a center height of 320 mm, it is first necessary to determine the acceptable criteria for such vibration levels. According to the standard GB10889-89 \"Methods for Measuring and Evaluating Vibration in Pumps\", this type of pump should fall into category ( ) as specified in the standard. If its vibration level is to be classified as Grade B, then its vibration value should not exceed ( ) mm/s. —— Question based on reference materials; Answer: Category III, 4.5 mm/s