【Daily Question】Multiple-choice Question 2019.5.11
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The last edit to this post was made by 3983596_FPPZ on 2019-5-11 at 15:23. Rules for answering questions and managing the post: 1. If all answers to a question are incorrect, participants will receive a reward of 2 wealth points； 2. In the answer section, a correct answer earns 5 wealth points ； A reward of 8 wealth for all correct answers ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for one management rating only ； 5. The answer and explanation will be visible after responding ； 6. The reply reward is valid for 48 hours. Studying* and winning awards again; come by here every day. 1. For rotating mechanical equipment, it is often necessary to turn the shaft before starting it or when it has not been in use for some time. Which of the following statements regarding the appropriate angle for turning the shaft is correct? ( ) ； A 360°n B 180°n C 180°(2n+1) D 360°(2n+1) E Any angle. 2. In a BB4 multi-stage pump (segmented multi-stage pump), if the number of impeller blades is 6, then the appropriate number of blades on the guide vanes located on the outside of the impeller is （ ）. A 3 pieces B 6 pieces C 7 pieces D 12 pieces Answer: 1, C (to achieve a flipped state, i.e., an odd multiple of 180°) ； 2. C (the two numbers of blades should be coprime to avoid vibrations resulting therefrom)
1. For rotating mechanical equipment, before starting up or when it is not in use for a period of time, it is often necessary to turn the shaft. Regarding the angle at which this rotation should be carried out, the principle that is correct is (B)； A 360°n B 180°n C 180°(2n+1) D 360°(2n+1) E Any angle. 2. In a BB4 multi-stage pump (segmented multi-stage pump), if the number of impeller blades is 6, then the appropriate number of blades on the guide vanes located on the outside of the impeller is (C). A 3 pieces B 6 pieces C 7 pieces D 12 pieces