Mechanical Equipment [One Question per Day] (Previous event; closed after being handled by the moderator-----Benzhen Xuan)

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This post was last edited by Benbenxuan on 2013-4-9 at 12:10. Please hide your replies; editing after posting is invalid! Those with different views on the provided answer keys can post discussions the next day. For responses from multiple accounts under the same IP, only the first one submitted counts as valid. This is a single-choice question. A score of 5 points is given for answering two questions correctly, 3 points for answering one question correctly, and 2 points for the rest. Please hide your replies; the method for hiding them is: http://bbs.hcbbs.com/thread-492556-1-1.html. Single-choice question: 1. Which of the following situations constitutes a fault within the slurry centrifugal pump itself? ( ) A. Compared to normal operating conditions, the pump’s outlet pressure remains the same or is slightly higher, while the motor current is slightly lower. B. Compared to normal operating conditions, there are significant fluctuations in both the pump’s outlet pressure and current, along with irregular noises and vibrations from the pump. C. Compared to normal daily conditions, both the pump outlet pressure and current are lower and more stable. D. Compared to normal daily conditions, both the pump outlet pressure and current are higher. 2. Which of the following statements about the advantages of using hydraulic couplings in belt conveyors is incorrect? A. Improve the motor’s starting performance B. Provide overload protection C. Reduce the impact on the working mechanism D. Increase the conveyor’s capacity Answer: C D