Mechanical Equipment: 【Daily Question】2011.04.05

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This post was last edited by Black gold on 2011-4-7 06:50. 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 multiple accounts under the same IP responding to participate, only the first response is considered valid. This issue consists of multiple-choice questions; 5 points are awarded for each correct answer, and everyone who participates will receive a reward. In principle, the top 50 respondents who answer within 48 hours will be graded. Please hide your replies; the method for doing this is: http://bbs.hcbbs.com/thread-492556-1-1.html An centrifugal pump is driven by a prime mover that makes the impeller rotate, ( ), thereby imparting energy to the fluid. A. Centrifugal force is generated by the blades on the rotor ； B. The blades on the rotor do work on the fluid ； C. A vacuum is created at the center of the impeller ； D. The fluid in the flow channel is subjected to centrifugal force. Answer: Choose (B)