One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； July 7th

2016-07-07View Original

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Single-choice question: The volumetric efficiency of a pump refers to the ratio of the fluid actually delivered to the fluid that could be delivered in an ideal situation with no leaks. One of the reasons why the volumetric efficiency of a centrifugal pump decreases after it has been operating for some time is __（）___. A. Increased gap ； B. Increased vibration ； C. Increased resistance ； D. Cavitation increases. Answer: A. The gap increases ；

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One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； July 7th

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