One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； August 22nd
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Multiple-choice question: In the combined operation of centrifugal pumps, when two centrifugal pumps of the same model operate in parallel and each has the same suction pipeline, compared to the characteristic curve of a single pump, the correct change in the characteristic curve of the parallel pumps is ( ). A. The horizontal axis of the curve remains unchanged, and the vertical axis also remains unchanged. B. The horizontal axis of the curve remains unchanged, but the vertical axis doubles. C. Both the horizontal axis and the vertical axis of the curve double. D. The horizontal axis of the curve doubles, while the vertical axis remains unchanged. Answer: D, The horizontal axis of the curve doubles, while the vertical axis remains unchanged
In the combined operation of centrifugal pumps, two centrifugal pumps of the same model operate in parallel, and they share the same suction piping. Compared to the characteristic curve of a single pump, the correct change in the characteristic curve of the pumps operating in parallel is (B). A) The horizontal axis of the curve remains unchanged, and the vertical axis also remains unchanged. B) The horizontal axis of the curve remains unchanged, but the vertical axis doubles. C) Both the horizontal axis and the vertical axis of the curve double. D) The horizontal axis doubles, but the vertical axis remains unchanged
D. The horizontal coordinate of the curve is doubled, while the vertical coordinate remains unchanged
D. The horizontal coordinate of the curve is doubled, while the vertical coordinate remains unchanged
B. The horizontal coordinate of the curve remains unchanged, while the vertical coordinate is doubled
D. The horizontal coordinate of the curve is doubled, while the vertical coordinate remains unchanged