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Among the following fluid transport machinery, the type in which it is appropriate to adjust the flow rate by changing the opening degree of the outlet valve is (C). A. Gear pump B. Vortex pump C. Centrifugal pump D. Reciprocating pump. The correct answer for this question is the reciprocating pump; I remember that the flow rate of a reciprocating pump can be adjusted by controlling its stroke length
For this question, the answer is the centrifugal pump. You must have made a mistake
Positive displacement pumps should not be used to regulate flow rate by adjusting the outlet!
For centrifugal pumps, isn’t the answer correct?
Only speed-type pumps are suitable for outlet throttling control~~~~~~~~