Basic Process Knowledge (Multiple Choice) 20180629
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This post was last edited by HP0377 on 2018-6-29 07:10. Basic Process Knowledge (Multiple Choice) 20180629. Which of the following statements is correct? A. Specific speed is a similarity criterion for classifying all pumps. B. Pumps that can operate at high suction vacuums have stronger self-priming capabilities. C. All impeller-type pumps cannot be used as hydraulic pumps. D. Rotary positive-displacement pumps are generally only suitable for use as oil pumps. Hint: Specific speed is the similarity criterion for impeller-type pumps ； A higher allowable suction vacuum level makes it less likely for cavitation to occur during suction, and this is unrelated to the self-priming capacity ； Some rotary positive displacement pumps, such as single-screw pumps and water ring pumps, are not necessarily used as oil pumps.
C. All impeller pumps cannot be used as hydraulic pumps
C. All impeller pumps cannot be used as hydraulic pumps
C. All impeller pumps cannot be used as hydraulic pumps
C. All impeller pumps cannot be used as hydraulic pumps