Refer to the drawing showing two different operating points for the same centrifugal pump operating in the same cooling water system (see figure below).
Operating point A was generated from pump data collected two days ago.
Operating point B was generated from pump data collected today.
Which one of the following would cause the observed difference between operating points A and B?
A. The pump was rotating faster when data was collected for operating point B.
B. The pump was rotating slower when data collected for operating point B.
C. The pump discharge valve was more open when data collected for operating point B.
D. The pump discharge valve was more closed when data collected for operating point B.
Show Answer
Answer: D
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