A centrifugal cooling water pump is operating in an open system with its discharge valve fully open ___

A centrifugal cooling water pump is operating in an open system with its discharge valve fully open.

If the discharge valve is repositioned to 50 percent open, the pumps available net positive suction head (NPSH) will __________; and the pumps required NPSH will __________.

A. remain the same; decrease
B. remain the same; remain the same
C. increase; decrease
D. increase; remain the same

Show Answer

Answer: C

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