With a constant diameter impeller of a centrifugal pump _____________________?
Correct answer: A. Head varies as the square of speed
- A. Head varies as the square of speed
- B. Its capacity varies directly as the square of speed
- C. Horsepower input varies as the square of speed
- D. Head varies as the speed
Explanation
With impeller diameter fixed, the pump affinity laws give capacity proportional to N, head proportional to N², and input power proportional to N³. Hence the head varies as the square of speed.
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