Water Distribution Operator Class II Practice Questions - ABC WPI Water Distribution Operator Class II Certification Exam

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A variable frequency drive (VFD) on a centrifugal booster pump is reduced from 60 Hz to 48 Hz. By the affinity laws, what happens to brake horsepower (BHP) demand?

BHP decreases linearly to about 80% of the original BHP decreases to about 64% (the ratio squared) BHP decreases to about 51% (the ratio cubed) BHP is unchanged because the motor still draws nameplate power

Correct Answer:

BHP decreases to about 51% (the ratio cubed)

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