Power requirement of fans having constant wheel diameter varies _____________ fan speed?
Correct answer: B. As cube of
- A. As square of
- B. As cube of
- C. Directly as
- D. None of these
Explanation
The fan affinity laws state that, at constant wheel diameter, flow varies as N, pressure or head as N², and power as N³. Therefore, fan power rises much faster than speed.
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