Discussion
A fan absorbing 100 kW at full speed and running at 70 per cent speed for much of the year absorbs about
Answer: D
Correct answer: 34 kW at that reduced speed
\[ 100 \times 0.7^3 = 100 \times 0.343 = 34.3\ \mathrm{kW}. \] A thirty per cent reduction in speed removes two thirds of the power. Over a year of running the saving pays for a converter drive many times over, which is why fan and pump applications dominate the variable-speed market.
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