Discussion
A precipitator passes \( 0.4 \) per cent of the inlet dust. Its efficiency is
Answer: B
Efficiency is one minus the penetration, so \( 1 - 0.004 = 0.996 \). Quoting penetration rather than efficiency makes the comparison between good devices far clearer, since 99.6 and 99.8 per cent differ by a factor of two in what escapes.
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