Discussion
A device reduces particulate from \( 8.4 \) g/m\(^3\) to \( 0.21 \) g/m\(^3\). Its collection efficiency is
Answer: A
The efficiency is \( (8.4-0.21)/8.4 = 0.975 \). Efficiency figures alone can mislead, since a device at 97.5 per cent still passes a fifth of a gram per cubic metre, and it is the outlet concentration that a standard is written against.
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