Discussion
Overall penetration through three devices of \( 80 \), \( 90 \) and \( 99 \) per cent efficiency is
Answer: B
The penetrations multiply, giving \( 0.20 \times 0.10 \times 0.01 = 0.0002 \). Arranging a coarse pre-cleaner ahead of a fine collector in this way protects the expensive device and is standard practice on a dirty gas stream.
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