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To raise a precipitator from \( 98.2 \) to \( 99.5 \) per cent at the same flow and migration velocity, the plate area must rise from \( 4000 \) m\(^2\) to about

  • A.5300 m\(^2\)
  • B.4400 m\(^2\)
  • C.8000 m\(^2\)
  • D.4100 m\(^2\)

Answer: A

The exponent must move from 4 to \( -\ln 0.005 = 5.30 \), so the area rises in the same ratio to 5300 square metres. A third more steel for one and three tenths of a percentage point is the characteristic economics of precipitator design.

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