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Which change would NOT raise a precipitator's efficiency?

  • A.Adding plate area
  • B.Adding a further field in series
  • C.Conditioning the dust to lower its resistivity
  • D.Increasing the gas flow rate through it

Answer: D

A higher flow shortens the residence time and moves the Deutsch exponent the wrong way. The other three each raise the product of area and migration velocity relative to the flow, which is what the equation depends on.

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