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A flour mill's product meets its extraction target but its ash content is consistently too high.

Which part of the mill should be examined first?

  • A.The flour packing line
  • B.The purifiers
  • C.The conditioning system
  • D.The reduction rolls

Answer: B

Correct answer: The purifiers

Extraction is on target, so the mill is recovering the right quantity of flour; the problem is what is in it. Ash means bran, and the machine whose job is to keep bran out of the semolina stream is the purifier, which separates flakes from granules by air current where a sieve cannot. A conditioning fault would usually show as poor extraction as well.

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