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Sampling of the crushed stone for analysis is normally

  • A.taken only on those occasions when the finished cement fails a test
  • B.quite unnecessary wherever the quarry is of uniform chemistry
  • C.automatic and continuous rather than occasional and manual
  • D.carried out once a week by a technician from the laboratory

Answer: C

A cross-belt sampler takes increments as the material passes, giving a composite that represents the whole stream. Occasional grab samples would miss exactly the short-term variation that the control system exists to correct.

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