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Discussion

The most useful single laboratory check on a cement mill's output is

  • A.the colour, which is said to indicate the burning conditions
  • B.the sulphate content, which is thought to fix the strength
  • C.the moisture content measured on the finished cement
  • D.fineness, since it responds quickly and predicts strength

Answer: D

Fineness can be measured within minutes and correlates well with early strength, so it serves as the control variable. Strength itself takes days or weeks and is confirmation rather than control. The two roles are quite distinct in a quality system.

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