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The representative fraction of a scale is the ratio of the

  • A.drawing length to the length of the sheet used
  • B.actual length to the maximum length to be measured
  • C.drawing length to the corresponding actual length
  • D.actual length to the corresponding drawing length

Answer: C

Correct answer: drawing length to the corresponding actual length

The representative fraction is defined as drawing length over actual length, both in the same units, so it is dimensionless and independent of the units used. Inverting it is the commonest error and produces a number that looks plausible but multiplies where it should divide.

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