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Discussion

Consider the following statements about deriving tolerances.
1. Historical acceptance data grounds the tolerance in practice.
2. A theoretical threshold may prove impractical in production.
3. The just noticeable difference is the correct commercial tolerance.

  • A.1 and 2 only
  • B.3 only
  • C.1 only
  • D.All of them

Answer: A

The first two are correct and reflect sound practice. The third would reject the great majority of commercially satisfactory production. Threshold is far tighter than commercial tolerance. Most acceptable production would be rejected.

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