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Repeating a machine test in service after some years of operation is valuable because

  • A.the standards require every machine to be retested annually
  • B.a single reading is sufficient to establish the condition
  • C.a trend reveals deterioration that a single reading cannot
  • D.the machine's efficiency improves with age in service

Answer: C

Insulation resistance, polarisation index and partial discharge all mean far more as a trend than as a number, since the acceptable range is wide. Keeping the original works readings for comparison is therefore worth the filing space.

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