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A special test on an electrical machine is one that

  • A.can only be carried out after the machine has failed
  • B.the manufacturer carries out on the design once only
  • C.the purchaser requests beyond the standard schedule
  • D.the standard requires on every machine without exception

Answer: C

Correct answer: the purchaser requests beyond the standard schedule

Special tests are additional to the standard type and routine schedules, agreed between purchaser and manufacturer for a particular application - noise measurement, a sudden short circuit test, partial discharge measurement, testing at an unusual voltage or frequency. They are priced separately because they are outside the normal contract.

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