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The purpose of a temperature rise test is to confirm that

  • A.the machine's efficiency matches the value quoted for it
  • B.the insulation will withstand the specified high voltage
  • C.the machine is mechanically balanced within its limits
  • D.the machine can carry its rated load without exceeding its class limit

Answer: D

Correct answer: the machine can carry its rated load without exceeding its class limit

The temperature rise test establishes the machine’s thermal rating: run at rated output until temperatures stabilise, the rise must stay within the limit for its insulation class. Since insulation life halves for roughly every ten degrees of excess, this test decides how long the machine will last rather than merely whether it works.

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