Discussion
Embedded temperature detectors in a machine's winding give
Answer: B
Correct answer: the hot spot temperature rather than the mean
Detectors are embedded at the points expected to run hottest, typically between the coil sides in the slot, so they report the worst place rather than an average. The resistance method, by contrast, gives the mean temperature of the whole winding, which will always be lower - and it is the hot spot that determines insulation life.
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