Discussion
A machine that has stood idle in a damp place should have its insulation
Answer: C
Correct answer: dried out before any high-voltage test is applied
Absorbed moisture lowers the insulation resistance and provides paths for surface tracking, so applying test voltage to a damp winding may puncture insulation that would have been perfectly sound once dry. Drying and re-testing the insulation resistance and polarisation index comes first; the withstand test comes only after both are acceptable.
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