Discussion
A low polarisation index on a machine winding suggests
Answer: C
Correct answer: moisture or contamination in the insulation
A low index means the current is not decaying with time, which happens when a conductive path - moisture, dirt, carbon tracking - carries a steady leakage that swamps the polarisation current. The remedy is drying and cleaning, and a machine failing the index should be dried before any high-voltage test is applied.
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