What should be the reason for Low insulation resistance b/w windings or b/w core & winding in a transforme

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What should be the reason for Low insulation resistance b/w windings or b/w core & winding in a transformer?

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Option C: This may be due to moisture, line surge or lightning discharges

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Practice and solve "What should be the reason for Low insulation resistance b/w windings or b/w core & winding in a ..." for Electrical - Economics for Engineers. The correct answer is Option C: This may be due to moisture, line surge or lightning discharges. Detailed step-by-step solution, conceptual clarity, and formulas on Examoogle.

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Option A: more acidity in oil

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Option B: Fore fittings/nut bolts are loose

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Option D: All of these

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