Discussion
The disadvantage of using impregnated paper as cable insulation is ______.
Answer: C
Impregnated paper is a cable insulation with high insulation resistance, high dielectric strength and low capacitance, which are its advantages. Its disadvantage is that it is hygroscopic: it absorbs moisture from the air if the lead sheath is damaged, and the moisture lowers its insulation level, so the cable must be sealed. The other three options are advantages and not disadvantages. The answer is hygroscopic nature, option (C).
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