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The lubricants for transformers must have quality of good ________

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The lubricants for transformers must have quality of good ________

(a) dielectric strength

(b) less oiliness

(c) no resistance to oxygen

(d) low load capacity

I have been asked this question during a job interview.

My query is from Selection of Lubricants topic in portion Lubricants of Applied Chemistry

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The correct choice is (a) dielectric strength

The best I can explain: The di electric must be good for the transformers. They are dried, washed and filtered properly and applied with lubricants.

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