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In an oil filled transformer, the application of oil is for ___________

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In an oil filled transformer, the application of oil is for ___________

(a) cooling

(b) insulation

(c) both cooling and insulation

(d) preventing the accumulation of dust

This question was addressed to me in an internship interview.

My question is from Transformer Phasor Diagram in chapter Transformers of Electrical Machines

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Correct answer is (c) both cooling and insulation

To elaborate: Oil can be used not only for cooling but also for insulation from the metallic parts.

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