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The convection due to air is 10 times the convection due to oil.

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The convection due to air is 10 times the convection due to oil.

(a) true

(b) false

I had been asked this question at a job interview.

This question is from Temperature Rise in Transformers in division Design of Transformers of Design of Electrical Machines

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Correct choice is (b) false

Explanation: The convection due to oil is 10 times the convection due to air. This constitutes a major valuable property of oil as a cooling medium.

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