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How do the walls of the transformer tank dissipate heat?

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in Design of Electrical Machines by (687k points)
How do the walls of the transformer tank dissipate heat?

(a) by radiation

(b) by convection

(c) by conduction

(d) by convection and radiation

This question was posed to me during an online interview.

I would like to ask this question from Temperature Rise in Transformers topic in portion Design of Transformers of Design of Electrical Machines

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Correct option is (d) by convection and radiation

To explain: The plain walled tanks of the transformer also dissipate heat through convection and radiation. The property is similar to that of the rotating machinery.

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