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What type of heat dissipation takes place when heat flows from oil to walls of a cooler?

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What type of heat dissipation takes place when heat flows from oil to walls of a cooler?

(a) conduction

(b) convection

(c) radiation

(d) conduction and convection

I had been asked this question in final exam.

Question is from Temperature Rise in Transformers topic in division Design of Transformers of Design of Electrical Machines

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The correct choice is (b) convection

Explanation: When heat flows from oil to walls of the cooler, the heat dissipation type is convection. In transformers all 3 types of heat dissipation takes place.

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