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What factor/s does the cooling coefficient depend upon?

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What factor/s does the cooling coefficient depend upon?

(a) speed of the cooling medium

(b) configuration of the surface

(c) speed of the machine and configuration of the surface

(d) speed of the machine or configuration of the surface

This question was addressed to me in an online quiz.

The above asked question is from Losses and Temperature Rise topic in portion Design of Synchronous Machines of Design of Electrical Machines

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The correct answer is (c) speed of the machine and configuration of the surface

To explain I would say: The cooling coefficient depends upon the speed of the machine. The cooling coefficient also depends upon the configuration of the surface.

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