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What is the formula for the cooling co-efficient to the rotating field coils?

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What is the formula for the cooling co-efficient to the rotating field coils?

(a) cooling coefficient of rotating field coils = 0.05 to 0.08 / 1 + armature voltage

(b) cooling coefficient of rotating field coils = 0.05 to 0.08 / 1 – armature voltage

(c) cooling coefficient of rotating field coils = 0.08 to 0.12 / 1 + armature voltage

(d) cooling coefficient of rotating field coils = 0.08 to 0.12 / 1 – armature voltage

This question was addressed to me in semester exam.

I would like to ask this question from Design of Field Winding in section Design of Synchronous Machines of Design of Electrical Machines

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The correct option is (c) cooling coefficient of rotating field coils = 0.08 to 0.12 / 1 + armature voltage

Best explanation: The armature voltage is first calculated for the calculation of the cooling coefficient of rotating field coils. The cooling coefficient is used to calculate the temperature rise.

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