Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

The heating effect of current alone

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Hysteresis loss alone

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Both the heating effect of current and hysteresis loss

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Solution

The correct option is C Both the heating effect of current and hysteresis loss

Heat loss in a magnetic circuit is due to two reasons one is hysteresis and  other is due to ohmic loss due to eddy current .Laminations and circulatingoil are some of methods to avoid heating. Hysteresis loss is entirelymaterial property while eddy current loss depends on geometry of core and amount of current.

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