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

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

A).  The heating effect of current alone

B).  Hysteresis loss alone

C).  Both the heating effect of current and hysteresis loss

D).  Intense sunlight at noon

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