Answer / engr. kashif

All transformers are usually of smoke grey color
bcz this color is poor absorber of heat and a good radiator of heat.
so the transformer during its operation is able to radiate
its internal heat with the help of this color.

Answer / sarmadahmed

Their color is same because most of the transformers are made up of same material (soft iron core).

Answer / srikanta

This is a ISI standardise color for soft iron core

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