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Three transformers having identical dimensions but with core of iron, aluminium and wood are wound with same number of turns and have same supply. Then choose the order for eddy current losses.

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Three transformers having identical dimensions but with core of iron, aluminium and wood are wound with same number of turns and have same supply. Then choose the order for eddy current losses.

(a) wood > aluminium > iron

(b) aluminium > iron > wood

(c) iron > wood > aluminium

(d) iron > aluminium > wood

The question was asked in a national level competition.

My question is taken from Autotransformers topic in portion Transformers of Electrical Machines

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Correct choice is (a) wood > aluminium > iron

Easy explanation: The eddy current losses are dependent on resistance offered to the currents. Wood is an insulator so it will get heated up most.

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