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Which is the most widely used material in the core of the transformer?

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Which is the most widely used material in the core of the transformer?

(a) cold rolled grain oriented sheet steel

(b) cold rolled grain steel

(c) soft iron

(d) steel

The question was asked in an interview for job.

This intriguing question originated from Transformer Construction in chapter Transformers of Electrical Machines

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Correct option is (a) cold rolled grain oriented sheet steel

The best I can explain: CRGO has magnetization in the rolling direction and low core losses and very high permeability than present materials.

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