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Cores of large power transformers are made from which one of the following?
1. Hot-rolled steel
2. Cold-rolled non-grain oriented steel
3. Cold-rolled gain oriented steel
4. Ferrite

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Correct Answer - Option 3 : Cold-rolled gain oriented steel

Cores of large power transformers are made from Cold-rolled gain oriented (CRGO) steel. The direction of magnetization in all the grains of this CRGO material is along the edges, therefore overall permeability of silicon steel will be increased. This process is called cold rolling grain orientation process.

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