Answer / murugesan

insulating

Answer / ranjit

crude oil

Answer / akshay

coolent oil is used for cooling the teransfamoer .

Answer / asesha

as u know oil in transformer used to cool....
so as from basic law navratna oil is used ....
simple

Answer / ys.kumar.

poer oil is used 4 tr/fr..grade i dont know perfectly..

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