Answer Posted / adeel zafar

Transformer oil, or insulating oil, is usually a highly-
refined mineral oil that is stable at high temperatures and
has excellent electrical insulating properties.

It is used in oil-filled transformers, some types of high
voltage capacitors, fluorescent lamp ballasts, and some
types of high voltage switches and circuit breakers. Its
functions are to insulate, suppress corona and arcing, and
to serve as a coolant.

Why induction motor is widely used in industry

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