Alberta Boilers Safety Association (ABSA) Practice Test

Transformers generate heat during operation due to electrical losses, and efficient cooling is essential to maintain their performance and prevent damage. One common method of cooling transformers is by placing the core and coils in an oil-filled tank. This oil serves multiple purposes: it absorbs heat generated by the transformer components, it helps in the dissipation of that heat into the surrounding environment, and it provides insulation for the electrical components. The oil also plays a role in preventing corrosion and protecting the transformer from environmental contamination.

Other methods of cooling, such as using water sprays or operating without any cooling mechanism, are not standard practices for transformers. The use of pyrene as a coolant is uncommon and not suitable for transformer design, as oil has been widely established as an effective cooling and insulating medium.