Some transformers require increased cooling provided by a material that will absorb heat from the windings and core material. One common oil used for this purpose is known as Askarel. A special type of Askarel oil, called polychlorinated biphenyl (PCB), is a highly toxic substance now banned in the United States except for use with transformers.

Question

Quizplus · Accepted Answer

Askarel is a generic term for PCBs used in transformers, but PCB itself is not a type of Askarel; rather, it is the substance that makes up Askarel. PCBs are banned due to their toxicity and environmental impact, not permitted for use in new transformers.

Some Transformers Require Increased Cooling Provided by a Material That