Some large transformers, especially those enclosed in vaults where air circulation is not practical, may have their cooling oil circulated by pumps through ____-cooled heat exchangers.
A) Askarel
B) air
C) water
D) freon

Question

Quizplus · Accepted Answer

Water-cooled heat exchangers are commonly used for large transformers in vaults where air circulation is not practical. Water is an efficient coolant and can handle a large amount of heat generated by the transformer. Askarel is a type of PCB coolant that is no longer used due to environmental concerns. Air-cooled heat exchangers may not be sufficient for large transformers in enclosed spaces. Freon is a type of refrigerant and not a suitable coolant for transformers.

Some Large Transformers, Especially Those Enclosed in Vaults Where Air