Discussion
The purpose of bushings in a transformer is to ______.
Answer: B
A bushing in a transformer is the insulated passage by which a winding terminal comes out through the grounded metal tank. Its purpose is to provide electrical isolation between the winding terminals and the grounded tank, so the high voltage does not flash over to the tank. It does not isolate the winding from the core inside the tank, which is the job of the insulation, and it is not meant for magnetic isolation. The answer is option (B).
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