In most cases, a three-phase transformer is basically three ____________________ in a single tank.

• A. resistors
• B. capacitors
• C. single- phase transformers
• D. bushings

Answer: (C)

Three-phase transformers are typically built as three single-phase transformer units housed together in one tank. Each unit handles one phase, and the three units share a common core and enclosure, giving a compact, economical package with coordinated cooling and maintenance. This construction makes manufacturing and servicing straightforward because you’re effectively dealing with three modular transformers rather than one large, single-piece device. Resistors or capacitors aren’t the components that define a transformer, and bushings are only the connection points for the windings, not the fundamental building blocks that establish a three-phase arrangement.