What output can be produced by connecting three 240 × 480 - 120/240 volt single-phase transformers?

Connecting three 240 × 480 - 120/240 volt single-phase transformers can yield two distinct outputs due to the nature of transformer connections and the outputs available from the transformers.

When you connect these transformers in a specific configuration, such as a wye (Y) or delta (Δ), you can achieve a three-phase output of 240 volts. In this scenario, each transformer contributes a phase, and since they are designed for 240 volts, the output is effectively 240 volts in a three-phase, three-wire system.

Additionally, if the transformers are configured to provide a 120/240-volt output, they can be arranged so that you also obtain a 120/240 volt three-phase, four-wire system. This setup is useful for providing both 120-volt and 240-volt services in a commercial or residential setting, where 120 volts is often used for standard outlets and 240 volts for larger appliances.

Therefore, the choice that asserts both outputs can be produced—240 volts 3Ø, 3-wire and 120/240 volts 3Ø, 4-wire—is correct, as it encompasses the potential configurations and their output capabilities.