Dual-voltage 3-phase motors have ___ windings per phase.

Dual-voltage 3-phase motors are designed to operate at two different voltage levels, typically allowing them to be connected to either a higher or lower voltage supply. The key to achieving this capability lies in having multiple windings per phase.

In the case of dual-voltage motors, there are generally two separate sets of windings for each phase. One set is configured to operate at a lower voltage, while the other is meant for a higher voltage. By employing two windings per phase, the motor can effectively switch between these voltage configurations, which does not only make it versatile but also enhances its applicability in various electrical systems.

Thus, the correct answer indicates that dual-voltage 3-phase motors utilize two windings per phase, which allows for proper functioning under different voltage conditions.