What type of motor is used in a wye delta starting method that allows for both wye and delta configurations?

The correct choice reflects the capability of the motor to be reconfigured between wye (Y) and delta (Δ) connections during the starting process. In the wye-delta starting method, a three-phase motor is designed with multiple leads, typically six or twelve.

These additional leads allow the motor to be connected in a wye configuration initially, which reduces the voltage and therefore the starting current. Once the motor reaches a specific speed, it can be switched to the delta configuration, where it operates at full voltage and power. This method is beneficial for reducing mechanical stress and electrical demand during the motor's startup phase.

Single-phase and two-lead motors are not applicable, as they cannot utilize the wye-delta starting technique designed for three-phase systems. A standard three-phase motor without the necessary leads would not be able to switch between configurations and would therefore not meet the requirements of this starting method.