Which of the following defines the operating range of a dual-voltage motor?

A dual-voltage motor is designed to operate in two different voltage configurations, allowing it to function effectively under varying electrical supply conditions. This capability is particularly useful in applications where the available voltage may differ, enabling flexibility and efficiency in its deployment.

The dual-voltage configuration typically allows the motor to be connected to different voltage systems, such as 230V or 460V, depending on the requirements of the installation. This adaptability not only helps in meeting specific operational needs but also enhances the versatility of the motor for different applications and environments.

Focusing on the other options, a single voltage operation indicates that the motor would only function at one specific voltage, lacking the flexibility that dual-voltage motors provide. Operating at half voltage does not accurately describe the dual-voltage feature, as it implies the motor's operation is limited to reduced voltage levels rather than switching between two predefined voltages. Lastly, stating that no voltage changes are allowed incorrectly suggests a fixed operation mode that does not reflect the design intent of a dual-voltage motor. Thus, the ability to operate under two selectable voltage configurations is key to understanding the unique operational feature of dual-voltage motors.