An advantage of a stepper motor and reason for its popularity is

• A. Low cost
• B. Simple drive electronics
• C. Good torque
• D. All of the above are advantages

Answer: (D)

Stepper motors are popular because they combine cost efficiency, straightforward control, and useful torque characteristics. They provide precise, repeatable positioning with simple electronics: you energize windings in a sequence, which lets you control steps without complex feedback in many setups. They offer good torque at low to moderate speeds, including holding torque when energized, which helps lock the position and resist disturbances. The hardware is typically inexpensive and robust, with fewer components like encoders or servo drives needed. Put together, these factors make all of the listed advantages true, explaining why this option is the best choice.