Which of the following is a benefit of using three-phase induction motors?

Using three-phase induction motors offers several advantages, one of the most significant being the smoother operation due to a constant magnetic field. In a three-phase induction motor, the alternating current produces a rotating magnetic field that is more consistent than that produced by single-phase motors. This continuous rotating field helps to minimize torque pulsations, resulting in less vibration and noise during operation. It also enhances the overall efficiency and performance of the motor, allowing it to handle varying loads more effectively without experiencing sudden changes in speed or torque.

The other listed benefits, while they may be true in some contexts, do not capture the primary advantage of smooth operation. For example, the initial cost may be higher for three-phase systems due to more complex wiring and the need for three-phase power supply. While installation can sometimes be straightforward, it may also require specialized knowledge or equipment, especially in industrial settings where three-phase systems are common. Additionally, three-phase induction motors are designed to operate with specific voltage tolerances, but this characteristic alone does not inherently provide a comparative advantage over other motor types. The constant magnetic field and the resultant smooth operation is the standout benefit that enhances the performance and reliability of three-phase induction motors.