What is one of the main limitations of using part winding starters?

The choice that highlights a main limitation of part winding starters being unsuitable for high inertia loads is correct because part winding starters operate with a specific sequence designed to reduce the inrush current when starting an induction motor. However, for motors driving high inertia loads, this sequential application of power may not provide sufficient starting torque. High inertia loads require more immediate torque to overcome the resistance and bring the motor up to speed. A part winding starter may struggle in such situations, potentially leading to inadequate performance or stalling.

In contrast, the other options refer to different characteristics or applications of part winding starters that don’t directly address their performance limitations specific to high inertia loads. While part winding starters are often used in various contexts, they may not be ideally suited for scenarios where high starting torque is essential.