Auto-transformer starters, sometimes called starting compensators, are sometimes used with larger polyphase induction motors. What function do they perform?

Correct Answer: Option D — they reduce the voltage applied to the motor during the starting period

Auto-transformer starters reduce the voltage applied to the motor terminals during the starting sequence. By lowering the voltage, the inrush current is significantly reduced, which helps prevent excessive voltage drops on the ship's electrical distribution system during the starting of large, high-horsepower induction motors.