The start windings have more turns than the run windings.

Prepare for the essential 636 Period 3 Motor Final Test with comprehensive flashcards and detailed questions. Access explanations and hints for each question to ace your exam!

The idea being tested is how the start winding is sized to create a phase-shifted starting current. In single‑phase induction motors, the start winding is designed to provide the necessary phase difference to start torque, and its impedance is tuned to limit current and shape that phase shift.

Having more turns in the start winding increases its inductive reactance and overall impedance at the supply frequency. This reduces the starting current in that winding and makes the current in the start winding lag the current in the run winding by a larger angle. That larger phase difference between the two windings helps produce the torque needed to start the rotor moving. The run winding, which carries current continuously, is typically designed for efficient operation and thus has fewer turns (lower impedance) than the start winding.

So, the start winding having more turns is consistent with creating the right phase relationship and starting torque.