TPC Single Phase Motors Practice Test

When the start winding of a single-phase motor burns out, the motor typically fails to start. Single-phase motors rely on both the run and start windings to create the necessary phase shift for starting torque. The start winding is specifically designed to help the motor overcome inertia and begin its rotation. If this winding is compromised, the motor lacks the additional torque required to initiate movement.

Moreover, if the motor is unable to start, it may draw excessive current for an extended period while trying to do so, leading to overheating. This condition can potentially damage the motor further or affect other components of the electrical system if not addressed. Therefore, the primary result of a burned-out start winding is a failure to start, combined with the risk of overheating, which makes this response the accurate one.