What is the main purpose of the auxiliary winding on a split-phase, single-phase motor?

Correct Answer: Option B — provide starting torque

Single-phase motors produce a pulsating, non-rotating magnetic field at standstill. The auxiliary winding, often combined with a capacitor or centrifugal switch, creates a phase-shifted magnetic field. This provides the necessary starting torque to initiate rotation, after which the auxiliary winding is typically disconnected to improve efficiency.