A single-phase capacitor-start induction motor starts, comes up to about 75% rated speed, slows down to a lower speed, and accelerates again. Where is the problem most likely to be?

Correct Answer: Option C — running winding

A capacitor-start induction motor that reaches speed, drops back, and re-accelerates suffers from a running winding issue or open circuit, forcing it to rely intermittently on the auxiliary start winding. IEEE 45 testing protocols require inspecting main winding integrity and centrifugal switch sequencing.