In a split-phase motor, the start winding is disconnected before reaching full speed.

In a split-phase motor, the start winding is disconnected before reaching full speed.

• A. True
• B. False
• C. Sometimes
• D. Never

Answer: (A)

In a split-phase motor, the starting winding provides the initial phase-shifted torque needed to start rotation. Once the rotor nears running speed, the start winding is disconnected—typically by a centrifugal switch or relay—so it no longer carries current during run. This prevents overheating and wasted energy in the start winding, while the motor continues to run on the main winding with the rotating field sustained. Therefore, the statement is true: the start winding is disconnected before reaching full speed. (Note: other single-phase motor types, like capacitor-start or permanent-split capacitor motors, have different run behaviors, but for the classic split-phase design, the start winding is removed before full speed.)

In a split-phase motor, the starting winding provides the initial phase-shifted torque needed to start rotation. Once the rotor nears running speed, the start winding is disconnected—typically by a centrifugal switch or relay—so it no longer carries current during run. This prevents overheating and wasted energy in the start winding, while the motor continues to run on the main winding with the rotating field sustained. Therefore, the statement is true: the start winding is disconnected before reaching full speed. (Note: other single-phase motor types, like capacitor-start or permanent-split capacitor motors, have different run behaviors, but for the classic split-phase design, the start winding is removed before full speed.)