Question 120Electricity & Electronics - 1st Asst/Chief

The correct answer is A) an open start winding. In a single-phase permanent split capacitor induction motor, the start winding is used to provide the necessary starting torque. If the start winding becomes open-circuited, the motor will not be able to develop the necessary starting torque and will fail to start. The other options are incorrect because an open start capacitor (C) would prevent the start winding from receiving the necessary voltage, and an open or closed centrifugal switch (B and D) would not directly prevent the start winding from functioning properly.