Electrical Engineering XYZ MCQs
Capacitor in split phase induction motor is used to:
- Start the motor
- Improve the starting torque
- Reduce the harmonics
- Improve the power factor
Correct answer: 1. Start the motor
Explanation: In a split phase induction motor, the capacitor is primarily used to improve the starting torque. The capacitor is connected in series with the auxiliary winding, creating a phase difference between the currents in the main and auxiliary windings. This phase shift results in a rotating magnetic field, which significantly increases the starting torque of the motor. This assists in the initial starting of the motor. Once the motor reaches a certain speed, the capacitor and auxiliary winding are often disconnected from the circuit via a centrifugal switch or other control device.