After a single-phase motor has started, which component remains in the circuit?

After a single-phase motor has started, which component remains in the circuit?

• A. Start capacitor
• B. Start winding
• C. Run capacitor
• D. Centrifugal switch

Answer: (C)

In a single-phase motor, after it has successfully started, the run capacitor remains in the circuit. The run capacitor is designed to improve the efficiency and performance of the motor during normal operation. It helps to provide a phase shift that enhances the motor's torque characteristics when it is running. On the other hand, the start capacitor is only used during the starting phase to create an initial phase shift that allows the motor to overcome inertia and begin rotating. Once the motor reaches a certain speed, the start capacitor is typically disconnected from the circuit, often by a centrifugal switch or relay. Similarly, the start winding also remains engaged only during the startup phase; it is deactivated after the motor reaches its operational speed. The centrifugal switch plays a role in disconnecting the start winding and capacitor once the motor achieves its running speed, ensuring that only the run capacitor is left in the circuit to maintain efficient operation. Thus, the run capacitor is the component that continues to support the motor during its normal operation cycle.

In a single-phase motor, after it has successfully started, the run capacitor remains in the circuit. The run capacitor is designed to improve the efficiency and performance of the motor during normal operation. It helps to provide a phase shift that enhances the motor's torque characteristics when it is running.

On the other hand, the start capacitor is only used during the starting phase to create an initial phase shift that allows the motor to overcome inertia and begin rotating. Once the motor reaches a certain speed, the start capacitor is typically disconnected from the circuit, often by a centrifugal switch or relay. Similarly, the start winding also remains engaged only during the startup phase; it is deactivated after the motor reaches its operational speed.

The centrifugal switch plays a role in disconnecting the start winding and capacitor once the motor achieves its running speed, ensuring that only the run capacitor is left in the circuit to maintain efficient operation. Thus, the run capacitor is the component that continues to support the motor during its normal operation cycle.