Which of the following identifies a single-phase motor with a capacitor that remains in the circuit while the motor runs?

The option that identifies a single-phase motor with a capacitor that remains in the circuit while the motor runs is the Permanent Split Capacitor (PSC) motor. In PSC motors, the capacitor is permanently connected to the motor's auxiliary winding, providing a phase shift that enhances the motor's efficiency and performance during operation. This design allows for smoother operation, improved starting torque, and reduced noise compared to other motor types.

The continuous presence of the capacitor in the circuit means that the motor can maintain consistent efficiency and performance characteristics throughout its operation, which is particularly beneficial for applications where the motor runs for extended periods. This characteristic differentiates PSC motors from others, such as those with starting capacitors that disconnect after the motor reaches a specific speed, leading to less efficiency during continuous operation.