Which statement about a capacitor-start single-phase motor is true?

Which statement about a capacitor-start single-phase motor is true?

• A. It will have a high starting torque and a high starting current
• B. It has low starting torque
• C. It cannot start under load
• D. It is always a three-phase motor

Answer: (A)

The main idea is that capacitor-start single-phase motors create a strong starting torque by using a starting winding with a capacitor to shift the current and form a rotating magnetic field. This setup draws a higher current during startup because the starting winding is energized with that capacitor-assisted current until the motor comes up to speed. Once running, a switch disconnects the starting winding, and the motor continues on the main winding with a much lower running current. That combination—high starting torque and high starting current—is why the statement is true. The motor isn’t inherently low-torque at start, it isn’t limited to starting under no load, and it isn’t a three-phase motor; it’s designed for single-phase supply.

The main idea is that capacitor-start single-phase motors create a strong starting torque by using a starting winding with a capacitor to shift the current and form a rotating magnetic field. This setup draws a higher current during startup because the starting winding is energized with that capacitor-assisted current until the motor comes up to speed. Once running, a switch disconnects the starting winding, and the motor continues on the main winding with a much lower running current. That combination—high starting torque and high starting current—is why the statement is true. The motor isn’t inherently low-torque at start, it isn’t limited to starting under no load, and it isn’t a three-phase motor; it’s designed for single-phase supply.