The correct answer is: A. It requires only one winding.
A single-phase induction motor is an electric motor that uses a single alternating current (AC) supply to produce a rotating magnetic field. It is the most common type of induction motor, and is used in a wide variety of applications, including fans, pumps, compressors, and blowers.
Single-phase induction motors are self-starting, meaning that they do not require an external starting device. This is because the stator windings of a single-phase induction motor create a rotating magnetic field. This rotating magnetic field induces a current in the rotor windings, which creates a magnetic field of its own. The interaction of these two magnetic fields causes the rotor to rotate.
Single-phase induction motors can rotate in either direction. The direction of rotation is determined by the phase relationship between the stator and rotor windings. If the stator and rotor windings are in phase, the motor will rotate in one direction. If the stator and rotor windings are out of phase, the motor will rotate in the opposite direction.
Single-phase induction motors are relatively simple and inexpensive to manufacture. They are also reliable and efficient. However, they are not as powerful as three-phase induction motors.
Here is a brief explanation of each option:
- Option A: It requires only one winding. This is correct. A single-phase induction motor has only one winding, which is the stator winding.
- Option B: It can rotate in one direction only. This is incorrect. A single-phase induction motor can rotate in either direction.
- Option C: It is self-starting. This is correct. A single-phase induction motor is self-starting, meaning that it does not require an external starting device.
- Option D: It is not self-starting. This is incorrect. A single-phase induction motor is self-starting.