Electrical Engineering XYZ MCQs
With an increase in load, in synchronous motor, the torque or load angle δ:
- Remains unaffected
- Increases
- Decreases
- None of these
Correct answer: 2. Increases
Explanation: In a synchronous motor, the rotor (or the revolving part) rotates at the same speed as the stator magnetic field. The load angle (δ) is the angle between the rotor position and the magnetic field produced by the stator.
When the load on the synchronous motor increases, it means there is more resistance for the rotor to overcome. As a result, the rotor tends to lag behind the rotating magnetic field, leading to an increase in the load angle (δ).
Therefore, with an increase in load, the torque or load angle (δ) in a synchronous motor increases.