Electrical Engineering XYZ MCQs
Semi closed slots or totally closed slots are used in induction motors, essentially to:
- Reduce magnetizing current and improve power factor
- Improve starting torque
- Decrease starting torque
- Increase pull out torque
Correct answer: 1. Reduce magnetizing current and improve power factor
Explanation: Semi-closed or totally closed slots in induction motors help in reducing the magnetizing current. This is because closed slots provide better magnetic circuit closure, which reduces the leakage flux and hence decreases the magnetizing current. By reducing the magnetizing current, the motor operates more efficiently.