Electrical Engineering XYZ MCQs
For very sensitive and wide speed control, the preferable control method is:
- Ward-Leonard control
- Multiple voltage control
- Field control
- Armature control
Correct answer: 1. Ward-Leonard control
Explanation: Ward-Leonard Control involves using a separately excited DC motor (called the ‘motor-generator set’) to control the speed of another DC motor. The speed control is achieved by varying the field current of the generator motor. This method offers very sensitive and wide speed control because it allows for smooth variation of the output voltage and hence the speed of the controlled motor. It is often used in applications where precise speed control is required, such as cranes, elevators, and rolling mills.