Electrical Engineering XYZ MCQs
Speed control by variation of field flux results in:
- Variable power drive
- Constant power drive
- Constant torque drive
- None of the above
Correct answer: 2. Constant power drive
Explanation: In many applications, it’s desirable to maintain a constant power output regardless of the speed. This is particularly useful in applications where the load may vary, but the desired performance remains constant. When the field flux is varied to control speed, the power delivered by the motor remains relatively constant over a range of speeds. This is because as the speed decreases, the torque increases (due to the characteristics of the motor), resulting in a nearly constant power output.