The speed of an induction motor is controlled by varying the supply frequency keeping V/f constant, then
- A. Breakdown torque and magnetizing current would both remain constant
- B. Breakdown torque would remain constant but magnetizing current would increase.
- C. Breakdown torque would decrease but magnetizing current would remain constant.
- D. Breakdown torque and magnetizing current both would decrease.
Answer: A. Breakdown torque and magnetizing current would both remain constant
Explanation: With V/f constant, flux, magnetising current and breakdown torque stay (approximately) constant.