If the supply frequency to the transformer is increased, the iron loss
- A. Will increase
- B. Will decrease
- C. Will not change
- D. May reach zero
Answer: A. Will increase
Explanation: Hysteresis loss Wh ∝ f·Bm^(1.6) and eddy current loss We ∝ f²·Bm². If supply voltage is not fixed or flux is maintained, core losses increase with frequency.