The purpose of providing an iron core in a transformer is to_____________?
Correct answer: C. decrease the reluctance of the magnetic path
- A. provide support to windings
- B. reduce hysteresis loss
- C. decrease the reluctance of the magnetic path
- D. reduce eddy current losses
Explanation
Iron has much higher permeability than air, so its inclusion greatly decreases the reluctance of the magnetic path and allows flux to pass with a smaller magnetising current. Supporting the windings is a structural function, not the main electromagnetic purpose.
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