What will be the eddy current loss if the supply frequency of a transformer becomes double?

Ans: (D) Remains Same

Explanation:

Eddy Current loss in transformer is denoted as,

Where, Ke = eddy current constant, Kf = form factor. Hence apparently, the eddy current loss Pe ∝ f2, but for any given voltage, if f decreases, Bm increases correspondingly and if f increases Bm decreases correspondingly. Hence the eddy current loss Pe at any given voltage is independent of frequency.