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If transformer frequency is changed from 50 Hz to 60 Hz the ratio of eddy current loss 50 Hz to 60 Hz, at constant voltage will be

The eddy current loss in a transformer is directly proportional to the square of the frequency. Therefore, if the frequency is changed from 50 Hz to 60 Hz, the ratio of eddy current losses at the two frequencies can be calculated as:

Ratio of eddy current loss = (eddy current loss at 60 Hz) / (eddy current loss at 50 Hz)

Since the voltage is kept constant, the eddy current loss is proportional to the square of the frequency, and we can write:

(eddy current loss at 60 Hz) / (eddy current loss at 50 Hz) = (60/50)2 = 1.44

Therefore, the ratio of eddy current loss at 50 Hz to 60 Hz, at constant voltage, is 1:1.44, which simplifies to 25/36.