Question

In a transformer,eddy-current loss is 1000 watts which is half of the total core loss. If thickness of lamination and frequency are increased by 10%, What is the new core-losses?

(a) 3200W

(b) 3300W

(c) 2200W

(d) 3100W

The question was asked in an interview.

Origin of the question is Transformer as a Magnetically Coupled Circuit in division Transformers of Electrical Machines

Answer 1

The correct choice is (a) 3200W

The explanation: Pe = 1000W, Pi = 2000W

             Here, V/f = constant

    Pe will be same 1000W, Pi = 200+2000 = 2200W

    Total core losses = 1000+2200 = 3200W.