Question

Copper losses depend upon the load on the transformer the copper loss at 1/4th of full load is where wc is the copper loss under full load condition

Answer 1

Answer:

So the copper loss at half load is 1/4*1600= 400 watts. Copper loss is proportional to square of load current. At half load, load current becomes half as voltage remains same, so copper loss will become (1/2)^2 times of full load copper loss or 1/4 × 1600 = 400 Watt.

Answer 2

Answer:

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