A 50 kVA transformer has constant iron loss 500 W and full-load copper loss 800 W. Determine the load, in kVA, for maximum efficiency, rounded to two decimal places.
Physics · Electromagnetic Induction · Mutual Inductance
JEE Mains NEET

Question

A 50 kVA transformer has constant iron loss 500 W and full-load copper loss 800 W. Determine the load, in kVA, for maximum efficiency, rounded to two decimal places.

G1 Physics · Accepted Answer

At maximum efficiency copper loss equals iron loss: 800x²=500, so x=√(5/8)=0.79057. Required load=50x=39.53 kVA.