The efficiency of a transformer, under heavy loads, is comparatively low because________?
Avoltage drop both in primary and secondary becomes large
Bsecondary output is much less as compared to primary input
Ccopper loss becomes high in proportion to the output
Diron loss is increased considerably
Correct answer
C. copper loss becomes high in proportion to the output
Explanation
The correct answer is copper loss becomes high in proportion to the output.