Multiple choice general knowledge science & technology

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

  1. the heating effect of current alone

  2. hysteresis loss alone

  3. both the heating effect of current and hysteresis loss

  4. intense sunlight at noon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Transformer heating results from copper losses (I²R heating in windings) and core losses. Hysteresis loss occurs as the core is repeatedly magnetized and demagnetized by AC. Eddy current losses also contribute but aren't listed as options.

Keep practicing — related questions