Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Large transformers, when used for some time, become hot and are cooled by circulating oil. The heating of transformer is due to
Text Solution
Verified by ExpertsThe correct answer is:
C
Step 1: Understand the causes of heating in transformers.
Large transformers generate heat during operation because of two primary mechanisms:
Step 2: Recognize that both of these effects contribute to the overall heating of the transformer.
Therefore, the correct answer is: Both the hysteresis loss and heating effect of current.
Large transformers generate heat during operation because of two primary mechanisms:
- Heating effect of current: When electric current flows through the windings of the transformer, it encounters resistance, leading to I²R losses (where I is the current and R is the resistance). This is known as Joule heating.
- Hysteresis loss: As the magnetic core of the transformer magnetizes and demagnetizes, energy is lost due to the hysteresis effect. This is caused by the lagging of magnetic material's magnetization compared to the applied magnetic field, leading to energy dissipation as heat.
Step 2: Recognize that both of these effects contribute to the overall heating of the transformer.
Therefore, the correct answer is: Both the hysteresis loss and heating effect of current.
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