2017 · Q15
After using for some time, big transformers get heated up. This is due to the fact that
- 1current produces heat in the transformers
- 2hysteresis loss occurs in the transformers
- 3liquid used for cooling gets heated
Select the correct answer using the code given below :
General KnowledgePhysics
- A1 only
- B2 and 3 only
- C1 and 2 only
- D1, 2 and 3
Explanation
Big transformers heat up because of copper losses — I²R heating in the windings due to current (statement 1) — and iron losses in the core, namely hysteresis loss and eddy-current loss (statement 2). These are the two genuine causes of heating. The cooling liquid (transformer oil) getting heated is a consequence of the transformer's heating, not a cause of it. Hence statements 1 and 2 only are correct.