With core type transformers, the limbs are stepped so as to
- A. reduce the iron material and therefore iron loss
- B. provide better cooling
- C. reduce the conductor material and therefore I^2 R loss
- D. provide more mechanical strength to the core
Answer: C. reduce the conductor material and therefore I^2 R loss
Explanation: Stepped (cruciform) limbs fill the circle better, reducing mean turn length and copper, hence I²R loss.