In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?
Correct answer: C. 15 percent
- A. 5 percent
- B. 10 percent
- C. 15 percent
- D. 30 percent
- E. none of the above
Explanation
With hot-rolled steel, the yoke is typically made about 15 percent larger in cross-sectional area than the core because its magnetic flux density and material utilization differ from those of the core. Therefore, the usual design allowance is 15 percent.
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