For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
A
1.0 to 1.2 A/mm<sup>2</sup>
B
1.5 to 2.0 A/mm<sup>2</sup>
C
2.2 to 3.2 A/mm<sup>2</sup>
D
3.2 to 4.2 A/mm<sup>2</sup>
Correct Answer: 2.2 to 3.2 A/mm<sup>2</sup>
