For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
A. 2.2 to 3.2 A/mm2

B. 1.5 to 2.0 A/mm2

C. 3.2 to 4.2 A/mm2

D. 1.0 to 1.2 A/mm2

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