A current density of ________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
A3.5 to 4.5 A/mm2
B4.0 to 5.0 A/mm2
C5.4 to 6.2 A/mm2
D1.5 to 2.5 A/mm2
Correct answer
C. 5.4 to 6.2 A/mm2
Explanation
The correct answer is 5.4 to 6.2 A/mm2.