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A current density of ____ is used for large power transformers with forced circulation of oil or with water cooling coils | |
A. | 1.5 to 2.5 A/mm2 [Wrong Answer] |
B. | 3.5 to 4.5 A/mm2 [Wrong Answer] |
C. | 4.0 to 5.0 A/mm2 [Wrong Answer] |
D. | 5.4 to 6.2 A/mm2 [Correct Answer] |