A current density of _____ is ilsed for large power transformers with forced circulation
of oil or with water cooling coils
(a) 1.5 to 2.5 A/mm2
(b) 3.5 to 4.5 A/mm2
(c) 4.0 to 5.0 A/mm2
(d) 5.4 to 6.2 A/mm2
of oil or with water cooling coils
(a) 1.5 to 2.5 A/mm2
(b) 3.5 to 4.5 A/mm2
(c) 4.0 to 5.0 A/mm2
(d) 5.4 to 6.2 A/mm2