Q
A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
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A
A. 1.5 to 2.5 a/mm2
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B
B. 3.5 to 4.5 a/mm2
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C
C. 4.0 to 5.0 a/mm2
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D
D. 5.4 to 6.2 a/mm2
Correct Answer:
D. D. 5.4 to 6.2 a/mm2