What are the
advantage of DC transmission system over AC transmission system?
DC system is
economical for long line
There is no
skin effect in DC system
Corona limits are negligible for DC circuit as compared to AC circuit
All of the
above
All of the
above
DC
transmission system, is more economical than A.C. transmission because in D.C.
skin effect does not occur and corona power losses are very negligible.
Corona loss 
Hence, the correct option is (D).
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