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if dc excitation is used to produce manetic flux in rotating
machines then ehy it is not used in transformers.
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Answer Posted / dileep
actually emf s are two types 1).statically induced emf 2).dynamically induced emf .we r giving dc suply while we are genarating dynamically induced emf's because emf is induced in the conductors wen there is some relative motion between conductor & field .if we r giving ac supply to rotating machines relative motion is zero that s why we r giving dc supply to rotating ma chines & this emf is due to self inductance .. but in case of transformers emf is due to mutual inductance
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