Answer / rakesh gupta

No, A dc transformer is not possible. A transformer secondary coil generates voltage(induced) when there is a variation of flux though its coil which is produced by pulsating current in the primary coil which is not possible with dc source. however a dc voltage regulation can be possible with dc to dc converter.  

Answer / thran

not possible because there"s no mutual induction...

Answer / sauvik biswas

Chopper is often said to be dc transformer

Answer / pavali.sreenivasulu

not possible because of transformer winding will be damage

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