Answer Posted / sunil parmar

for working of any transformer if AC is applied on primary
side of x'mer flux is linked between the two windings and
thus EMF is produced on the secondary side.and is step uped
and downed depending upon the secondary winding...
but if DC is applied as is direct current so no alternating
properties.so no flux linkage and due to very low
reactance and zero frequency in DC will produce
circulating current on primary side of the transformer and
thus will burn the windings

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