Answer / saravanan.p

The mutual induction(M=L.dt/dI) between primary and
secondary windings will occurs due to the flex (Magnetic
Field). This flex comes due to sinusoidal wave only.In DC,
which has no sinusoidal wave. While giving the DC to
transformer windings, The winding will simply act as a
conductors. Due to cooper loss (no iron loss), the windings
will get heat and the temperature rising affect the
windings also.

Answer / raghavendran

you require a variable flux to induce an emf in a coil.If u
give a DC input,It will only damage the winding and the
insulation.

Answer / ibrahim

changing flux only induce ef
changing flux is created by either rotating a part inside
the constant or with alternating flux or both
if emf not induced there is no flux in secondary which is
only opposing so core will be heated...........

Answer / praveen kumar gupta

If DC is applied to transformer its winding will act as
source of unidirectional flux which causes core saturation
(if DC supply of sufficient magnitude is applied
continuosly).Thee will not be indused EMF in either
winding.Due to this reason transformers are not used in DC
supply .

Answer / abm

M=LdI/dt. When we switch
on the dc supply,its value will
increase from zero to a
particular value within a very
small time interval,which
means dt~0,so the value of M
will be infinite.so Output
voltage will be high

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