Answer / www.pooneetkashyap.blogspot.co

from emf equation of X'mer
E=4.44fNAB (http://en.wikipedia.org/wiki/Transformer)

where E=voltage
f=frequency
A=Area
N=number of turns
B=magnetic flux density
in general we can say
A=E/(4.44fNB)
for constant value of E,N,B
if we increase F,then Area of core will decreases means size
of transformer will reduce.

Answer / satish kumar(satty)

EMF of a transformer increases with frequency. As a result the transformer can be physically more compact because a given core is able to transfer more power without reaching saturation and fewer turns are required to achieve the same impedance.

Answer / jaipal rathod

from transeformer eqn size of the transeformer is inversely proportional to the supply freqency...

e=4.44 f BA N

flux=B*A

SO,A=1/F
When freq increase,size or area of the t/f is decreased

Answer / chandan kumar

E=4.44bafn V
so if we increase the supply frequency the induced emf
increases
and the active power of transformer is given by P=VI,
SO POWER DEVELOPED IS INCREASES of the same t/f
if we increase the frequency
therefor the size is decreases

Answer / sandip

IN TRANSFORMER FREQUENCY NEVER CHANGE.

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