The efficiency at a 100 KVA
transformer is 0.98 at full as well as half load. For this transformer at full
load the copper loss
Is less then core loss
Is equal to core loss
Is more than core loss
All the above
Is more than core loss
Given
:The efficiency of transformer (at 100 KVA) = 0.98
Full
load efficiency 
Half load efficiency 
Let,
power factor (Pf = 1)
We know that,
(Copper loss at half load 
= time of Copper loss at
full load)
On
comparing equation (i) and (ii), we get
Hence,
the correct option is (C).
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