Transformers
Cores of large transformers are built upto nearly circular cross section in order to reduce

Iron losses
Eddy current loss
Leakage reactance
Copper loss

ANSWER DOWNLOAD EXAMIANS APP

Transformers
An ideal transformer is one which has

no losses and magnetic leakage
a common core for its primary and secondary windings
interleaved primary and secondary windings
core of stainless steel and winding of pure copper metal

ANSWER DOWNLOAD EXAMIANS APP