Transformers
Which type of winding is used in 3phase shell-type transformer?

Cylindrical type
Rectangular type
Circular type
Sandwich type

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Transformers
An ideal transformer is one which has

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

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Transformers
The efficiency of a transformer, under heavy loads, is comparatively low because

iron loss is increased considerably
voltage drop both in primary and secondary becomes large
secondary output is much less as compared to primary input
copper loss becomes high in proportion to the output

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