What is core type transformer ?

Constructionally there are rwo types of transformers i.e. Core type transformer and Shell type transformer. There are differ from each other by the manner in which the winding are wound around the magnetic core.
Core type transformer- in Core type transformers , the windings surround a considerable part of the core, i.e. The half turns of primary and secondary windings are placed on each limb (core).
Generally, circular coils are used in core transformer because of their mechanical strengh. Such cylindrical coil are wound in helical layer with the different layers insulated from each other by paper, cloth, micarta board or cooling ducts. Figure shows the diagram of Core type transformer.