what is the difference between core and shell type transformer ?

S.No	Core type transformer	Shell type transformer
1	Core is surrounded by winding	Winding is surrounded bycore
2	It has two limbs	It has three limbs
3	It is made up of two L shaped strips	It is made up of E and I shaped strips
4	Easy to dismantle the windings for repair work	Difficult to dismantle the windings for repair work
5	Better heat dissipation	Poor heat dissipation as the winding is surrounded by core.