Compare core type and shell type transformer on any four parameters.
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Core type
Shell type
It has one window
It has two windows
It has one magnetic circuit. 
It has two magnetic circuits. 
Core surrounds the winding. 
Winding surrounds the core
The average length of the core is more.
The average length of the core is less.
Area of cross-section is less so more turns are required.
Area of the cross section is more so less turns are required.
Better cooling for winding
Better cooling for core 
Mechnical strength is less
Mechnical strength is high
Repair and maintenance is easy
Repair and maintenance is difficult
Application: Low current, high voltage
Application: High current, low voltage
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