Workshop Technology
Cores are used to

Improve mould surface
Form internal cavities in the casting
Form a part of a green sand mould
All of these

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Workshop Technology
Notching is the operation of

Cutting a sheet of metal through part of its length and then bending the cut portion
Removal of metal to the desired shape from the edge of a plate
Cutting a sheet of metal in a straight line along the length
Bending a sheet of metal along a curved axis

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