Workshop Technology
The directional solidification in casting can be improved by using

Chills and padding
Chills, chaplets and padding
Chills and chaplets
Chaplets and padding

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Workshop Technology
Notching is the operation of

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

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Workshop Technology
The purpose of a gate is to

Delivers molten metal from pouring basin to gate
Delivers molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage
Act as a reservoir for the molten metal

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