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

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

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Workshop Technology
The purpose of a gate is to

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

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Workshop Technology
Piercing is an operation of cutting

A cylindrical hole in a sheet of metal by the punch and the die
A flat sheet to the desired shape
A number of holes evenly spaced in a regular pattern on a sheet of metal
A hole (other than cylindrical) in a sheet of metal by the punch and the die

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