Workshop Technology
In permanent mould casting method

Molten metal is forced into mould under high pressure
Molten metal is poured and allowed to solidify while the mould is revolving
None of these
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition

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Workshop Technology
The purpose of a gate is to

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

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Workshop Technology
Piercing is an operation of cutting

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

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Workshop Technology
In a hot chamber die casting machine

Nonferrous alloys with low melting temperature are casted
Ferrous alloys with high melting temperature are casted
Nonferrous alloys with high melting temperature are casted
Ferrous alloys with low melting temperature are casted

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