Workshop Technology
The purpose of a gate is to

Act as a reservoir for the molten metal
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

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Workshop Technology
In a hot chamber die casting machine

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

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Workshop Technology
In permanent mould casting method

None of these
Molten metal is forced into mould under high pressure
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
Molten metal is poured and allowed to solidify while the mould is revolving

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