Workshop Technology
The purpose of a gate is to

Delivers molten metal from pouring basin to gate
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 into the mould cavity

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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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