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
Act as a reservoir for the molten metal
Delivers molten metal from pouring basin to gate

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Workshop Technology
For arc welding

Alternating current with low frequency is used
Direct current is used
Any one of these
Alternating current with high frequency is used

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
A hole (other than cylindrical) in a sheet of metal by the punch and the die
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

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Workshop Technology
In permanent mould casting method

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