Workshop Technology
A neutral flame is obtained by supplying

Equal volumes of oxygen and acetylene
More volume of acetylene and less volume of oxygen
More volume of oxygen and less volume of acetylene
None of the listed here

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Workshop Technology
The purpose of a gate is to

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

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