Workshop Technology
If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be

26 mm/m
20 mm/m
10 mm/m
16 mm/m

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Workshop Technology
The purpose of a gate is to

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

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