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

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

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Workshop Technology
The purpose of a riser is to

Deliver 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
Deliver the molten metal from pouring basin to gate

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