Workshop Technology
In a ___ two or more operations are performed simultaneously at the single stroke of the ram.

Progressive die
Compound die
Combination die
Simple die

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Workshop Technology
The purpose of a riser is to

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

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