Workshop Technology
In a centrifugal casting method

Core is made of ferrous metal
No core is used
Core is made of sand
Core is made of nonferrous metal

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Workshop Technology
The purpose of a riser is to

Act as a reservoir for the molten metal
Deliver molten metal into the mould cavity
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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