The purpose of a riser is to

The purpose of a riser is to Correct Answer Feed the molten metal to the casting in order to compensate for the shrinkage

A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.
Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.
Bissoy MCQ

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