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The purpose of a riser is to

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The purpose of a riser is to

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Correct Answer: Option C
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.
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3 Comments
Mehul Rabari
Mehul Rabari 8 years ago
solid shrinkage and liquid shrunkage density of liquid is less than density of solid of molten metal so during solidification material will shrink is called nehative shrinkage
Mehul Rabari
Mehul Rabari 8 years ago
solid shrinkage and liquid shrunkage
Mehul Rabari
Mehul Rabari 8 years ago
positive shrinkage allowances in the cast iron
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