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What is a function of a riser in a sand casting?(a) Provide good mobility to the molten metal(b) Prevent cavities due to shrinkage(c) To develop holes or hollow cavities in the casting(d) To provide differential cooling rates in specific areas of the casting |
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Answer» The correct choice is (b) Prevent cavities due to shrinkage Explanation: The risers also known as feeders are used to decrease the phenomena of shrinkage during solidification of the molten metal. |
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