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 castingThis question was addressed to me in an interview for internship.The origin of the question is Functions of a Pattern in portion Pattern and Pattern Making of Casting-Forming-Welding I

What is a function of a riser in a sand casting?(a) Provide good mobil

1.	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 castingThis question was addressed to me in an interview for internship.The origin of the question is Functions of a Pattern in portion Pattern and Pattern Making of Casting-Forming-Welding I
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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