Question

Which is the most common defect caused by the risers?

(a) Blow holes

(b) Shrinkage

(c) Crush

(d) Mould Shift

I had been asked this question in homework.

I want to ask this question from Principles of Gating and Risering in division Concept of Gating and Risering of Foundry and Forging

Answer 1

Correct answer is (b) Shrinkage

To explain: The primary function of the riser (attached with the mould) is to feed metal to the solidifying casting so that shrinkage cavities are get rid of. Hence it can be seen that the common defect is shrinkage which has to be avoided.