Question

In permanent mould casting method, metallic cores are mainly used instead of sand cores.

(a) True

(b) False

I have been asked this question in class test.

Origin of the question is Casting Techniques in division Casting Process of Casting-Forming-Welding II

Answer 1

Correct answer is (b) False

To explain: In permanent mould casting technique, metallic cores are not used generally because the metallic cores cannot be complex with undercuts in the casting process. Also, the metallic core is to be withdrawn immediately after solidification; otherwise, its extraction becomes difficult due to its shrinkage in the mould. So, sand cores are mainly preferred in this method for the casting process.