Question

Refractoriness required in the core should be lower than that required in the moulding sand.

(a) True

(b) False

This question was addressed to me during an online interview.

Enquiry is from Forces Acting on Cores and Mold in chapter Mold and Mold Making of Casting-Forming-Welding I

Answer 1

Right answer is (b) False

The best I can explain: Thermal load experienced by the core is much greater than that of experienced by the mould walls. So it is required that the core is able to bear the mechanical loading as well as the thermal loading. So, refractoriness required in the core should be higher than that required in the moulding sand.