Question

Coarse sand grains of the core material can improve the refractoriness of the core.

(a) True

(b) False

I got this question in an interview for internship.

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

Answer 1

The correct choice is (a) True

Easy explanation: The coarse sand grains of the core material are used so that the better refractoriness of the core can be achieved. Sometimes special binders are also used in the core making process to induce better mechanical and thermal properties in the core like hot strength which is very important because core experiences extreme thermal load.