Question

In Nobake moulding process, the chemical process of hardening of binder starts when ___________

(a) The sand is poured into the mixture

(b) The sand is taken out of the mixture

(c) The mixture is poured into the moulding flask

(d) When the molten metal is poured into the cavity

I have been asked this question in semester exam.

My doubt is from Molding Processes in division Mold and Mold Making of Casting-Forming-Welding I

Answer 1

The correct choice is (b) The sand is taken out of the mixture

The explanation is: A mixture is used to blend the sand with chemical binder. The chemical hardening starts when this sand exits the mixture.