Question

Which of the following is not a core sand property?

(a) Dry strength

(b) Hardness

(c) Low collapsibility

(d) Good Permeability

The question was posed to me during a job interview.

This intriguing question comes from Indian Sand and core sand topic in chapter Molding and Core Sands of Casting-Forming-Welding I

Answer 1

Right answer is (c) Low collapsibility

The best explanation: Dry strength, hardness and a good amount of permeability are a few properties of core sand. Low collapsibility is not any of the property of core sands, in fact, core sands are supposed to have high collapsibility.