Question

______________ is the most commonly used deoxidizer used in foundry.

(a) Tungsten

(b) Molybdenum

(c) Silicon

(d) Titanium

I got this question in an internship interview.

Origin of the question is Materials used for Patterns topic in section Casting Processes of Foundry and Forging

Answer 1

Correct choice is (c) Silicon

To explain I would say: Silicon is used in the form of Silicon dioxide as it has the ability to resist oxidation in steel. Hence it is termed as the best deoxidizer.