Question

_____________ protects molten metal from atmosphere in the foundry.

(a) Pattern

(b) Mould

(c) Slag

(d) Refractories

This question was addressed to me during an interview for a job.

This interesting question is from Raw Materials for Foundry in portion Foundry Introduction of Foundry and Forging

Answer 1

The correct answer is (c) Slag

The explanation: The slag being the lighter part comes on to the surface of the molten metal from where it can be easily skimmed, tapped or removed before pouring the metal into the mould. Hence, the slag does not allow the metal to be in contact with the atmosphere.