Question

Dropping of loose moulding sand or lumps is responsible for which of the following defect?

(a) Misruns

(b) Cuts

(c) Drop

(d) Fusion

This question was addressed to me by my college professor while I was bunking the class.

My question is taken from Classification of Defects & Factors Affecting Salvage of Castings topic in chapter Salvage of Defective Castings of Casting-Forming-Welding I

Answer 1

Correct option is (c) Drop

To explain: Drop defect is caused when anything including loose sand and lumps drops from the cope into the drag portion of the casting.