Question

Rat tails and buckles in sand casting are caused by __________

(a) Lower strength of the solidified metal

(b) Lower refractoriness of the moulding sand

(c) Lower strength of the moulding sand

(d) Lower hardness of the moulding sand

I had been asked this question during a job interview.

My question is from Pattern Design topic in chapter Pattern and Pattern Making of Casting-Forming-Welding I

Answer 1

The correct choice is (c) Lower strength of the moulding sand

Explanation: Lower strength of the moulding sand causes rat tails and buckles type of defect in manufacturing of casting.