Question

Skin dried mould is preferable for large moulds over the dray sand moulds.

(a) True

(b) False

I have been asked this question in semester exam.

Question is from Types of Sand Moulds in division Pattern Materials & Moulding Sand Tests of Foundry and Forging

Answer 1

Correct choice is (a) True

Easy explanation: Though the dry sand mould is preferable for large moulds because of the expense involved, the compromise is achieved by drying only the skin of the mould cavity with which the molten metal comes into contact, instead if the full mould.