Engineering Materials
Sulphur in steel

Acts as deoxidiser
Decreases tensile strength and hardness
Reduces the grain size
Lowers the toughness and transverse ductility

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Engineering Materials
Smelting is the process of

All of these
Removing the impurities like clay, sand etc. from the iron ore by washing with water
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
Reducing the ore with carbon in the presence of a flux

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Engineering Materials
Which of the following statement is true about brittle fracture?

Brittle fracture is always preceded by noise
Cup and cone formation is characteristic for brittle materials
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
High temperature and low strain rates favour brittle fracture

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