Engineering Materials
The machinability of steel is increased by

Silicon and sulphur
Phosphorous and aluminium
Sulphur, graphite and aluminium
Phosphorous, lead and sulphur

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Engineering Materials
Smelting is the process of

All of these
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
Removing the impurities like clay, sand etc. from the iron ore by washing with water

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