Engineering Materials
Free carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Hard and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives a coarse grained crystalline structure

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Engineering Materials
Smelting is the process of

Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
All of these
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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Engineering Materials
In spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
None of these
Heated below the lower critical temperature and then cooled slowly
Heated up to the lower critical temperature and then cooled in still air

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