Engineering Materials
Chilled cast iron has

Graphite as its basic constituent of composition
A very high percentage of graphite
A low percentage of graphite
No graphite

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

The converter must be titled to remove the contents of the converter
The brown smoke does not occur during the operation of a Bessemer converter
Silicon and manganese has burnt and carbon has started oxidizing
Air is burning out silicon and manganese

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Engineering Materials
Free carbon in iron makes the metal

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