Engineering Materials
When low carbon steel is heated up to lower critical temperature

The average grain size is a minimum
The grain size first increases and then decreases very rapidly
There is no change in grain size
The grain size increases very rapidly

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Engineering Materials
Free carbon in iron makes the metal

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

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