Engineering Materials
A material is said to be allotropic, if it has

Any one of the above
Atoms distributed in random pattern
Different crystal structures at different temperatures
Fixed structure at all temperatures

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Engineering Materials
A coarse grained steel

Is less tough and has a greater tendency to distort during heat treatment
Is more ductile and has a less tendency to distort during heat treatment
Is more ductile and has a greater tendency to distort during heat treatment
Is less tough and has a less tendency to distort during heat treatment

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