Engineering Materials
Which is false statement about properties of aluminium?

Wear resistance is very good
Modulus of elasticity is fairly low
Creep strength limits its use to fairly low temperatures
Fatigue strength is not high

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Engineering Materials
Recrystallization temperature is one

At which crystals first start forming from molten metal when it is cooled
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
At which crystals grow bigger in size
At which change of allotropic form takes place

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Engineering Materials
Amorphous material is one

Which is not attacked by phosphorous
Which emits fumes on melting
In which atoms align themselves in a geometric pattern upon solidification
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

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

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