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Engineering Materials

Engineering Materials
Super conduction by metals is observed in the temperature range of

Around 0°C
Below 10°K
Around 100°C
Above 100°K

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Engineering Materials
Sulphur in cast iron

Aids fusibility and fluidity
Make the iron white and hard
Makes the iron soft and easily machinable
Increases hardness and brittleness

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Engineering Materials
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Heat treatment
Precipitation
Allotropic change
Recrystallization

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Engineering Materials
The strength is the ability of a material to resist

Externally applied forces with breakdown or yielding
Fracture due to high impact loads
Deformation under stress
None of these

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Engineering Materials
Addition of copper to aluminium results in

Improving machinability
Improvement of casting characteristics
Improvement of corrosion resistance
One of the best known age and precipitation hardening systems

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Engineering Materials
Recrystallization temperature can be lowered by

Working at lower temperature
All of these
Grain refinement
Purification of metal

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