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Engineering Materials

Engineering Materials
The percentage of carbon in grey iron castings usually varies between

0.5 to 1%
5 to 7%
2.5 to 4.5%
0.012

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Engineering Materials
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

In still air
Slowly in the furnace
Suddenly in a suitable cooling medium
Any one of these

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Engineering Materials
Wrought iron

Is a ductile material
All of these
Can be easily forged or welded
Cannot stand sudden and excessive shocks

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

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

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Engineering Materials
The lower critical temperature

Increases as the carbon content in steel increases
Is same for all steels
Decreases as the carbon content in steel increases
Depends upon the rate of heating

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Engineering Materials
The purpose of heat treatment is to

Any one of these
Modify the structure of the material
Change grain size
Relieve the stresses set up in the material after hot or cold working

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