Engineering Materials
The unit cells

Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
Have the same orientation and their similar faces are parallel
All of these

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above upper critical temperature
30° C to 50° C below lower critical temperature
30° C to 50° C above lower critical temperature
30° C to 50° C below upper critical temperature

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Engineering Materials
Stress relaxation is the phenomenon

In which parts are not loaded
In which deformation tends to loosen the joint and produces a stress reduced
Stress reduces on increasing load
In which stress remains constant on increasing load

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