Engineering Materials
In spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated up to the lower critical temperature and then cooled in still air
None of these
Heated below the lower critical temperature and then cooled slowly

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Engineering Materials
Ductile cast iron

Is produced by annealing process. It is soft, tough and easily machined metal
Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

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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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