Engineering Materials
The charge of the blast furnace consists of

Calcined ore, coke and limestone all in equal parts
Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
Calcined ore (1 part), coke (8 parts) and limestone (4 parts)

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Engineering Materials
Stress relaxation is the phenomenon

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

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