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
In which stress remains constant on increasing load
Stress reduces on increasing load

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Engineering Materials
Carbon steel is

Made by adding carbon in steel
Extensively used for making cutting tools
An alloy of iron and carbon with varying quantities of phosphorus and sulphur
Refined from cast iron

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Engineering Materials
Which of the following statement is true about brittle fracture?

Cup and cone formation is characteristic for brittle materials
Brittle fracture is always preceded by noise
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
High temperature and low strain rates favour brittle fracture

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