Engineering Materials
Stress relaxation is the phenomenon

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

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Engineering Materials
Specify the sequence correctly

Stress relief, grain growth, recrystallization
Stress relief, recrystallization, grain growth
Grain growth, recrystallization, stress relief
Grain growth, stress relief, recrystallization

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Engineering Materials
Dow metal contains

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% aluminium and 90% copper
90% magnesium and 9% aluminium with some copper

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

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