Engineering Materials
Points of arrest for iron correspond to

Stages at which further heating does not increase temperature for some time
Stages at which allotropic forms change
Stages at which properties do not change with increase in temperature
There is nothing like points of arrest

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

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

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