Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

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Engineering Materials
Pick up wrong statement about wrought iron

It is very soft and ductile
It contains carbon of the order of 0 to 0.25%
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
It melts at 1535°C

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

Brittle fracture is always preceded by noise
Cup and cone formation is characteristic for brittle materials
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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