Engineering Materials
Cementite consist of

13% ferrite and 87% cementite
13% cementite and 87% ferrite
6.67% carbon and 93.33% iron
13% carbon and 87% ferrite

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

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
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

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Engineering Materials
Pick up wrong statement about wrought iron

It is very soft and ductile
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
It contains carbon of the order of 0 to 0.25%

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