Engineering Materials
Points of arrest for iron correspond to

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

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Engineering Materials
The charge of the blast furnace consists of

Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
Calcined ore, coke and limestone all in equal parts
Calcined ore (4 parts), coke (1 part) and limestone (8 parts)

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Engineering Materials
In spheroidising process, the steel is

Heated up to the lower critical temperature and then cooled in still air
None of these
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated below the lower critical temperature and then cooled slowly

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