Engineering Materials
In spheroidising process, the steel is

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

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Engineering Materials
The charge of the blast furnace consists of

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

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