Engineering Materials
In spheroidising process, the steel is

Heated up to the lower critical temperature and then cooled in still air
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
None of these

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

Silicon and manganese has burnt and carbon has started oxidizing
Air is burning out silicon and manganese
The converter must be titled to remove the contents of the converter
The brown smoke does not occur during the operation of a Bessemer converter

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