Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

Hypereutectic cast irons
Hypoeutectic cast irons
None of these
Eutectic cast irons

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

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
Silicon and manganese has burnt and carbon has started oxidizing

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