Engineering Materials
Induction hardening is the process of

Heating and cooling rapidly
Inducing hardness by continuous process
Hardening surface of work-piece to obtain hard and wear resistant surface
Increasing hardness throughout

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Engineering Materials
The charge of the blast furnace consists of

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

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