Engineering Materials
Steel contains

Elements like phosphorus, sulphur and silicon in varying quantities
80% or more iron
50% or more iron
Alloying elements like chromium, tungsten nickel and copper

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Engineering Materials
Free carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure

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Engineering Materials
Specify the sequence correctly

Grain growth, recrystallization, stress relief
Stress relief, grain growth, recrystallization
Grain growth, stress relief, recrystallization
Stress relief, recrystallization, grain growth

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Engineering Materials
The charge of the blast furnace consists of

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

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