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Engineering Materials

Engineering Materials
Iron ore is usually found in the form of

Carbonates
All of these
Oxides
Sulphides

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Engineering Materials
Sulphur in steel

Lowers the toughness and transverse ductility
Acts as deoxidiser
Reduces the grain size
Decreases tensile strength and hardness

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Engineering Materials
Weld decay is the phenomenon found with

Nonferrous materials
Cast iron
Stainless steel
Mild steel

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Engineering Materials
Recrystallization temperature can be lowered by

Grain refinement
All of these
Purification of metal
Working at lower temperature

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Engineering Materials
The alloy used for making electrical resistances and heating elements is

Elinvar
Nichrome
Magnin
Invar

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Engineering Materials
The machinability of steel is increased by

Silicon and sulphur
Phosphorous and aluminium
Phosphorous, lead and sulphur
Sulphur, graphite and aluminium

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