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Engineering Materials

Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Hastelloy
Silver metal
Duralumin
Invar

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Engineering Materials
The hardness of steel primarily depends on

Heat treatment employed
Shape of carbides and their distribution in iron
Percentage of alloying elements
Percentage of carbon

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Engineering Materials
Tungsten when added to steel __________ the critical temperature.

Lowers
None of these
Does not effect
Raises

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Engineering Materials
Weld decay is the phenomenon found with

Nonferrous materials
Cast iron
Mild steel
Stainless steel

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Engineering Materials
Silicon when added to copper improves

Machinability
Hardness and strength
Hardness
Strength and ductility

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Engineering Materials
Recrystallization temperature can be lowered by

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

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