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Engineering Materials

Engineering Materials
Eutectoid reaction occurs at

600°C
1493°C
723°C
1147°C

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Engineering Materials
A small percentage of boron is added to steel in order to

Increase hardenability
Increase wear resistance
Reduce machinability
Increase endurance strength

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Engineering Materials
The hardness of steel primarily depends on

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

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Engineering Materials
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?

Monel metal
Nichrome
Phosphor bronze
Babbitt metal

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Engineering Materials
The percentage of carbon in grey iron castings usually varies between

0.5 to 1%
0.012
5 to 7%
2.5 to 4.5%

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Engineering Materials
Sulphur in steel

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

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