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Engineering Materials

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

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

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Engineering Materials
Which of the following is an amorphous material?

Silver
Glass
Lead
Mica

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Engineering Materials
Age-hardening is related with

Duralumin
Stainless steel
German silver
Gun metal

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Engineering Materials
The machinability of steel is improved by adding

Sulphur, lead and phosphorus
Nickel
Chromium
Nickel and chromium

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Engineering Materials
Which is the false statement about wrought iron? It has

Uniform strength in all directions
High resistance to rusting and corrosion
High ductility
Ability of hold protective coating

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Engineering Materials
When low carbon steel is heated up to lower critical temperature

The average grain size is a minimum
The grain size first increases and then decreases very rapidly
There is no change in grain size
The grain size increases very rapidly

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