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Engineering Materials

Engineering Materials
Drop forging dies contain carbon of the order of

0.25 to 0.5%
0.7 to 0.9%
0.1 to 0.2%
0.6 to 0.7%

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Engineering Materials
Brass contains

85 - 92% copper and rest tin with little lead and nickel
70 - 75% copper and rest tin
70% copper and 30% zinc
90% copper and 10% tin

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Engineering Materials
Dislocations in materials refer to the following type of defect

Line defect
Plane defect
Volumetric defect
Point defect

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Engineering Materials
The steel widely used for motor car crankshafts is

Nickel-chrome steel
Nickel steel
Silicon steel
Chrome steel

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

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

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Engineering Materials
Wrought iron

Is a ductile material
All of these
Can be easily forged or welded
Cannot stand sudden and excessive shocks

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