Engineering Materials
Pick up wrong statement about wrought iron

It melts at 1535°C
It is very soft and ductile
It contains carbon of the order of 0 to 0.25%
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling

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Engineering Materials
Thermoplastic materials are those materials which

Do not become hard with the application of heat and pressure and no chemical change occurs
Are flexible and can withstand considerable wear under suitable conditions
Are used as a friction lining for clutches and brakes
Are formed into shape under heat and pressure and results in a permanently hard product

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Engineering Materials
Stress relaxation is the phenomenon

In which stress remains constant on increasing load
In which parts are not loaded
Stress reduces on increasing load
In which deformation tends to loosen the joint and produces a stress reduced

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