Engineering Materials
Thermoplastic materials are those materials which

Are formed into shape under heat and pressure and results in a permanently hard product
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

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Engineering Materials
Smelting is the process of

Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
Reducing the ore with carbon in the presence of a flux
Removing the impurities like clay, sand etc. from the iron ore by washing with water
All of these

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Engineering Materials
Stress relaxation is the phenomenon

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

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