Heat Transfer - Mechanical Engineering (MCQ) questions and answers for Q. 4084

Q.  What are thermoplastics?
- Published on 05 Aug 15

a. They are nonlinear polymers, in which rise in temperature increases plasticity
b. They are linear polymers, in which rise in temperature increases plasticity
c. They are linear polymers, in which temperature rise has no effect on plasticity
d. None of the above

ANSWER: They are linear polymers, in which rise in temperature increases plasticity

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    Discussion

  • Sravanthi   -Posted on 12 Oct 15
    Thermoplastics are linear polymers in which plasticity increases as temperature rises. They have high molecular weight. Thermoplastics can be reshaped by heating and various parts are produced using various polymer processing techniques. The different polymer processing techniques are compression molding, calendering, extrusion and injection molding.
    Thermoplastic and thermosetting plastics are different. Thermoplastics are deformed and bent easily when heated such as PVC and polythene. Thermosetting plastics once moulded cannot be softened such as Bakelite and Melamine.

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