logo

CuriousTab

CuriousTab

Discussion


Home Chemical Engineering Polymer Technology Comments

  • Question
  • Thermosetting plastic materials


  • Options
  • A. can be repeatedly melted.
  • B. is useful for melt casting.
  • C. can not be melted after forming.
  • D. is useful for spinning.

  • Correct Answer
  • can not be melted after forming. 


  • Polymer Technology problems


    Search Results


    • 1. Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their

    • Options
    • A. molecular sizes.
    • B. magnitude of intermolecular forces.
    • C. resistance to heat.
    • D. polymerisation mechanism.
    • Discuss
    • 2. Nylon-66 is a polyamide of

    • Options
    • A. hexamethylene diamine and adipic acid.
    • B. adipic acid and methyl amine.
    • C. vinyl chloride and formaldeyde.
    • D. none of these.
    • Discuss
    • 3. Which of the following is not a natural fibre?

    • Options
    • A. Silk
    • B. Viscose rayon
    • C. Wool
    • D. Cotton
    • Discuss
    • 4. Styrene butadiene rubber (SBR) is

    • Options
    • A. a natural rubber.
    • B. another name of silicone rubber.
    • C. a synthetic polymer.
    • D. a synthetic monomer.
    • Discuss
    • 5. Dacron is a

    • Options
    • A. condensation polymerisation product of hexamethylene diamine and adipic acid.
    • B. condensation polymerisation product of dimethyl terephthalate (DMT) and ethylene glycol.
    • C. thermosetting material.
    • D. none of these.
    • Discuss
    • 6. Polycaprolactum is

    • Options
    • A. nylon-6
    • B. nylon-66
    • C. dacron
    • D. rayon
    • Discuss
    • 7. Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically

    • Options
    • A. polymethyl methacrylate (PMMA).
    • B. Polytetraflouroethylene(PTFE).
    • C. polycarbonates.
    • D. phenolic resins.
    • Discuss
    • 8. Polyvinyl chloride (PVC)

    • Options
    • A. is produced by polycondensation reaction.
    • B. uses either emulsion or suspension polymerisation methods.
    • C. can be made thermosetting by adding a plasticiser.
    • D. softening temperature is 200°C.
    • Discuss
    • 9. Cross linked polymers formed from bi-and trifuctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties.

    • Options
    • A. thermoplastic
    • B. thermosetting
    • C. elastometric
    • D. brittleness
    • Discuss
    • 10. Silicone is a/an

    • Options
    • A. monomer
    • B. inorganic polymer
    • C. thermoplastic material
    • D. a natural polymer
    • Discuss


    Comments

    There are no comments.

Enter a new Comment