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Polymer Technology problems


  • 1. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?

  • Options
  • A. Ammonium alum
  • B. Potassium alum
  • C. both a & b
  • D. neither a nor b
  • Discuss
  • 2. Transistor parts and refrigerator components are normally made of

  • Options
  • A. polystyrene
  • B. polyester
  • C. high density polythene
  • D. polyurathane
  • Discuss
  • 3. 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.

  • Options
  • A. -5
  • B. 10-30
  • C. 250-280
  • D. 500-600
  • Discuss
  • 4. Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to

  • Options
  • A. protect rubber goods from attack by oxygen & ozone present in the atmosphere.
  • B. reduce its viscosity to permit easier processing.
  • C. reduce the time of vulcanisation and quantity of vulcanising agent.
  • D. increase its viscosity.
  • Discuss
  • 5. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of

  • Options
  • A. cold SBR
  • B. butyl rubber
  • C. Bunai N
  • D. Buna S
  • Discuss
  • 6. Automobile steering wheels are normally made of

  • Options
  • A. cellulose acetate
  • B. cellulose nitrate
  • C. PVC
  • D. high density polythene
  • Discuss
  • 7. Orlan fibre which is used as a wool sub stitute is

  • Options
  • A. an amorphous polymer.
  • B. a natural polymeric fibre.
  • C. polyacrylonitrile.
  • D. polymethylmethacrylate (PMMA).
  • Discuss
  • 8. Visco-elastic behaviour exhibited by plastics is a __________ like behaviour.

  • Options
  • A. solid
  • B. liquid
  • C. combination of solid & liquid
  • D. neither solid nor liquid
  • Discuss
  • 9. Cellulose is the main contituent of most __________ fibres.

  • Options
  • A. acrylic
  • B. spandex
  • C. synthetic
  • D. natural
  • Discuss
  • 10. Mastication of rubber means

  • Options
  • A. its softening.
  • B. a treatment to retard its deterioration due to oxidation.
  • C. improving its curing rate.
  • D. depression of its freezing point.
  • Discuss

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