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  • Question
  • 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

  • Correct Answer
  • both a & b 


  • Polymer Technology problems


    Search Results


    • 1. Spray test determines the __________ of refractories.

    • Options
    • A. resistance to slag penetration
    • B. resistance to CO attack
    • C. RUL
    • D. permanent linear change
    • Discuss
    • 2. Magnesite bricks are used in those parts of furnaces, which are

    • Options
    • A. subjected to temperature fluctuation.
    • B. required to resist corrosive basic slag.
    • C. subjected to high load.
    • D. none of these.
    • Discuss
    • 3. With increase in the porosity, thermal spalling resistance of fireclay brick

    • Options
    • A. increases
    • B. decreases
    • C. remains same
    • D. may increase or decrease
    • Discuss
    • 4. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

    • Options
    • A. cost
    • B. electrical conductivity
    • C. thermal conductivity
    • D. fusion point
    • Discuss
    • 5. Resistance to slag attack of a refractory

    • Options
    • A. depends on the nature of slag & refractory.
    • B. decreases at higher temperature.
    • C. decreases, if defective joints & cracks exist in the refractory.
    • D. all (a), (b) and (c).
    • Discuss
    • 6. Transistor parts and refrigerator components are normally made of

    • Options
    • A. polystyrene
    • B. polyester
    • C. high density polythene
    • D. polyurathane
    • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. Automobile steering wheels are normally made of

    • Options
    • A. cellulose acetate
    • B. cellulose nitrate
    • C. PVC
    • D. high density polythene
    • Discuss


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