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Chemical Engineering :: Polymer Technology

  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 ?

  2. A.
    Ammonium alum
    B.
    Potassium alum
    C.
    both a & b
    D.
    neither a nor b

  3. Automobile steering wheels are normally made of

  4. A.
    cellulose acetate
    B.
    cellulose nitrate
    C.
    PVC
    D.
    high density polythene

  5. In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?

  6. A.
    Bakelite (phenol formaldehyde)
    B.
    Polyester
    C.
    Polythene
    D.
    Nylon-6

  7. 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.

  8. A.
    -5
    B.
    10-30
    C.
    250-280
    D.
    500-600

  9. Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.

  10. A.
    1-1000
    B.
    1000-1500
    C.
    1500-2000
    D.
    2000-2500

  11. Which of the following low molecular weight (<104 ), soft & waxy polymer is used in chewing gum ?

  12. A.
    Cellulose acetate
    B.
    Polyvinyl acetate
    C.
    Thiokol
    D.
    PVC

  13. Buna-S is a __________ material.

  14. A.
    fibrous
    B.
    plastic
    C.
    resinous
    D.
    rubbery

  15. Zeigler - Natta catalyst (AlR3 - AlCl3) is used in the polymerisation of

  16. A.
    vinyl acetate
    B.
    vinyl chloride
    C.
    propylene
    D.
    styrene

  17. Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of

  18. A.
    cold SBR
    B.
    butyl rubber
    C.
    Bunai N
    D.
    Buna S

  19. Neoprene is a

  20. A.
    monomer
    B.
    synthetic rubber
    C.
    polyester
    D.
    none of these