chemical engineering polymer technology MCQs – Page 2

Practise multiple-choice questions from chemical engineering polymer technology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering polymer technology Mcqs
21. The rate controlling step in the manufacture of silicone rubber is the_________________?
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A. Condensation of siloxane to silicone

B. Polymer termination step

C. None of these

D. Initial hydrolysis of silicone monomer
22. Zeigler process________________?
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A. Employs very high pressure

B. Produces low density polythene

C. Produces high density polythene

D. Uses no catalyst

23. Mastication of rubber means_______________?
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A. Its softening

B. Depression of its freezing point

C. A treatment to retard its deterioration due to oxidation

D. Improving its curing rate

24. Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its_________________?
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A. Strength

B. Elasticity

C. Plasticity

D. Weathering characteristics
25. Pick out the wrong statement ?
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A. Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available

B. One important copolymer of styrene is SBR, which is widely used in the manufacture of

C. For the manufacture of styrene, the major raw materials are benzene and ethylene

D. Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis

E. omobile tyres

26. Phosphates (e.g., tricresyl, tributyl, tetrabutyl, triphenyl etc.) are added to polymers to act as __________________?
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A. Transparency improver

B. Anti-shrinkage agents

C. Plasticisers

D. Hardeners

27. Main constituent of cotton fiber is __________________?
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A. Cellulose

B. Lignin

C. Starch

D. Gelatine

28. Which of the following is an inorganic polymer ?
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A. Perspex

B. Bakelite

C. Teflon

D. Silicones
29. In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for _______________ fibres?
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A. Polythene

B. PVC

C. Rayon

D. Polyvinyl acetate

30. Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?
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A. Greater amount of heat build up heavy loading

B. All A., B. and C.

C. Poorer resistance

D. Poor tensile strength

31. Condensation polymerisation of formaldehyde with _____________ does not produce phenolic resin?
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A. Melamine

B. Para-cresol

C. Resorcinol

D. Phenol

32. The organic acid monomer in nylon-66 is __________________?
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A. Terephthalic acid

B. Adipic acid

C. Benzoic acid

D. Sebacic acid

33. Alkyd resin e.g., glyptal resin formed by Phthalic anhydride and glycerine is not used_______________?
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A. For surface coating of automobiles & air crafts

B. As plasticiser for PVC & nitrocellulose

C. For fibre making

D. For film forming materials

34. A copolymer is formed by the combination of two or more monomer molecules_________________?
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A. Of the same monomer by elimination of small molecules of water

B. With the elimination of small amount of water

C. None of these

D. In a chain without the elimination of water
35. 90% of the caprolactam is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of _____________ C?
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A. 250-280

B. 500-600

C. -5

D. 30-Oct

36. Molecular weights of plastics ranges from_______________?
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A. 109 to 1011

B. 1000 to 5000

C. 20000 to 25000

D. 5000 to 1000

37. Buna-S is a _______________ material?
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A. Plastic

B. Rubbery

C. Resinous

D. Fibrous

38. Tyres are made by___________________?
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A. Rotational moulding

B. Injection moulding

C. Extrusion

D. Compression moulding

39. 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 ?
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A. Ammonium alum

B. Potassium alum

C. Both A. & B.

D. Neither A. nor B.

40. Which of the following is not a thermoplastic material ?
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A. Polythene

B. Polystyrene

C. PVC

D. Epoxy polymer