chemical engineering polymer technology MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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
241. Elastomers are__________________?
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A. Having high flexural strength

B. Exemplified by protein derivatives

C. Having very high tensile strength and heat resistance

D. Thermosetting material

242. Pick out the wrong statement?
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A. Nylon fibres have greater water absorption capacity than polyester fibres

B. Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning

C. Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre

D. Crimp is a measure of the difference between the length of the straightened and unstraightened fibre

243. Density of low density polythene is about ____________ gm/c.c?
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A. 0.56

B. 0.38

C. 0.81

D. 0.91
244. The repeating units of PTFE are___________________?
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A. FClC = CF2

B. F3 C-CF3

C. Cl2CH-CH3

D. F2 C = CF2
245. The process involved in converting rubber into a thin sheet or coating it on fabric is called__________________?
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A. Calendaring

B. Extrusion

C. Mastication

D. Vulcanisation

246. Linear polymers are normally_________________?
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A. Having extremely high softening point

B. Thermoplastic

C. Elastometric

D. Thermosetting

247. Polyurethane cannot be used to make____________________?
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A. Fibre reinforced plastic (FRP)

B. Thermal insulation in refrigerator

C. Automobile cushion

D. Coating and adhesive

248. Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is __________________?
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A. Nylon-66

B. Teflon

C. Polyester

D. Bakelite

249. Bakelite (phenol-formaldehyde) resin cannot be used as________________?
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A. Decorative paint

B. Electrical insulation

C. Decorative laminates

D. Glass reinforced plastics

250. Vulcanisation of rubber_____________________?
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A. Increases its ozone & oxygen reactivity

B. Converts its plasticity into elasticity

C. Increases its oil & solvent resistance

D. Decreases its tensile strength

251. In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ?
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A. Polycaprolactam

B. PTFE

C. PMMA

D. Buna-S
252. All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it cannot be used for the production of plastic_______________?
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A. Tubings

B. Filaments

C. Buckets

D. Pipes

253. ________________ is produced by polymerisation of chloroprene?
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A. Polyurethane rubber

B. Thiokol (a polysulphide rubber)

C. Butyl rubber

D. Neoprene
254. Nylon-66 is manufactured from ____________________?
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A. Maleic anhydride and Hexamethylene diamine

B. Adipic acid and Hexamethylene diamine

C. Dimethyl terephthalate (DMT) and ethylene glycol

D. Caprolactam

255. _____________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate?
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A. Rubbery

B. Hard

C. Fibrous

D. Leathery
256. Which of the following is not a condensation polymer ?
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A. Bakelite

B. None of these

C. Poly-methyl-methacrylate (PMMA)

D. Melamine polymer

257. Neoprene is chemically known as _________________?
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A. Polybutadiene

B. Poly chloroprene

C. Polyurethane

D. Styrene butadiene rubber (SBR)

258. _____________ is a homopolymer?
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A. Terylene

B. Nylon-66

C. Neoprene

D. Bakelite

259. Polycondensation reaction of polymerisation ___________________?
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A. Produces only thermoplastic material

B. Does not need any catalyst

C. Produces epoxy polymers

D. Does not produce linear polymers

260. Phenol formaldehyde is produced by condensation polymerisation. It is also known as_________________?
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A. Polyester

B. Nylon-66

C. Bakelite

D. Teflon