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MCQs

Total Questions : 1113 | Page 18 of 112 pages
Question 171. Orlan fibre which is used as a wool sub stitute is
  1.    An amorphous polymer
  2.    A natural polymeric fibre
  3.    Polyacrylonitrile
  4.    Polymethylmethacrylate (PMMA)
 Discuss Question
Answer: Option C. -> Polyacrylonitrile
Question 172. Size range of polymer molecules varies from __________ metre.
  1.    10⁻² to 10⁻⁵
  2.    10⁻⁴ to 10⁻⁷
  3.    10⁻¹ to 10⁻²
  4.    10⁻⁸ to 10⁻¹⁰
 Discuss Question
Answer: Option A. -> 10⁻² to 10⁻⁵
Question 173. Zeigler - Natta catalyst (AlR₃ - AlCl₃) is used in the polymerisation of
  1.    Vinyl acetate
  2.    Vinyl chloride
  3.    Propylene
  4.    Styrene
 Discuss Question
Answer: Option C. -> Propylene
Question 174. __________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.
  1.    Fibrous
  2.    Leathery
  3.    Rubbery
  4.    Hard
 Discuss Question
Answer: Option B. -> Leathery
Question 175. A copolymer of vinyl and vinylidine chloride is called
  1.    Treylene
  2.    Orlon
  3.    Saran
  4.    Dacron
 Discuss Question
Answer: Option C. -> Saran
Question 176. Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature.
  1.    Nylon
  2.    Polyacrylonitrile
  3.    Polypropylene
  4.    Polyester
 Discuss Question
Answer: Option B. -> Polyacrylonitrile
Question 177. Styrene butadiene rubber (SBR) is never used for making
  1.    Coated fabrics
  2.    Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
  3.    Gaskets
  4.    Soles of shoes
 Discuss Question
Answer: Option B. -> Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
Question 178. Which of the following is the most important rubber compounding ingradient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness?
  1.    Phosphorous
  2.    Carbon black
  3.    Pine oil
  4.    Rosin
 Discuss Question
Answer: Option B. -> Carbon black
Question 179. Temperature and gage pressure maintained during the manufacture of cold SBR (styrene butadiene rubber) are
  1.    5°C and 1 kgf/cm²
  2.    - 20°C and 1 kgf/cm²
  3.    0°C and 1 kgf/cm²
  4.    0°C and 3 kgf/cm²
 Discuss Question
Answer: Option A. -> 5°C and 1 kgf/cm²
Question 180. Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are
  1.    50°C and 3 - 4 kg/cm²
  2.    50°C and 1 kgf/cm²
  3.    250°C and 10 kgf/cm²
  4.    250°C and 1 kgf/cm²
 Discuss Question
Answer: Option A. -> 50°C and 3 - 4 kg/cm²

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