Polymer Technology

201. 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

Correct answer: (A)
5°C and 1 kgf/cm2

202. Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene 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

Correct answer: (A)
50°C and 3 - 4 kg/cm2

203. Temperature maintained in the emulsion polymerisation reactor for PVC manufacture is about _________ ° C.

  1. -20
  2. 50
  3. 250
  4. 500

Correct answer: (B)
50

204. Terylene is

  1. Same as Dacron
  2. A polyester
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) & (B)

205. Terylene is a/an

  1. Addition polymer
  2. Poly amide
  3. Homopolymer
  4. None of these

Correct answer: (D)
None of these

206. The conversion of caprolactam in the above case is about _________ percent.

  1. 25
  2. 50
  3. 70
  4. 90

Correct answer: (D)
90

207. The generic chemical name for the class of polymers which are commercially known as nylons is

  1. Polyolefins
  2. Polyamide
  3. Polyacrylate
  4. Polyurethane

Correct answer: (B)
Polyamide

208. The inter particle forces between linear chains in nylon-66 are _________ bonds.

  1. Hydrogen
  2. Covalent
  3. Ionic
  4. None of these

Correct answer: (A)
Hydrogen

209. The main use of butadiene is

  1. As a plasticiser for unsaturated polyester
  2. In the manufacture of synthetic rubber
  3. As an anti-skimming agent in paint
  4. None of these

Correct answer: (B)
In the manufacture of synthetic rubber

210. The major component of acrylic fibres is

  1. Polyamides
  2. Polyolefins
  3. Polyacrylonitrile
  4. Polyesters

Correct answer: (C)
Polyacrylonitrile

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