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- Question
Low pressure Zeigler process of polythene manufacture
Options- A. employs a pressure of 30 kgf/cm2.
- B. achieves an yield of 95-98% based on ethylene.
- C. produces very low density polythene.
- D. does not use any catalyst for polymerisation.
- Correct Answer
- achieves an yield of 95-98% based on ethylene.
- 1. Main constituent of cotton fibre is
Options- A. lignin
- B. cellulose
- C. starch
- D. gelatine Discuss
- 2. Polyurathane can not be used for making
Options- A. mattresses & foam
- B. coating material
- C. adhesives
- D. bottles Discuss
- 3. Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent.
Options- A. 50
- B. 75
- C. 90
- D. 99 Discuss
- 4. Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) are
Options- A. 50°C and 3 - 4 kg/cm2
- B. 50°C and 1 kgf/cm2
- C. 250°C and 10 kgf/cm2
- D. 250°C and 1 kgf/cm2 Discuss
- 5. The physical state in which polymers exist is
Options- A. melts & rubber like state.
- B. amorphous glassy state.
- C. partially crystalline state.
- D. all (a), (b) and (c). Discuss
- 6. Viscose rayon is
Options- A. cellulose nitrate
- B. regenerated cellulose nitrate
- C. regenerated cellulose acetate
- D. none of these Discuss
- 7. Molecular weight of polymers are in the range of
Options- A. 10 to 103
- B. 102-107
- C. 107-109
- D. 109-1011 Discuss
- 8. Diphenylamine is added to rubber to
Options- A. valcanise it.
- B. protect it from deterioration on exposure to air.
- C. make it non-inflammable.
- D. make it thermosetting. Discuss
- 9. Buna-S is also called
Options- A. polyurathane
- B. SBR
- C. teflon
- D. bakelite Discuss
- 10. Thermoplastic resins usually
Options- A. remain hard as long as they are hot.
- B. can not be reclaimed from waste.
- C. permanent setting resins.
- D. less brittle than thermosetting resins. Discuss
Polymer Technology problems
Search Results
Correct Answer: cellulose
Correct Answer: bottles
Correct Answer: 90
Correct Answer: 50°C and 3 - 4 kg/cm2
Correct Answer: all (a), (b) and (c).
Correct Answer: none of these
Correct Answer: 102-107
Correct Answer: protect it from deterioration on exposure to air.
Correct Answer: SBR
Correct Answer: less brittle than thermosetting resins.
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