Polymer Extrusion Technology - Set 12 - ObjectiveBooks

Polymer Extrusion Technology - Set 12

Practice Test: Question Set - 12

1. The monomer of natural rubber is
    (A) DMT
    (B) Isoprene
    (C) 2 methyl-1 propane
    (D) Both (b) and (c)

2. __________ polymer is produced by the copolymerization of vinyl chloride-vinyl acetate.
    (A) Fibrous
    (B) Leathery
    (C) Rubbery
    (D) Hard

3. Cellulose is the main constituent of most __________ fibres.
    (A) Acrylic
    (B) Spandex
    (C) Synthetic
    (D) Natural

4. __________ moulding is used for shaping of thermosetting plastics exclusively.
    (A) Compression
    (B) Injection
    (C) Transfer
    (D) Extrusion

5. Benzoyl chloride is not used as a catalyst in the manufacture of
    (A) Polystyrene
    (B) Polyvinyl acetate
    (C) Polypropylene
    (D) Polyvinyl chloride-co-vinyl acetate

6. Pick out the wrong statement.
    (A) Polymeric fibres are never produced by addition polymerization
    (B) Property of tackiness is exhibited by uncured rubber
    (C) Sharp melting point is not observed in thermoplastic polymers
    (D) Polythene generally has an excellent resistance to ultra violet rays

7. Visco-elastic behavior exhibited by plastics is a __________ like behavior.
    (A) Solid
    (B) Liquid
    (C) Combination of solid & liquid
    (D) Neither solid nor liquid

8. Poly Vinyl chloride (PVC) is a __________ material.
    (A) Thermoplastic
    (B) Thermosetting
    (C) Fibrous
    (D) Chemically active

9. Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerization. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerization is 800?
    (A) 50000
    (B) 51600
    (C) 49200
    (D) 50800

10. Polycaprolactam is nothing but
    (A) Orlon
    (B) Nylon-66
    (C) Nylon-6
    (D) Saran

11. __________ tubes are good substitute for human blood vessels on heart by-pass operation.
    (A) PVC
    (B) Polythene
    (C) Teflon/Dacron
    (D) Polystyrene

12. Plasticizers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticizer?
    (A) Ethylene glycol
    (B) Stearic acid estors
    (C) Tricresyl phosphate
    (D) Esters of phthalic acid

13. Vulcanization of rubber
    (A) Decreases its tensile strength
    (B) Increases its ozone & oxygen reactivity
    (C) Increases its oil & solvent resistance
    (D) Converts its plasticity into elasticity

14. Which of the following polymers shows the highest anti-tacking properties?
    (A) Melamine formaldehyde resin
    (B) Phenolic resin
    (C) Epoxy resin
    (D) Alkyd resin

15. Trade name of __________ is neoprene.
    (A) Polychlorophrene
    (B) Polyisoprene
    (C) Polytetrafluoroethylene
    (D) Poly vinyl acetate

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