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.Management Sciences
Category: Polymer Technology
All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it cannot be used for the production of plastic_______________?
A. Filaments
B. Pipes
C. Buckets
D. Tubings
Synthetic rubber___________________?
A. Deforms, if stretched to double of its original dimension
B. Is brittle at low temperature
C. Is softer at higher temperature
D. Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases
Nitrile rubber is produced by the polymerisation of_________________?
A. Acrylonitrile & butadiene
B. Acrylonitrile & styrene
C. Isobutylene & isoprene
D. None of these
In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher ___________________?
A. Densities
B. Melting point
C. Tensile strength
D. Hardness, rigidity & brittleness
Plasticisers are added to synthetic plastics to ________________?
A. Impart flexibility
B. Improve workability during fabrication
C. Develop new improved properties not present in the original resin
D. All A., B. and C.
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their________________?
A. Molecular sizes
B. Magnitude of intermolecular forces
C. Resistance to heat
D. Polymerisation mechanism
Answer: Option B
Polyurethane cannot be used to make____________________?
A. Automobile cushion
B. Thermal insulation in refrigerator
C. Coating and adhesive
D. Fibre reinforced plastic (FRP)
Zeigler – Natta catalyst (AlR3 – AlCl3) is used in the polymerisation of_________________?
A. Vinyl acetate
B. Vinyl chloride
C. Propylene
D. Styrene
In a co-polymer, the repeating units contain two different monomers. Which of the following is a copolymer ?
A. PTFE
B. Buna-S
C. PMMA
D. Polycaprolactam
Paper like thin plastic articles can be produced by_________________?
A. Blow moulding
B. Vacuum thermo forming
C. Injection moulding
D. None of these
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