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Chemical Engineering
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Polymer Technology
Comments
Question
Poly tetra flouro ethylene (PTFE) is known as
Options
A. dacron
B. teflon
C. bakelite
D. celluloid
Correct Answer
teflon
Polymer Technology problems
Search Results
1. In condensation polymerisation as compared to addition polymerisation
Options
A. the monomers are unsaturated compounds.
B. no co-product is lost.
C. the monomers contain two functional groups.
D. generally only one monomer is involved
Show Answer
Scratch Pad
Discuss
Correct Answer: the monomers contain two functional groups.
2. Cellulose content in bomboo fibre is about __________ percent.
Options
A. 10
B. 20
C. 50
D. 85
Show Answer
Scratch Pad
Discuss
Correct Answer: 50
3. In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of
Options
A. cross linked polystyrene.
B. phenol formaldehyde resins.
C. polyesters.
D. polyamides.
Show Answer
Scratch Pad
Discuss
Correct Answer: cross linked polystyrene.
4. Thermosetting resins/polymers as compared to thermoplastic ones are
Options
A. soluble in all organic solvents.
B. more brittle.
C. formed by addition polymerisation only.
D. easily reshaped & reused.
Show Answer
Scratch Pad
Discuss
Correct Answer: more brittle.
5. Gutta parcha rubber is
Options
A. soft & tacky at room temperature.
B. an isomer of natural rubber.
C. a thermosetting resin.
D. recovered by coagulation of rubber latex.
Show Answer
Scratch Pad
Discuss
Correct Answer: an isomer of natural rubber.
6. The generic chemical name for the class of polymers which are commerically known as nylons is
Options
A. polyolefins
B. polyamide
C. polyacrylate
D. polyurathane
Show Answer
Scratch Pad
Discuss
Correct Answer: polyamide
7. Thermosplastic materials
Options
A. do not soften on application of heat.
B. are heavily branched molecules.
C. are solvent insoluble.
D. none of these.
Show Answer
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Discuss
Correct Answer: none of these.
8. Properties of a polymer is affected by the
Options
A. chain length.
B. intermolecular forces.
C. branching & cross-linking.
D. all (a), (b).
Show Answer
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Discuss
Correct Answer: all (a), (b).
9. Vulcanisation of rubber does not increase its
Options
A. elasticity
B. plasticity
C. ductility
D. none of these
Show Answer
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Discuss
Correct Answer: plasticity
10. Synthetic rubber
Options
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.
Show Answer
Scratch Pad
Discuss
Correct Answer: is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases.
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