Related Questions

Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
A Acrylic
B Polyester
C Nylon 6:6
D Polypropylene
The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.
A Greater than
B Lower than
C Is same as
D Half
Which of the following is not a condensation polymer?
A Bakelite
B Melamine polymer
C Polymethylmethacrylate (PMMA)
D None of these
In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for __________ fibres.
A Polythene
B PVC
C Rayon
D Polyvinyl acetate
Terylene is a condensation polymer of ethylene glycol and which acid?
A Benzoic Acid
B Salicylic acid
C Phthalic acid
D Terephthalic acid
The polymer obtained by the condensation of hexamethylene diamine and adipic acid is :
A Nylon 66
B Terylene
C Tollen's
D Bakelite
In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer?
A Bakelite (phenol formaldehyde)
B Polyester
C Polythene
D Nylon-6
Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.
A Resorcinol
B Phenol
C Para-cresol
D Melamine
Condensation polymerisation of __________ produces bakelite.
A Propylene
B Phenol & formaldehyde
C Phenol & acetaldehyde
D Urea & formaldehyde
Film condensation is promoted on a/an __________ surface.
A Oily
B Coated
C Clean & smooth
D Dirty

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