Polymer Technology - Study Mode

Show All Answers

[#271] 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

Correct Answer

(A) Acrylic

[#272] 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

Correct Answer

(B) PVC

[#273] Vulcanisation of raw rubber makes it

(A) Soft

(B) Less elastic

(C) Plastic

(D) Tacky

Correct Answer

(B) Less elastic

[#274] Which of the following polymers are produced by employing all bulk polymerisation, solution polymerisation & suspension polymerisation technique of addition (chain) polymerisation?

(A) PVC

(B) Bakelite

(C) PTFE

(D) Epoxy resin

Correct Answer

(A) PVC

[#275] Perspex can be used as a substitute of glass. Its monomer is

(A) Methyl methacrylate

(B) DMT

(C) Butadiene

(D) Tetrafluroethylene

Correct Answer

(A) Methyl methacrylate