37751. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.
37752. 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.
37753. Identify the group in which all the polymers mentioned can be used to make fibres.
37754. Molecular weights of plastics ranges from
37755. Non sulphonated hard bakelites are not used for making
37756. Value of one kilowatt-hour is
37757. Epoxy resin is
37758. Polymerisation process in which two or more monomers of chemically different nature take part is called
37759. Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?
37760. Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance.
37761. Which of the following types of polymers has the strongest inter particle forces ?
37762. A copolymer of vinyl and vinylidine chloride is called
37763. The major component of acrylic fibres is
37764. Which of the following polymers is used for making a non stick coating on frying pans ?
37765. Which of the following polymers does not belong to the class of polyacrylate polymer ?
37766. Tyres are made by
37767. Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its
37768. One Farad is equal to
37769. The depolarizer is used in dry cell is
37770. Polythene is a/an
37771. Synthetic polymer produced by using terephthalic acid and ethylene glycol is
37772. Catalyst used in the production of high density polythene by low pressure Ziegler process is
37773. Thermosetting polymers as compared to thermoplastic polymers
37774. The monomer of natural rubber is
37775. 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.
37776. Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces
37777. Two batteries each of open circuit voltage 2 v and internal resistance of 2 Ohm ,the current supplied by the battery is
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