Textile Gate solved Papers Part-III | Tf_Gate 1992

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  • Example of seed fibers is cotton and Kapok

  • A cross-section of NaOH swollen cotton fibers shows a ring in the secondary wall which is better known as Lumen.

  • The hollow Space in cotton fiber is known as Lumen while that in wool is called Medulla.

  • The sulfur-containing amino acids in wool are cysteine and methionine.

  • Stem fibers are also known as Bast Fibers

  • Linen is made up of individual cells named Ultimate

  • The monomers used in the production of PET are MEG and TDA

  • Acrylics that contain less than 85% of acrylonitrile by weight are termed.

  • Ziegler–Natta is the catalyst used during the polymerization of polypropylene.

  • Asbestos is a naturally occurring mineral fiber.

  • The dilute solution viscosity of a branched polymer is Higher than that of the corresponding linear polymer in the same solvent.

  • Anionic polymerization produces a Low molecular weight distribution in the polymer.

  • A monomer capable of forming a six-membered ring undergoes a Side reaction.

  • A cross-linked polymer has a high molecular weight.

  • A redox indicator is most suitable for Suspension or Aqueous dispersion Polymerization.

  • Benzylamine can act as a Stabilizer in polyethylene terephthalate manufacture.

  • The degree of crystallinity can be best determined by the X-ray Diffraction technique.

  • Besides melt spinning nylon 6 fiber may also be produced by the wet spinning method.

  • Differential thermal analysis can be used for obtaining Tg, Tc, Tm of a polymer.

  • Azoic colors can be prepared on the substrate.

  • Reactive dyes form a Covalent bond with the fiber.

  • Indigo is a Vat dye.

  • Pigments are applied along with an Emulsion.

  • Acrylic fibers are dyed with Cationic dyes.

  • Rapidogen colors are a mixture of a diazoamino base and a Sodium Naphthol.

  • A low-temperature catalyst for curing pigment colors is MgCl2

  • Steaming of printed polyester fabrics is carried out in a loop ager at 100-200oC.

  • Carbonization treatment is given to printed polyester/viscose rayon fabric to dissolve Cellulosic material.

True or False.

  • Cellulose acetate can be melt spun False

  • Wool dissolves in sulphuric acid False

  • Cotton behaves as a cross-linked polymer True

  • A copolymer has a lower melting temperature than that of the respective homopolymers. False

  • Variation in relative humidity of air has no effect on the tensile characteristics of the fiber. False

  • The displacement of an absorption band towards a longer wavelength is called redshift. True

  • The colors that are on the textile fabrics are due to subtractive color mixing. False

  • Optical density is the same as absorbance. False

  • The visible region is from 300nm to 700nm. False

  • The lightfastness is assessed with the help of a greyscale. False

  • A diazonium compound couples with phenol at m-position. False

  • Hydroxyl and amino groups do not influence the color and dyeing properties of azo dyes. False

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