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GATE Textile and Fiber Science Set 1

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1. The fibre which has a mineral origin is




2. The chemical that is used to convert soda cellulose to sodium cellulose xanthate in the manufacture of viscose rayon is




3. The fibre that will float on water is




4. The range of spinning speed (m/min) used in the manufacture of partially oriented polyester yarn is




5. Drawing of synthetic filament does not lead to an increase in




6. In a card, the wire point density is maximum on




7. The spinning system that does not generate false twist during spinning is




8. Most of the seed coat particles are removed in




9. An eccentric top roller in a drafting system leads to




10. The increase in traveller weight leads to an increase in




11. Dog knot is preferred to weaver's knot during creeling because it is




12. Size add-on does not depend on




13. Ball warping is mainly used in the manufacture of




14. The factor that does not influence the propelling force for moving the weft yarn on air jet loom is




15. In the context of thermal bonding of nonwoven web, the statement which is not true is




16. A 51 mm long fibre has 6 % crimp. The crimped length of the fibre in mm is approximately




17. 40 % of the mean mass per unit length




18. . Ratio of grab strength to strip strength is the highest when fabric extension (%) is




19. Bursting strength of a woven fabric with the same warp and weft yarns is the highest when the ratio of ends/cm and picks/cm is




20. Fabric abrasion resistance cannot be assessed by the loss in




21. Bleached cotton fabric was sent to a laboratory for determination of Copper Number, which is an estimate of the presence of




22. Malachite Green is an important dyestuff. The typical green colour is obtained when the dye molecule is




23. A typical curve between equilibrium dye uptake and dyeing temperature goes through a maximum. After the maximum, the dye uptake decreases because




24. The efficacy of the wash-n-wear treatment can be estimated by measuring its




25. Softener reduces the bending rigidity of fabrics by decreasing




26. The density of a given polyester filament sample is 1.38 g/cm3. Consider the density of fully crystalline polyester as 1.455 g/cm3 and that of fully amorphous polyester as 1.335 g/cm3. The percent crystallinity of the sample is ________.




27. Cleaning efficiency of the opening roller in a rotor spinning machine, having 56 mm diameter rotor, is 80 %. The yarn breaks when the trash deposition within the rotor groove crosses the threshold of 1 mg/mm. If a sliver with 0.4 % trash is fed at 7.5 g/min, the number of end breaks in 1 hr (to the nearest whole number) is ________.




28. In a projectile weaving machine the projectile travels a total distance of 250 cm at an average velocity of 25 m/s. If the time period during which it is in motion occupies half of the loom cycle, the maximum loom speed in picks per minute is ________.




29. A 225 denier viscose yarn has a breaking strength of 7.5 N. The yarn tenacity in cN/dtex is ________.




30. n an experiment, 1 g each of the mercerized and unmercerized fabric samples are separately treated in 30 ml of 0.25N barium hydroxide solution for the required time. 10 ml of these solutions are drawn and titrated against 0.1N HCl solution. The volumes of HCl consumed at the end of these titrations are m for mercerized and u for unmercerized cases. If Barium Activity Number (BAN) = [(b-m)/(b-u)]*100, where m=18 ml, u=20 ml and b is the volume of HCl consumed in the blank titration, then the BAN value for the above mercerized sample is ________.




31. A beaker contains 50 cc of an aqueous dye solution of concentration c (w/v). 25 cc of this solution is removed and replaced by 25 cc of distilled water. This process is repeated five more times. The final concentration of the solution is




32. Assume that the rate of evaporation of moisture from a wet fabric during drying process is proportional to the amount of moisture present in the fabric. If 50 % of the moisture is evaporated in the first 5 minutes then the time (min) taken to evaporate 90 % of the moisture is approximately




33. The number of neps in a carded web follows Poisson distribution with a mean of 100 per m2. The probability that there is no nep in an area of 645 cm2 is




34. A yarn of 24 mm length has a varying cross-section. The values of the cross-sectional area of yarn (mm2), measured at equal intervals of 4 mm from one end are 0.09, 0.12, 0.14, 0.15, 0.16, 0.13, 0.11 The volume of yarn (mm3) estimated by using Simpson's 1/3 rule of numerical integration is




35. Match the property from Group I with the characterization technique from Group II. Group I Group II P Spherulite size 1 Optical microscopy Q Degradation temperature 2 X-ray diffraction R Crystalline orientation 3 Differential scanning calorimetry S Melting temperature 4 Thermo gravimetric analysis




36. The winding speed (difference between bobbin speed and traveller speed) of yarn in a ring frame is 200 rev/min when bobbin diameter is 28 mm. If the bobbin diameter is increased to 35 mm, the winding speed (rev/min) would be




37. The weight of material on a roving bobbin is 2.4 kg. The roving hank is 600 tex. If delivery rate is 20 m/min, the time (min) required to build the bobbin is 180




38. The terry towel fabric is a




39. Sizing of single cotton yarn leads to an increase in




40. The strength utilization of yarn in a woven fabric is




41. Yarns Y1 and Y2 have the same strength when tested at 200 mm gauge length. If mass unevenness CV (%) of yarns Y1 and Y2 are 10 and 20 respectively, the ratio of the strength of yarns Y1 and Y2 when tested at 500 mm gauge length is




42. Consider the following Assertion [a] and Reason [r] [a] In the case of dyeing of cotton with reactive dyes, formation of hydrolyzed dye is a major problem. [r] In an alkaline medium, the reactive dye reacts with the hydroxyl groups irrespective of whether these are from cellulose or water. Determine the correctness or otherwise of the above Assertion [a] and Reason [r]




43. Consider the following Assertion [a] and Reason [r] [a] In the case of durable press finishing of cotton fabrics, while the citric acid can be used as a crosslinking agent, oxalic acid cannot be. [r] The mechanism of crosslinking requires formation of anhydride in the intermediate step. Determine the correctness or otherwise of the above Assertion [a] and Reason [r]




44. Consider the following Assertion [a] and Reason [r] [a] In the case of minimum application technique, compared to the conventional rolls of a typical padding mangle, Roberto rolls substantially reduce the wet pick up. [r] The Roberto rolls are connected to vacuum pump to facilitate removal of liquor from the fabric. Determine the correctness or otherwise of the above Assertion [a] and Reason [r]




45. Four polyester and four cotton carded slivers of the same count and mass CV of 4.16 % are drawn together keeping a draft of 8 on a breaker drawframe. Two slivers from breaker drawframe are further drawn along with the four cotton carded slivers keeping a draft of 6 on a finisher drawframe. The polyester (%) in the final sliver is approximately




46. Four polyester and four cotton carded slivers of the same count and mass CV of 4.16 % are drawn together keeping a draft of 8 on a breaker drawframe. Two slivers from breaker drawframe are further drawn along with the four cotton carded slivers keeping a draft of 6 on a finisher drawframe. The mass CV (%) of the final sliver is approximately




47. A fabric is woven from 38 tex yarns of 0.65 packing coefficient and 1.54 g/cm3 fibre density. The fabric has 30 ends per cm and 25 picks per cm. Assume that warp is jammed. The weft crimp (%) is approximately




48. A fabric is woven from 38 tex yarns of 0.65 packing coefficient and 1.54 g/cm3 fibre density. The fabric has 30 ends per cm and 25 picks per cm. Assume that warp is jammed. The thickness of the above fabric (mm) is approximately




49. The thermal conductivity of a nonwoven fabric is given by λ = 0.03 + 0.00005ρ + 0.15/ρ where λ is the thermal conductivity of the fabric in W/(m⋅K), ρ is the bulk density of the fabric in kg/m3, and ρ∈[10,200]. Thermal conductivity is minimum when the bulk density is approximately




50. The thermal conductivity of a nonwoven fabric is given by λ = 0.03 + 0.00005ρ + 0.15/ρ where λ is the thermal conductivity of the fabric in W/(m⋅K), ρ is the bulk density of the fabric in kg/m3, and ρ∈[10,200]. The minimum value of thermal conductivity, in mW/(m⋅K), is approximately




51. A cotton fibre of 180 millitex has a density of 1.5 g/cm3 and an average perimeter of 40 μm. The average area of the cell wall (μm2) is




52. A cotton fibre of 180 millitex has a density of 1.5 g/cm3 and an average perimeter of 40 μm. The average degree of thickening of cell wall is approximately




53. Which one of the following options is the closest in meaning to the word given below? Pacify