100 IMPORTANT SHORT QUESTION –YARN MANUFACTURING Dear All, It will be the very helpful to achieve some information about Yarn Manufacturing Technology. 1. What is the first process/ machine in yarn production? Ans. Blow room. 2. What is the second process/ machine in yarn production? Ans. Carding machine. 3. What process / machine is used after carding? Ans. Draw frame. 4. What process is used after draw frame? Ans. Simplex. 5. What process is used after simplex? Ans. Ring frame. 8. What is the production of blow room? Ans. Lap. 9. What is the production of carding machine? Ans. Sliver. 10. What is the production of draw frame? Ans. Sliver/Drawing sliver 11. What is the production of simplex? Ans. Roving. 12. What is the production of ring frame? Ans. Yarn. 13. 1 lb(pound) =? Ans. 840 yds=1 Hank=0.4536 kg=453.6 gm=16 ounce(oz). 14. What is the input of blow room? Ans. Bale. 15. What is the input of carding machine? Ans. Lap/Now chute feed system is being used. 16. What is the input of combing? Ans. Sliver lap and number of doubling is usually 20-24. 17. What is the input of simplex? Ans. Drawn sliver, Sliver hank 0.12/0.14/0.16,etc. 18. What is the input of ring frame? Ans. Roving/Roving hank may be 0.75/0.80,etc. 19. What is fiber fineness? Ans. Fineness is one of the most important parameter determining the yarn quality (Fine or Coarse). 20. How fineness is specified for cotton? Ans. Fineness is specified by micronaire value for cotton. 21. The maturity of cotton is defined in terms of the development of cell wall (Yes/no). Ans. Yes. 22. A fully mature fibre has a well developed thick cell-wall (Yes/no). Ans. Yes. 23. what is the botanical name of cotton? Ans. Goosypium Herbacum, Goosypium Hirsutum. 24. In mature fibre, dye absorption is high (yes/no) Ans. Yes 25. In immature fibre, dye absorption is low (yes/no). Ans. Yes 26. What is staple length? Ans. The average length of spinnable fibre is called staple length. 27. If staple length is increase then yarn quality is also increase (yes/no). Ans. Yes 28. Toughness of fibre has a direct effect on yarn and fibre strength (yes/no). Ans. Yes 29. If fibre strength is higher, then yarn and fabric strength is also higher (yes/ no). Ans. Yes 30. Short fibres deteriorate the yarn strength and uniformity (true/false). Ans. True 31. What is the minimum strength for a textile fibre? Ans. Approximately 6 CN/tex (about 6km breaking length) 32. what is tex? Ans. Count is the tex system in the weight in grams of 1000m or 1km of yarn. 33. What is fibre elongation? Ans. Elongation is specified as a percentage of the starting length. 34. What is bale management? Ans. Testing, sorting and mixing bales according to the properties of fibre for producing specific good quality yarn at minimum cost is called bale management. 35. When bale mixing is done? Ans. Before the blow room/Before the bales going into blow room. 36. What are the basic operations in the blow room? Ans. I) Opening II) Cleaning III) Mixing & blending IV) Even feed of material to the card. 37. What is carding? Ans. Carding may be defined as the reduction of an entangled mass of fibre to a filmy web by working them between two closely spaced, relatively moving surface clothed with sharp wire points. 38. Objective of carding. Ans. - To open up the cotton in to single fibre state. - To reduce the number of neps, short fibres. - To produce a thick untwisted rope of fibre called sliver. 39. Carding is called the heart/mother of spinning (true/ false). Ans. True. 40. What are the main objectives of draw frame? Ans. - Straightening & parallelization of fibres by drafting & drawing. - Minimization of irregularity by doubling. - Blending & mixing of fibres. - To produce a more uniform sliver of definite wt/yds. 41. What are the faults of blow room? Ans. 1. Soft lap, 2. Conical lap, 3. Barrel shaped, 4. Split lap, 5. Ragged selvedge, 6. Lap licking. 42. Find out the hank of the lap when the weight of the lap is 14 oz/yds. Ans. 14 oz contains = 1 yds, 1 oz contains = 1/14 yds, 16 oz or 1 lb contains = 16/14 yds =16/14×840 hank=0.0136 hank So hank of lap = 0.00136. 43. Find out the wt/yds of the lap when hank of the lap is 0.0014? Ans. Weight of 0.0014×840 yds = 1 lbs or 16 oz 1.176 yds = 16 oz 1 yds = 16/ 1.176 oz = 13.6 oz So weight of lap = 13. 6 oz/yds 44. For cotton, higher the count, finer the yarn (yes/no). Ans. Yes 45. For jute, lower the count, finer the yarn (yes/ no). Ans. Yes. 46. What is the name of combing waste? Ans. Noils. 47. What is the meaning of TPI? Ans. Turns per Inch/Twist per inch 48. What is the ring frame wastage? Ans. Pnewmafil, banda, sweep, hard waste. 49. What is roving? Ans. A roving is a continuous slightly twisted strand of fibres which has not received its final drawing for yarn. Roving hank=0.70 to 0.85, TPI=about 1.15 50. What are the faults of yarn? Ans. (i) Irregular yarn (ii) Thick & thin places (iii) Slubs (iv) Nepped yarn (v) Spinners double (vi) Crackers (vii) Bad piecing (viii) Hairiness (ix) Soft yarn (x) Hard & non elastic yarn (xi) Rough yarn 51. what is yarn? Ans. It is an assemblage of fibers twisted or laid together to form continuous strand suitable for use In weaving, knitting etc. 52. What is stress? Ans. Stress is the ratio between the applied force and cross sectional area of the specimen, Stress = applied force/ cross sectional area = F/A. Unit of stress is N/m2, dyne/cm2, which is also called Pascal (Pa). 53. What is tenacity? Ans. The tenacity of a fibre is the mass stress at break. Unit – gm/tex, Tenacity = breaking load / mass stress or linear density, Linear density = mass/unit length. 54. What is tensile strength? Ans. Tensile strength = force required to break the specimen/ cross sectional area 55. What is yield point? Ans. The point up to which, a material contains its elasticity is called yield point. 57. More fibre drawing produces more short fibre & resulted weak yarn (yes/no). Ans. Yes 58. What is twist? Ans. Twist is the spirality of bundle of fibres/ filaments. 59. Write down the types of yarn twist. Ans. i. “z” or clock wise & ii. “S” or anti clock wise twist. 60. Twist increases the strength of yarn (true/ false). Ans. True 61. Count of indirect system? Ans. Count unit length unit mass English(Ne) 840yds(hank) lb Metric(Nm) Km(hank) kg Worsted 560yds lb 62. What is IPI? Ans. It indicates yarns thick places, thin places and slubs. 63. What is count? Ans. Count is a numerical expression which expresses /indicates coarseness or fineness of yarn. Or, count is a number indicating the mass per unit length or the length per unit mass of yarn. 64. Different types of measurement. Ans. 1 yard = 0.9144 m 1 m =1.0936 yards=7000 grain 1kg = 2.204 lbs, 1lbs(pound) = 453 .6gm = 7000 grains 1gm =15.43 grains 16 oz = 1 lb(pound) 36 inch = 1 yard 2.54 cm = 1 inch 1 Hank=840 yards=1 pound 65. What is yarn twist? Ans. The spiral disposition of the components of thread which is usually the result of relative rotation of the two ends is called yarn twist. 66. Rotor yarn is “s” twisted (yes/no). Ans. Yes 67. Ring process yarn is “z” twisted (yes/no). Ans. Yes 68. What is strain? Ans. Strain = elongation / initial length 69. what is cleaning efficiency in blow room? Ans. CE% trash cotton - trash in lap/trash in cotton )× 100 70. What is the meaning of CSP? Ans. Count Strength Product CSP= Count × Strength 71. If yarn is regular then CSP is higher (yes/no). Ans. Yes 72. Different relations. Ans. i) Denier = 9 × Tex ii) Ne × Denier = 5315 iii)Tex × Ne = 590.6 iv) Tex × Metric = 1000 v) Denier × Metric = 9000 73. what are the unusable waste in spinning mill? Ans: (a)dropping-II,(b)flat strips of coarse count,(c)Floor sweeping-II,(d)dust etc. 74. HVI(high volume instrument) is a very important m/c of Q.C lab in spinning mill.(yes/no) Ans. Yes 75. what tests are done by HVI m/c? Ans. (a)fineness,(b)trash,(c)length,(d)strength,(e)Color. 76. How can you determine yarn count in English system? Ans. Count (Ne) =length(yds)/length × weight unit/weight in gm = (120yds/840yds) × (1lbs or 453.6gm/weight in gm) =64.8/Weight in gm 77.write down the name of count of direct system? Ans Count (Ne) =length(yds)/length × weight unit/weight in gm = (120yds/840yds) × (1lbs or 453.6gm/weight in gm) =64.8/Weight in gm 77.write down the name of count of direct system? Ans. Txe,K tex,D tex,Mili tex,Denier,lb/spyndle, Woolen. 78.write down the name of count of indirect system and with details? Ans. Count unit lengt unit mass uses a. English (Ne) 840yds(hank) lb cotton b.Metric (Nm) Km(hank) Kg cotton c.Worsted 560yds (hank) lb worsted 79. what do you mean by one lea? Ans. one lea=120 yds. 80. what do you mean by WIRA? Ans. Wool international research association. 81.write down the full meaning of some institution? Ans. (a)BSTI = Bangladesh standard and testing institution. (b) ISO = international organization for standardization. (c) BS = British standard (d) AQL = Acceptable quality level. (e) BCIRA = British cotton industries research association. (f) ITET= institute of textile engineers and technologist. (g)AAMA=American apparel manufacturer association. (h)AAQC=American association of quality control. 82. what is the meaning of MIC? Ans. Microgram per inch. 83. In direct system which one is fixed (mass/length)? Ans. Mass 84. In indirect system which one is fixed (mass/length)? Ans. Length 85. English count is denoted by Ne (yas/no)? Ans. Yes. 86. Metric count is denoted by Nm(yes/no)? Ans. Yes 87. Sliver and roving count is expressed by hank(yes/no)? Ans. Yes 88. What is staple length? Ans. The average length of spinable fiber is called staple length. 89. the shape of yarn become round due to twist (yas/no)? Ans. Yas 90. Name the types of fiber? Ans.normal fiber, thin walled fiber, Dead fibers . 91. How can you express fiber fineness? Ans. Weight per unit length. 92 What are the long staple fiber? Ans. Jute, wool, flax, hemp. 93. what is the modern testing equipment for spinning mill? Ans.(I)HVI(High volume instrument) (II)AFIS(Advance fiber information system) (III)Shirley analyzer = trash% (IV)Moisture meter = MC% (V)Moisture testing oven = MR% 94. What is swelling? Ans. The change in dimension due to absorbing water or moisture of any textile material is termed as swelling. Swelling=(Swollen dimension-Dry dimension)/Dry dimension 95. Where sliver is collected and which form? Ans. In can and coiler form. 96. What are the factors that determine the yarn properties? Ans. Fiber properties, fiber arrangement, twist per inch. 97. Name the modern cone winding machine? Ans. Auto-coner machine/Savio orion 98. Standard MR% &MC% of different fibre. Ans. Fibre MR% MC% Cotton 8.5 7.834 Jute 13.75 12.1 Viscose 11.0 9.91 Nylon 4.0 3.1 Polyester 0.4 × Acetate 6.0 × Acrylic 1.5 × Flax & Hamp 12.4 10.4 Silk 11.0 9.91 Wool 16.0 13.8 99.All yarn of ring processing is Z-twist and rotor yarn is S-twist.(yes/no)? Ans. Yes 100. some meaning- Ans. DCP=Draft change pinion LCP= Lifter change pinion PW = poker wheel TCP = Twist change pinion
Posted on: Fri, 08 Aug 2014 14:46:05 +0000
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