Yarn Manufacturing Gate Questions

August 29, 2017 | Author: Siva Jagadish Kumar M | Category: Spinning (Textiles), Yarn, Spindle (Textiles), Clothing Industry, Textiles
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Textile Technology - Gate Questions - partially solved...


Gate-2000 1. The typical draft used in fly/speed frame is a. 5 - 6 b. 8 -14 c. 20 - 40 d. 80 – 120. 2. The index of irregularity of a drawn sliver is a. 1 b. 10 c. 20 d. 30. 3. The maximum reduction in neps takes place at a. Blow room b. Card c. Comber d. Draw frame. 4. State which of the following spun yarns is the strongest a. Carded ring yarn b. Combed ring yarn c. Rotor yarn d. Friction yarn. 5. The delivery rate of a ring spinning machine producing 25s yarn is 15 m/min. If the spindle speed is 15000 rpm what will be the TM (twist multiplier) in the yarn a. 5.41 b. 4.83 c. 4.64 d. 5.08. match the following: 6. I. Short fibres II. Maturity ratio III. Span length IV. Uniformity ratio

a. less than 1 b. 12.7mm c. 2.5% d. 0.2 – 1.2.

7. I. Short fibres II. Immature fibres III. Fine fibres IV. Long fibres

a. Less yarn flexural rigidity b. High yarn irregularity c. Less than hairiness d. Neppy yarn.

8. I. Rotor spinning II. Ring spinning III. Friction spinning IV. Air jet spinning

a. Finer the count higher the tenacity b. Fibres decelerates while assembling c. Fibres normally accelerates while assembling d. Twisting and winding are inspirable.

9. I. Blow room II. Carding III. Comber IV. Draw Frame

a. Removes short fibres b. Parallelizes fibres c. Removes trash but generates neps d. Removes neps as well as generate neps

10. I. Eccentric roller II. Wider roller setting III. Low roller pressure IV. Narrow roller setting

a. Drafting waves b. Undrafted ends c. Periodic variation d. Reduced effective draft

11. I. Yarn Tension II. Package Density III. Cop Building IV. High cone taper

a. Hard nose b. Square of yarn speed c. Angle of wind d. Chase angle

12. I. Yarn speed in cone winding II. Yarn speed in warping III. Yarn speed in sizing IV. Warp yarn speed on a shuttle loom

a. 0.1 m/min b. 50 m/min c. 800 m/min d. 1500 m/min

13. Presence of immature fibre a. Leads to less roller lapping b. Leads to more roller lapping c. Does not influence roller lapping d. May lead to more or less roller lapping depending on atmospheric conditions 14. In Rieter pressure bar drafting system of draw frame, the front bottom roller is kept at/in a. Same plane compared to middle and back roller b. Lower plane compared to middle and back roller c. Higher plane compared to middle and back roller d. Curved plane compared to middle and back roller 15. Taper of roving bobbin ensures that a. The layers do not slip b. More material is accommodated in the package c. Unwinding tension is uniform d. Spacing between the coils is uniform 16. In ISO standard the traveler number is defined as the mass in grams of a. 10 travellers b.100 travellers c.100 travellers d.1000 travellers

17. In Murata Air Jet Spinning system a. Both the nozzles rotate in clockwise direction b. Both the nozzles rotate in anti-clock wise direction c. First nozzle rotates in clock wise and second nozzle rotates in anti-clockwise direction d. Both the nozzles do not rotate 18. The density of a cone of cotton yarn in g/cm3 is a. 0.15 b. 0.45 c. 0.80 d. 1.10 19. A good spliced joint of a ring spun cotton yarn is a. As strong as the parent yarn b. Stronger than the parent yarn c. 80 to 90% as strong as the parent yarn d. Half as strong as the parent yarn Gate-2001: 20. Higher rotor speed and smaller rotor diameter will require a. Lower twist and higher opening roller speed b. Lower twist and lower opening roller speed c. Higher twist and higher opening roller speed d. Higher twist and lower opening roller speed 21. Cylinder wire for high production card requires comparatively a. Lower wire height and reduced free blade area b. Lower wire height and increased free blade area c. Higher wire height and reduced free blade area d. Higher wire height and increased free blade area 22. Feeding of cotton flocks in clamped condition in blow room a. Gives an intensive and good opening action b. Gives an intensive but poor opening action c. Gives gentle and good opening action d. Gives gentle and poor opening action 23. Increases in conicity would lead to a package of a. Harder nose and softer base b. Softer nose and softer base c. Softer nose and harder base d. Harder nose and harder base

24. Large cross wound packages are usually wound on surface driven winders because a. Precision winders would lead to patterning b. Spindles of precision winders would not be able to withstand the increasing centrifugal force caused but the growing package c. Continuous reduction in wind angle with increasing diameter would make the precision wound package progressively unstable d. Precision winding is uneconomical in view of the need of a control system for continuous regulation of spindle speed Gate-2002: 25. The Partially oriented PET yarn is produced at spinning speeds of a. Less than 1000 m/min b. 1500 – 3500 m/min c. 5000 – 6000m/min d. Above 6000 m/min 26. For the production of good quality yarn, the hardness of front roller cot is a. More than that of back of roller b. Less than that of back roller c. Equal to that of back roller d. Irrelevant 27. The length of lap feel per combing cycle in cotton combing is a.1mm – 3 mm b.4mm – 6 mm c.7 mm - 9 mm d.10mm – 12mm 28. The trash to lint ration in licker-in droppings is usually a.60:40 b.40:60 c.80:20 d.90:10 29. The draft between licker-in and cylinder in a modern cotton card is a.1.25 b.250 c.3.50 d.4.50 30. The bottom roller that carries apron has a. Straight flutes b. Helical flutes c. Knurled surface d. Plane surface 31. If the ratio of bare bobbin to ring diameter is 0.5,the winding angle is a. 300 b. 250 c. 200 d. 350 32. The twist in the yarn arm within the rotor is a. Equal to that of final yarn b. Less than that of final yarn c. More than that of final yarn d. Zero 33. The spinning tension is lowest in a. Ring spinning b. Roter spinning c. Air-jet spinning d. Twist-less spinning 34. As twist is removed from motor yarn a. The strength continuously decreases b. The strength decreases at first and then increases again c. No change in strength occurs d. The strength increases at first and then decreases

35. The blow room and card cleaning efficiencies are 60% and 90% respectively. If the trash present in card sliver is 0.08%,what was the trash level in the bale? a. 2.4 b. 2.0 c.3.0 d.2.8 36. Twisting and winding operations are inseparable in b. a. Rotor spinning b. Ring spinning c. c. Friction spinning d. Air-jet Spinning 37. The doffing period in minutes of a 1.5kg package being wound at a winding speed of 1000 m/min with 90% efficiency from 12 tex yarn would be a.131.7 b.138.8 c.143.2 d.147.5 Gate-2003: 38. Drawing and doubling operations on draw frame are mainly used to a. improve short and medium term variation in sliver b. improve long term variation in sliver c. improve sliver strength d. make the sliver finer 39. The purpose of using autoleveller is to improve a. fibre orientation in yarn b. yarn count CV% c. yarn strength d. yarn faults 40. The sequence of three major operations in forward feed combing is a. combing – detaching – feeding b. combing – feeding – detaching c. detaching – combing – feeding d. feeding – detaching – combing 41. In which would the twist density be the highest in ring spinning a. Spinning zone yarn b. Balloon zone yarn c. Winding zone yarn d. Bobbin yarn 42. In rotor spinning, the yarn tension is maximum a. at yarn formation point b. at the navel c. outside the doffing tube d. in the radial portion of the yarn within the rotor

43. Group I P Pin texturing Q Draw Texturing R Friction spinning S Air jet texturing

Group II 1 Surging 2 Stretch yarn 3 Bulked yarn 4 High speed 5 POY 6 More noise

a. P6-Q5-R3-S1 b. P1-Q2-R4-S6 c. P6-Q5-R1-S3 d. P2-Q5-R4-S1 A yarn is produced by blending two fibres X and Y whose particulars are given below X Y Fineness 2 denier 21 microns Blend% 50 50 44. The denier of fibre Y is (take density of fibre Y as 1.3 g/cm3) a. 1 b. 2 c. 3 d. 4 45. The average denier of the blend is a. 2.10 b. 2.66 c. 1.66 d. 3.00 46. The limit irregularity of a 200 denier yarn spun from this blend is a. 10.55 b. 12.55 c. 11.55 d. 14.55 47. A blended yarn is produced by plying two yarns having the following specifications I II Yarn Tex 20 10 Mass irregularity (CV%) 15 20 The CV% of the ply yarn is expected to be around a. 10 b. 11 c. 12 d. 13 48. The hairiness of a ring yarn increases as a. fibre length increases b. heavier traveller is used c. yarn is made finer d. ring frame draft increases

49. The trash content in cotton fed to a beater is 4%. The waste extracted by the beater is 2%. If the waste contains 60% trash, what is the cleaning efficiency of the beater? a. 25% b. 30% c. 35% d. 20% 50. If the ratio of winding-on diameter to ring diameter is 0.86, what is the angle of yarn pull? a. 300 b. 600 c. 370 d. 270 51. An eight head comber is running at 200 nips/min. The lap feed is 60 ktex and noil level is 20%. If the lap feed/nip is 7mm, the production in kg/hr at 90% machine efficiency will be a. 25 b. 29 c. 33 d. 40 52. If the actual draft in a card is 90 and the mechanical draft 85, the waste % extracted by the card will be a. 5.0% b. 5.5% c. 6.0% d. 7.0% 53. A ring frame running at 14000 rpm is producing yarn at 15m/min. The difference in yarn twist (turns/cm) in the yarn when the package diameter changes from 20 mm to 36 mm will be a. 8.0 b. 9.2 c. 7.1 d. 10.1 54. Which of the following statements is correct in regard to the processing of micro denier fibre vis-a-vis normal fibre? a. Card production rate must be decreased b. Higher yarn twist is required on ring frame c. Less roller pressure is required on ring frame d. Drafting speed on draw frame must be increase 55. A single yarn of 30 tex is converted into two ply yarn. If the ratio of tenacities of the plied and single yarn is 1.2, the ratio of their breaking strengths will be a. 2.0 b. 3.0 c. 2.4 d. 4.0

56. A yarn of 16 Ne is spun on a 46mm diameter rotor spinning machine at 100 m/min. The measured TM in the yarn is 4.4. Considering the loss in machine twist as 10%, the number of fibre layers within the rotor at the yarn formation point will be a. 100 b. 111 c. 120 d. 130 57. In case of polyester – cotton blended yarn which one of the following statement is true a. Polyester fibre predominates on yarn surface b. The blended yarn id stronger than 100% polyester yarn c. Cotton fibre predominates on yarn surface d. The yarn is less extensible than 100% cotton yarn 58. Group I P High drafting force Q Periodic variation R Drafting wave S Roller slip

Group II 1. Low roller pressure 2. Long and fine fibres 3. Eccentric roller 4. Thick and thin places 5. Short fibres 6. Spin finish

a. P2-Q3-R4-S1 b. P4-Q1-R3-S2 c. P6-Q5-R2-S3 d. P6-Q1-R3-S5 59. Group I P Air jet spun yarn Q Rotor spun yarn R Dref-2 friction spun yarn S Ring yarn

a. P3-Q2-R6-S1 b. P6-Q2-R1-S3 c. P1-Q3-R4-S2 d. P2-Q6-R1-S3 Gate-2004: 60. Average cotton fibre strength is cN/tex is a. 10-20 b. 20-30 c. 30-40 d. 40-50

Group II 1. Highest bending rigidity 2. Strongest 3. Most uniform 4. Weakest 5. Bulkiest 6. Core-strength

61. Index of irregularity is the highest in the case of a. Card Sliver b. Roving c. Carded Yarn d. Combed Yarn 62. The highest degree of mixing in the yarn is obtained by a. Flock blending b. Lap blending c. Sliver blending d. Web bending 63. In a carding machine, the setting is minimum between a. Cylinder to licker in b. Feed plate to licker in c. Front plate to cylinder d. Cylinder to doffer 64. In a fly frame, spindle top inserts with grooves are used to introduce a. Real twist in the roving b. Further draft in the roving c. False twist in the roving d. Tension in the roving 65. In ring spinning, Coriolis force acts in a. Break draft zone b. Main draft zone c. Spinning zone d. Balloon zone 66. A modern rotor spinning machine with 30 mm rotor diameter can achieve a maximum rotor speed of the order of a. 50,000 rpm b. 80,000 rpm c. 1,30,000 rpm d. 1,80,000 rpm 67. With an increase in draft, the drafting force a. Increases b. Decreases c. Decreases and then levels off d. Increases and then decreases 68. Hardness of a cone can be changed by changing the a. Traverse b. Wind per double traverse c. Wind angle d. Conicity of the package

69. In a surface driven winding machine, with an increase in package diameter a. The winding speed would increase b. The package rpm would go up c. The coil angle would decrease d. The number of coils per double traverse would fall steadily 70. Consider the following statements with respect to the false twist texturing P It is a thermo-mechanical process Q There is no net twist in the false twist textured yarn R The temperature in the primary heater is kept near glass transition temperature S Cooling zone is located before the friction twisting device The sett of correct statement is a. P, Q, R b. P, Q, S c. Q, R, S d. P, R, S 71. On a draw frame, 6 slivers with a CV% of 6 each are drafted with a draft of 6. If the drafting system introduces 1.732% additional CV during the drawing of slivers, the CV% in drawframe sliver will be a. 3 b. 6 c. 9 d. 12 72. Among the following yarns, the finest is a. 40s Ne b. 40 Tex c. 40 Denier d. 100s Ne 73. Blending delay time in a multi mixer increases if a. The machine speed id reduced b. Capacity and number of chutes are reduced c. The chutes are filled slowly d. Capacity and number of chutes are increased 74. A blow room has three cleaners in series. The overall cleaning efficiency of the blow room is 60%. If the cleaning efficiencies of the first and the third cleaners are 30% and 25% respectively, the cleaning efficiency of the second cleaner is a. 5.0 % b. 11.9 % c. 22.4 % d. 23.8 %

75. Consider the following statements with respect to ring and travellers in a ring spinning machine P The contact area between the ring and the traveller should be maximized Q The center of gravity should be as high as possible R The hardness of the traveller should be less than that of ring S Elliptical travellers can be used with all types of rings The sett of correct statement is a. P, Q b. Q, R c. P, R d. P, S 76. In a carding machine, fibre straightening is attainted to maximum extent in a. Cylinder to flats carding region b. Cylinder to doffer transfer region c. Licker-in to cylinder region d. Cylinder to under casing region 77. Consider the following statements with respect to compact spinning as compared to conventional ring spinning P The spinning triangle is reduced to a large extent Q The spinning tension is increased to a large extent R The hairiness of the yarn is lower S The yarn strength is lower The sett of correct statement is a. Q, S b. P, R c. Q, R d. R, S 78. A twin delivery draw frame delivers slivers of count 0.14s Ne at 300m/min with a production efficiency of 95%. The production rate in kg/hr is a. 60 b. 125 c. 145 d. 290 79. Consider the following statements as the possible causes for the high U% of a ring spun yarn P Apron slippage in the ring frame Q Eccentric back bottom roller in ring frame R Improper drafting in the draw frame S Damaged front top roller in ring frame The sett of correct statement is a. R, S b. P, R c. P, S d. P, Q, S

80. In a sliver lap machine, 24 slivers of 0.12s Ne are combined and a draft of 2.4 is given. In the ribbon lap machine, 6 of these laps are combined after giving a draft of 4.2 to each of these laps. The linear density of the resultant lap in g/m is a. 54.4 b. 59.2 c. 65.1 d. 70.3 81. Consider the following statements with respect to air jet spinning P The air vortex speed in the second nozzle is higher than that of the first nozzle Q The yarn has harder feel compared to ring spun yarn R The yarn has uniform twist structure through out the yarn cross section S A high draft of 100 to 200 is provided with roller drafting system The sett of correct statement is a. P, Q, S b. P, R, S c. P, Q, S d. Q, R, S 82. The final yarn count required in a ring frame is 40s Ne with 26 tpi. The twist contraction during spinning is 2.7%. If the feed roving count is 1.6s Ne, the draft in ring frame should be a. 25.0 b. 25.7 c. 26.0 d. 26.7 Gate-2005: 83. The typical value of waste percentage generated at flats while processing normal polyester fibre on a modern card is a. 0.1% b. 0.5% c. 1.0% d. 2.5% 84. Modern blow room with contaminant removal attachment based on optical scanning principle cannot detect a. jute threads b. leafy matters c. white plastic materials d. black fabric pieces 85. Speed of a modern comber is around a. 100 nips/min b. 200 nips/min c. 400 nips/min d. 800 nips/min

86. ‘Barkolising’ is a treatment associated with a. Ring b. Traveller c. Flyer d. Cots 87. The range of fibre length for web formation by aerodynamic method is a. low atomic size of sodium b. very slow penetration of fibre c. no interaction with cellulose d. easy availability at economical cost 88. A bobbin leading speed frame running at 1000 rpm spindle speed is producing a roving with 2.5 turns per inch. The diameter of empty bobbin is 5 cm. When the bobbin attains to cm diameter, the percentage change in the bobbin speed will be approximately a. 1 % b. 3 % c. 5 % d. 7 % 89. The permissible minimum angle of lead is 30o. For a ring of 40mm diameter, the minimum bobbin diameter is a. 15 mm b. 18 mm c. 20 mm d. 21 mm 90. In folded yarns, the folding twist is in opposite direction to the spinning twist. The twist ratio (folding twist/spinning twist) required to make the yarn free from the snarling tendency is approximately a. 0.55 b. 0.66 c. 0.77 d. 1.0 91. The yarn manufacturing technologies have been arranged in ascending order with respect to twisting potential per unit time. The correct set is a. Ring – Rotor – Friction - Jet b. Rotor – Ring – Jet - Friction c. Ring – Rotor – Jet - Friction d. Rotor – Friction – Ring - Jet 92. The actual twist in a rotor yarn produced with rotor diameter of 40 mm, rotor speed of 90000rpm and delivery speed of 100m/min will be approximately a. 892 tpm b. 900 tpm c. 908 tpm d. 918 tpm

93. In a friction spinning process, the diameter of the perforated drum and the average yarn tail diameter resting on the drum are 44 mm and 0.22 mm respectively. The drum and the yarn delivery speeds are 5000 rpm and 250 m/min respectively. The actual twist in the yarn with 20% twist efficiency is a. 400 tpm b. 600 tpm c. 800 tpm d. 1000 tpm 94. Determine the correctness or otherwise of the following assertion (a) & reason (r) Assertion: The strength of a pneumatically spliced joint of a single cotton yarn results out of the load bearing capacity of the largely parallel fibers in the central section of the joint Reason: The central section is surrounded by densely clustered groups of fibres, which are highly twisted and intermingled. On application of tensile load, these fibers slip and progressively grip the central section tightly, enhancing in the process their load bearing capacity a. Both (a) and (r) are true and (r) is the correct reason for (a) b. Both (a) and (r) are true and (r) is not the correct reason for (a) c. Both (a) and (r) are false d. (a) is true but (r) is false Gate-2006: 95. In air jet spinning system, P1 and P2 are the supply of air pressures at rear nozzle (entry side) and the front nozzle (delivery side), respectively. The relationship between P1 and P2 is a. P1 < P2 b. P1 > P2 c. P1 = P2 d. P1 ≥ P2 96. The draft between feed roller and licker-in in a carding machine is approximately a. 100 b. 500 c. 1000 d. 2000 97. Spinning-in coefficient refers to a. Spinning limit b. Limiting CV% of yarn c. Intensity of migration d. Spun-in fibre length

98. Annealing is a process of keeping a material at an appropriately high temperature for a specified period of time. Consider the following statements in the context of fully drawn thermoplastic filament yarn which is subjected to free annealing P The stored energy is released Q The crystallinity of the yarn decreases R Overall orientation of the yarn increases S The yarn becomes dimensionally more stable a. P, Q b. R, S c. Q, R d. P, S 99. Some times false twist texturing machines are provided with interlacement nozzles just before the winding unit. Choose the correct set of answers from the following P This allows to produce false twist and air jet textured yarn Q This reduces stretch in the resulting yarn to make it suitable for making suiting fabrics R This helps eliminate the twisting operation which otherwise is necessary before fabric manufacturing S This increases the cohesiveness between filaments of textured yarn a. P, Q b. R, S c. Q, R d. P, S 100. In the context of combing cycle, consider the following process sequences P Lap feeding ≫ Cylinder combing ≫ Forward movement of nipper ≫ Top comb lowering Q Lap feeding ≫ Top comb lowering ≫ Cylinder combing ≫ Detaching R Cylinder combing ≫ Nipping ≫ Top comb lowering ≫ Forward movement of nipper S Nipping ≫ Cylinder combing ≫ Forward movement of nipper ≫ Detaching The sett of correct statement is a. P, Q b. P, S c. Q, R d. R, S 101. 4.93 ktex sliver is fed in a rotor spinning machine with opening zone draft of 1400. The draft in the transport duct is 5 and the sliding draft on the rotor wall till the rotor groove is 2. If the back doubling within the rotor is 125., the approximate linear density (tex) of the put yarn is a. 44 b. 39 c. 24 d. 29

102. Consider the following statements with reference to the properties of rotor spun yarn vis-a-vis the equivalent ring spun yarn P Breaking strength is lower & abrasion resistance is higher Q Hairiness is lower and surface is more lustrous R Bending rigidity is higher & abrasion resistance is lower S Diameter and uniformity are higher The sett of correct statement is a. P, Q b. P, S c. Q, R d. P, Q, R, S 103. An idealized hexagonal closed packed yarn has seven layers of 1.2 dtex fibres. The approxiamte count (Ne) of yarn is a. 29 b. 39 c. 49 d. 59 104. The direct twist factor of a single 29.5 tex P/V yarn is 38.28 tpcm.tex.. To keep twist per unit length same, the indirect cotton twist multiplier (tpi.Ne-.) of 30 Ne cotton yarn will be approximately a. 2.95 b. 3.27 c. 2.27 d. 3.83 105. Consider the following statements with reference to compact spinning vis-a-vis ring spinning P The size of the spinning triangle is smaller Q The yarn hairiness is lower R The draft is higher S The twist loss is lower The sett of correct statement is a. P, Q b. P, R c. Q, R d. R, S The passage of yarn is a two-for-one twister is Yarn feed package (1) → Freely rotating yarn guide arm (2) → Rotating spindle (3) → Yarn take up roller (4) → Take up package (5) 106. The direction of twist between different points is a. ‘S’ between 1&2 and ‘Z’ between 2&3 b. ‘S’ between 1&3 and ‘S’ between 3&4 c. ‘Z’ between 1&2 and ‘S’ between 2&3 d. ‘S’ between 1&2 and ‘Z’ between 3&5

107. The traverse (cm) of the headstock of a sectional warping machine for winding a section of 10 cm thickness from a warp sheet of 30 cm width on a drum of 250 conicity is approximately a. 10 b. 20 c. 30 d. 40 108. A carded web of 30 g/m2 and 1 m width is converted into a batt of 300 g/m2 and 2.5 m width by a cross lapper. The card delivers the web at 20m/min. The batt out of the cross lapper approximately at the speed (m/min) of a. 1 b. 2.5 c. 5 d. 8 The following data refers to a cone winding process: – Package diameter = 20 cm – Package height = 25 cm – Drum diameter = 8 cm – Scroll of the drum = 2.5 – Winding speed = 1000 m/min 109. The number of coils on the surface of the package is a. 0.5 b. 1.0 c. 1.5 d. 2.0 110. The rpm of the drum is approximately a. 3,000 b. 3,400 c. 3,700 d. 4,000 111. A carding machine, working at 90% efficiency, has cylinder radius 0.63m, cylinder surface speed 1600 m/min, doffer surface speed 40m/min and production rate 10.8 kg/h. Assuming that there is no draft between doffer and delivery roller, the linear density (ktex) of card sliver will be approximately a. 5 b. 4 c. 3 d. 2 112. If the mass of fibre presented to the doffer per revolution of cylinder is 3.3gm, the transfer coefficient of the carding machine will be approximately a. 0.10 b. 0.15 c. 0.20 d. 0.25

Gate-2007: 113. On a carding machine a. Doffer wire point height is more than that of cylinder b. Doffer wire point height is less than that of cylinder c. Doffer and cylinder wire point heights are the same d. Doffer and Licker-in wire point heights are the same 114. Six slivers are doubled together and given three passages on draw frame. The number of doubling is a. 9 b. 18 c. 216 d. 486 115. Out of the following, the technology that produces S & Z twists in the same yarn is a. Rotor spinning b. Ring spinning c. Warp spinning d. Self twist spinning 116. Yarn tension during unwinding from a cop is a. High at full cop and low at empty cop b. Constant irrespective of stage of unwinding c. Low at full cop and high at empty cop d. Highest at the beginning, decreases gradually and rises again 117. Bulking of the filaments CANNOT be achieved by a. False twist texturing process b. Non circular cross sections of individual filaments c. Differential shrinkage of biconstituent yarn d. Thermo-mechanical setting under taut conditions 118. The contraction of a yarn upon twisting is 1.07. The twisted yarn count is 30 tex. If 2 dtex fibres are used to produce the yarn, the number of fibres present in yarn cross section is a. 140 b. 145 c. 150 d. 160 119. During spinning of a yarn on ring frame, the yarn tension is maximum at a. Lappet guide b. Maximum balloon radius c. Traveller d. Front roller nip

120. To produce a soft and flexible yarn, one needs a. Fine fibres and high twist b. Coarse fibres and high twist c. Fine fibres and low twist d. Coarse fibres and low twist 121. In the context of staple fibre spinning, choose the correct statement a. The flyer rotates faster than the bobbin in a bobbin leading speed frame b. The traveller runs at the speed of the spindle in ring frame c. The vortex created by jets 1 & 2 rotate in the same direction in air jet spinning d. The peel-off point in rotor spinning rotates faster than rotor 122. Placing a condenser in the drafting zone leads to increase in a. Nep generation b. Fly generation c. Yarn hairiness d. Yarn evenness 123. Out of the following spinning systems, in which case the fibres get decelerated as they travel from feed to yarn formation point a. Ring spinning b. Parafil spinning c. Air-jet spinning d. Friction spinning 124. The waste extraction in blow room, card and comber are 6%, 4% and 16% respectively. The weight of combed sliver (kg) from 1 kg of cotton from bale would be a. 0.720 b. 0.740 c. 0.758 d. 0.765 125. Consider the following statements pertaining to irregularity generated in sliver after drafting P The irregularity increases with decrease in draft Q The irregularity increases with increase in short fibre % R The irregularity increases with increase in distance between roller nips S The irregularity increases with increase in unevenness of fed sliver The sett of correct statement is a. P, Q, R b. P, R, S c. Q, R, S d. P, Q, S

126. In the context of winding, occurrence of slough off increases with a. Increase in winding speed, decrease in cone angle, decrease in chase length,increase in coils per cm b. Increase in winding speed, increase in cone angle, decrease in chase length,increase in coils per cm c. Decrease in winding speed, decrease in cone angle, increase in chase length,decrease in coils per cm d. Increase in winding speed, decrease in cone angle, increase in chase length,decrease in coils per cm 127. In a winding operation if E is clearing efficiency, K is knot factor and n is number of objectionable faults presents in yarn, then total number of clearer breaks occurring on the machine would be a. EKn b. EK/n c. En/K d. En2K A 46 mm diameter rotor is spinning 60 tex yarn at 100 m/min. The trash level in feed sliver is 0.2%. The opening roller can clean the sliver to the extent of 70%. The self cleaning effect of the yarn arm within the rotor is 50% 128. Trash deposition (mg/cm of rotor circumference) after 1 min will be a. 0.1245 b. 0.1320 c. 0.1420 d. 0.1485 129. In an interruption in spinning is expected once the deposition attains 0.2 mg/cm in the rotor groove, number of end breaks expected in 8 hours is a. 260 b. 290 c. 299 d. 312 Gate-2008: 130. With the use of heavier traveller a. Spinning tension decreases b. Yarn elongation increases c. Yarn balloon size increases d. Yarn hairiness decreases 131. When the doffer of a card fed by chute feed system is stopped a. Accelerating flaps closed b. Separating flaps open c. Differential pressure regulator stops working d. Exhaust flaps close

132. Air jet texturing makes multifilament yarn more suitable as weft in air jet weaving. Because the yarn becomes a. Rigid and does not bend in the shed b. Smooth and helps to reduce friction with warp c. Bulkier & results in high propelling force d. Heavier & produces high kinetic energy 133. During winding on the ring frame a. The downward movement of ring rail is slow and accelerating b. The downward movement of ring rail is fast and accelerating c. The upward movement of ring rail is slow and accelerating d. The upward movement of ring rail is fast and accelerating 134. In drawframe, higher top roller pressure is used for polyester fibres compared to cotton fibres because they have a. Lower compressional resilience b. Lower density c. Higher inter fibre friction d. Lower moisture absorption 135. The flyer leading mechanism in short staple roving frame is not used because of P Design limitation of differential gear box Q Energy consideration R Slough off problem S Start up problem The sett of correct statement is a. P, Q, R b. P, R, S c. Q, R, S d. P, Q, S 136. Quasi-periodic irregularity of slivers is caused by a. Higher short fibre content b. Broken gear tooth c. Roller eccentricity d. Improper meshing of gears 137. If the specific volume of yarn is increased by 21%, the percentage increase in yarn diameter would be a. 4.6 b. 10.0 c. 10.5 d. 21.0 138. In a flat yarn, the number of filaments in the yarn cross section is 271. The yarn is divided into 5 segments of equal radial increments which are numbered as 1,2,3,4 and 5, from yarn core to surface respectively. The approximate number of fibres in the 4th segment is a. 50 b. 80 c. 90 d. 110

139. In a card, theoretically it is beneficial to have smaller cylinder running at higher rpm because it P Results in saving of space Q Improves carding action R Increases carding area S Improves fibre transfer from licker-in to cylinder The sett of correct statement is a. P, Q b. R, S c. Q, R d. Q, S The number of spindles assigned to a spinner is 1200. The end breakage rate is 15 per 100 spindle-hours. The number of standing breaks at any time is 9 140. The loss (%) in machine efficiency due to end breakage is a. 7.5 b. 1.0 c. 0.75 d. 0.50 141. If a spinner has the capacity to attend 36 breaks in one patrol which takes 9 minutes, the spindle to be allocated per spinner to maintain the same efficiency, will be a. 800 b. 1200 c. 1600 d. 2000 GATE-2009: 142. The maximum practical limit of spindle speed in a commercial cotton ring frame is around a. 5000 rpm b. 10000 rpm c. 20000 rpm d. 30000 rpm 143. Ring spun cotton yarns of 30, 40, 50 and 60 tex are made from the same fibre. All these yarns are spun with the constant twist per cm of 10. The yarn can be arranged in descending order of helix angle of surface fibres as a. 30, 60, 50, 40 b. 40, 60, 50, 30 c. 30, 40, 50, 60 d. 60, 50, 40, 30 144. Hairiness of ring spun yarn increases, when a. Traveller weight increases b. Front zone draft at ring frame increases c. Spindle speed decreases d. Ring rail speed increases

145. Surface speed of cone in relation to surface speed of winding drum is a. Equal at all points b. Higher at all points c. Lower at all points d. Higher at some points and lower at some points 146. Consider the fibre characterization techniques in Group I used to test the physical properties in Group II Chose the correct combination Group I P Licker In Q Cylinder R Flats S Doffer

Group II 1 high speed, fine wires 2 fibre rapture, coarse wires 3 wires with an acute front angle, condensing of fiber 4 slow speed, striping action 5 Nep removal, slowest speed

a. P5-Q3-R2-S1 b. P1-Q2-R5-S4 c. P4-Q4-R3-S5 d. P2-Q1-R5-S3 147. Pressure field from the nip of drafting roller can be extended by a. Reducing the roller pressure and increasing hardness of top roller b. Reducing mass of fibre strands and reducing the roller diameter c. Increasing the roller diameter and pressure d. Increasing width of fibre strand and hardness of top roller 148. A blow room has five machines. The total cleaning efficiency for the first four machine is 40%. The cleaning efficiency of last machine is 30%. The overall cleaning efficiency (%) of blow room is a. 70 b. 64 c. 58 d. 52 The feed rate of card is 100 kg/hour and the delivery rate is 400 mtrs/min Licker in droppings and flat strips are 3% and 1% respectively 149. The count of card sliver (Ne) will be approximately a. 0.16 b. 0.15 c. 0.14 d. 0.13 150. If the total draft in the card is decreased by 10%, the sliver linear density in ktex will be a. 6.4 b. 5.4 c. 4.4 d. 3.4

151. Two roving with a CV% of 8 each are fed into a spinning zone and if the spinning units adds 8% CV, the CV% of output yarn will be approximately a. 8.0 b. 8.9 c. 9.8 d. 12.0 Gate-2010: 152. In which of the following regions of a carding machine, the fibre alignment is distributed to the maximum extent? a. Cylinder to doffer transfer region b. Licker in to cylinder transfer region c. Cylinder to cylinder under casing region d. Cylinder to flats carding region 153. Pressure bar is provided in a draw frame to a. Increase the pressure on the middle top drafting roller b. Reduce the intensity of drafting waves in the drafted strand of fibres c. Reduce the pressure on the middle top drafting roller d. Reduce the formation of neps in the drafted strand of fibres 154. Which of the following yarns is the finest? a. 10s Ne b. 10 Tex c. 100s Ne d. 100 Tex 155. The rotor spun yarn has better uniformity than the ring spun yarn of the same count and fibres. The reason is a. The highest production rate of rotor spinning system b. The fibre doubling occurring inside rotor c. The presence of wrapper fibres in rotor spun yarns d. In rotor spinning, twisting and winding are separated 156. 30 bales of 3.5 Mi and 40 bales of 4.0 Mi cotton fibres (Mi is Micronair value of cotton fibres) are already available in the raw material inventory of the mill. What is the approximate Mi value required of another 30 bales so that the resultant mean Mi of the total 100 bales will be 4.0? a. 3.4 b. 4.7 c. 5.2 d. 6.0

157. Which of the following statements are NOT true? P – Ring spun yarns have higher fibre migration than DREF – 2 friction spun yarns Q – The rotor spun yarns have uniform twist structure across the cross section R – Air jet spun yarn is formed by fibre wrapping S – Minimum number of fibres required for a particular count yarn is higher for ring spun yarns as compared to rotor spun yarns a. Q, S b. P, R, S c. P, Q d. Q, R, S A speed frame with all the drafting rollers of 25.4 mm diameter has the following process parameters: Roving count – 1.5s Ne; Front drafting speed – 220 rpm; Roving diameter – 3.0 mm; Roving twist multiplier – 1.2 tpi Ne-1/2; Empty bobbin diameter – 76.2 mm 158. Spindle speed will be a. 824 rpm b. 968 rpm c. 1016 rpm d. 1106 rpm 159. The ideal bobbin rack speed for the first layer of roving being directly wound on the empty bobbin will be approximately a. 220 mm/min b. 240 mm/min c. 260 mm/min d. 280 mm/min Gate-2011: 160. For a given yarn count made from the same fibre, rotor spun yarn is bulkier than ring spun yarn, because (A) Rotor spun yarn is more even than ring spun yarn (B) Navel tube peels off the fibres from rotor spun yarn surface (C) Rotor spun yarn has large number of wrapper fibres (D) Yarn tension in rotor spinning is lower as compared to that in ring spinning 161. Consider the statement, ‘off-setting the front top drafting roller towards the front is beneficial in a ring spinning machine’. Which one of the following CANNOT be the reason for the same? (A) It reduces the hairiness of yarn (B) It results in smooth running of top drafting roller (C) It reduces end breaks (D) It results in shorter spinning triangle 162. During roller drafting, better fibre control is achieved by flexing the fibre strand over the bottom roller. The reason for this is (A) Enhanced fibre to fibre coefficient of friction (B) Enhanced fiber to fibre friction (C) Reduced slippage of top roller (D) Reduced fibre to metal friction

163. The delivery rate of a roving machine is 20 m/min. Assuming the flyer speed as 1000 rpm, inner diameter of the flyer top as 1 cm, diameter of roving as 2.5 mm, and the slippage between the flyer top and roving as 50 %, the false twist (turns/m) in the roving above the flyer is ______99.9 to 100.1_______ 164. Determine the correctness or otherwise of the following assertion [a] & reason [r]. [a] When the bales are highly compressed, photo cells near the inclined spiked lattice of a Hopper bale opener are set at a lower height. [r] Position of photo cells controls the mass flow rate of tufts within the Hopper bale opener (A) [a] is right and [r] is wrong (B) [a] is wrong and [r] is right (C) Both [a] and [r] are right (D) Both [a] and [r] are wrong 165. The ring rail moves up and down in a cyclic manner during formation of a cop. The combination of events occurring during upward traverse of the ring rail is P) Traveller speed decreases Q) Balloon tension decreases R) More yarn is wound by the traveller S) Balloon tension increases (A) P, Q, S (B) P, Q, R (C) Q, R, S (D) P, R, S Common Data for Questions 166 and 167: A card with a doffer of diameter 60 cm, fed with a lap of 395 ktex delivers sliver of 3.95 ktex. The draft between the doffer and the coiler calender roller is 1.4. 166. The total draft of the card is (A) 71 (B) 140 (C) 100 (D) 171 167. If the doffer speed is 50 rpm, the approximate production rate of the card in kg/h would be (A) 6 (B) 22 (C) 31 (D) 88 GATE-2012: 168. The range of spinning speed (m/min) used in the manufacture of partially oriented polyester yarn is (A) 1000 − 1200 (B) 2000 − 2500 (C) 2800 − 3500 (D) 4000 − 6000

169. Drawing of synthetic filament does not lead to an increase in (A) Crystallinity (B) Tenacity (C) Tensile modulus (D) Elongation at break 170. In a card, the wire point density is maximum on (A) Cylinder (B) Flat (C) Doffer (D) Licker-in 171. The spinning system that does not generate false twist during spinning is (A) Ring spinning (B) DREF 3 (C) Rotor spinning (D) Air jet spinning 172. Most of the seed coat particles are removed in (A) Blow room (B) Card (C) Comber (D) Draw frame 173. An eccentric top roller in a drafting system leads to (A) Change in draft with oscillation of nip line (B) Change in draft without oscillation of nip line (C) Neither change in draft nor oscillation of nip line (D) Oscillation of nip line only 174. The increase in traveller weight leads to an increase in (A) Yarn twist (B) Traveller lag (C) Balloon diameter (D) Yarn tension 175. Cleaning efficiency of the opening roller in a rotor spinning machine, having 56mm diameter rotor, is 80 %. The yarn breaks when the trash deposition within the rotorgroove 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 ___2___. 176. 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 (A) 140 (B) 160 (C) 180 (D) 200 177. 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 (A) 180 (B) 190 (C) 200 (D) 210 GATE-2013: 178. A machine that does not improve the mass evenness is (A) Drawframe (B) Ring doubler (C) Speedframe (D) Ribbon lap 179. Fibre individualization in a card will increase by increasing (A) Licker-in to cylinder setting (B) Doffer speed (C) Licker-in speed (D) Cylinder speed 180. Softer cots on drafting rollers result in (A) An increase in drafting wave (B) Less fibre slippage at roller nip (C) Change in draft (D) Reduced roller lapping

181. Compared to the spinning of finer cotton yarns, the preferred rotor diameter for the production of very coarse cotton yarns would (A) Be higher (B) Be lower (C) Remain the same (D) Change depending on fibre strength 182. Amongst the following, the suitable technology for producing core spun yarn is (A) Air vortex spinning (B) Rotor spinning (C) Friction spinning (D) Air-jet spinning 183. In a card the probability of fibre transfer from cylinder to doffer in one revolution of cylinder is 0.2. The probability that a particular fibre will be transferred to the doffer within the first three revolutions of cylinder is _______. 184. Consider the following assertion [a] and reason [r] and choose the most appropriate answer [a] In false-twist friction texturing, the ratio of input to output tension is kept close to one [r] Broken filaments and tight spots are within the acceptable limits at this condition (A) [a] is right [r] is wrong (B) [a] is right [r] is right (C) [a] is wrong [r] is wrong (D) [a] is wrong [r] is right 185. The advantage of flyer leading over bobbin leading speed-frame is (A) Lower roving stretch (B) Lesser chance of unwinding after breakage (C) Lower power requirement (D) Power requirement remains fairly constant during the bobbin build up A winding machine without anti-patterning device has the following particulars: Cylindrical winding drum diameter : 75 mm Number of crossing on drum : 2 21 Rotational speed of the drum : 2860 rev/min Traverse length : 150 mm A 3.5 degree constant taper cone is built on the above cone winder with no movement of the point of drive during the package build up. At mean cone diameter of 150 mm the package rev/min is 1375. 186. The number of times major patterning will occur in producing 200 mm mean diameter package on 40 mm mean diameter core is (A) 5 (B) 7 (C) 9 (D) 11 187. Distance in mm of point of drive from the base of the cone along the traverse is apapproximately (A) 26 (B) 30 (C) 36 (D) 40

Linked Answer Questions 188 and 189: The angle subtended by the half-lap on the cylinder comb is 90o. The time taken by the halflap to comb a fringe is 0.04 s. 188. The speed of the comber in nips/min is (A) 325 (B) 350 (C) 375 (D) 400 189. From the following data, calculate approximate production rate in kg/hr Length of lap fed per nip : 6 mm Lap linear density : 60 ktex Noil : 20% Efficiency : 80% Number of heads : 6 (A) 21 (B) 26 (C) 31 (D) 36 GATE-2014: 190. In a cotton card, the wire point density on (A) Cylinder is lesser than that on flat (B) Doffer is greater than that on cylinder (C) Cylinder is greater than that on flat (D) Flat is greater than that on doffer 191. In a drawframe with 3 over 3 drafting system, the roller most prone to slip is (A) Middle top roller (B) Front top roller (C) Back top roller (D) Front bottom roller 192. Fibre parallelization in drawn sliver improves with (A) Increase in draft (B) Increase in doubling (C) Decrease in roller setting (D) Increase in roller pressure 193. The combing force increases with (A) Decrease in mass/unit length of lap (B) Decrease in pre-combing draft (C) Decrease in needles/cm on half lap (D) Decrease in nips per minute 194. A cleaning unit in a blowroom is processing cotton at 600 kg/h. The waste generated is 2%. The lint to trash ratio is 60:40. The lint (in kg) accumulated in 8 hours, accurate to one decimal place, will be ...... 195. The twist contraction factor of a filament yarn is 1.06. For producing 5 ton twisted yarn of 50 tex, the untwisted yarn length required, in km, accurate to the nearest integer, is ......

196. For producing a coarse count yarn from short staple trashy cotton sliver, the most suitable rotor is (A) Large diameter rotor with narrow groove (B) Large diameter rotor with wide groove (C) Small diameter rotor with narrow groove (D) Small diameter rotor with wide groove 197. Draw texturising gives: a. superior degree of setting and poorer crimp resilience b. inferior degree of setting and better crimp resilience c. superior degree of setting and better crimp resilience 198. The increase in pro-comber draft; a. reduces the waste at comber b. increases the waste at comber c. does not change the comber waste 199. For synthetic fibre: a. heavier laps are preferred for finer denier fibre b. higher laps are preferred for coarse denier fibre c. lighter laps are preferred for finer denier fibre 200. Bigger rotor diameter a. reduces the yarn strength and improves the yarn uniformity b. increases the yarn strength and reduces the yarn uniformity c. increases the yarn strength and improves the yarn uniformity 201. Murata Air-jet spinning a. first nozzles twist the fibre bundle and second nozzle wraps the fibre b. first nozzles wrap the fibre bundle and second nozzle twist the fibre c. Both the nozzles twist the fibre bundle in opposite direction 202. Strength of rotor spun yarn is higher than a. ring spun yarn b. Air-jet yarn c. DREF yarn 203. Assembly winder is based on a. True twisting systems b. False twisting systems c. wrapping system 204. Packing density of ring spun yarn is a. low at yarn surface and more at yarn core b. more at yarn surface and low at yarn core c. uniform from yarn surface to core

205. Cerifil spinning system is used for a. Cotton fibre b. Synthetic fibre c. Wool fibre 206. Two for one twister is economical for a. Finer yarn plying b. Coarse yarn plying c. Blended yarn plying 207. The weight per meter of cotton sliver normally lies between a. 500 mg and 1000 mg b. 3 g and 4g c. 10 g and 15 g d. 40 g and 60g 208. The RKm of a yarn is equal to a. g/tex b. g/den c. Breaking length in Km d. CSP 209. The number of fibres in the cross-section of a 20s cotton yarn would be approximately a.85 b.170 c.340 d.680 210. Roller and clearer card is used for carding of a. Cotton b. Cotton waste c. Wool fibres d. Man-made fibres 211. The coaser fibres preferentially migrate a. To the surface of the yarn b. To the core of the yarn c. At random 212. Longer and finer fibres require a card cylinder having a. Higher wire point density b. Lower wire point density c. Higher speed 213. On the scutcher, the ratio of fan speed to beater speed required for synthetic fibres, as compared to cotton fibres, is a. Higher b. Lower c. Equal

214. On a good ring frame, the spinning tensions for cotton yarn would be around a.1.0 g/tex b.0.1 g/tex c.0.001 g/tex d.0.11 g/den 215. Balloon control rings are more effective a. At the end of the doff b. At the middle of the doff c. At the beginning of the doff d. Throughout the doff 216. If the difference between the number of thick and thin places is very high, the machine to be checked first would be a. Draw frame b. Speed frame c. Ring frame d. Card 217. The waste removed in blow room while processing man-made fibres should be around a. 0.1% b.1% c.2% d.3% 218. The traveler weight employed for polyester blend, compared to that employed for cotton is a. Less b. More c. The same 219.The most preferred bleater for processing man-made fibres is a. Shirley opener b. Kirschner beater c. Creighton d. Three bladed beater 220. False-twisting means a. twisting in the false direction b. not twisting c. introducing equal and opposite twist d. twisting with friction discs 221.Edge crimped yarns a. have zig-zag configuration b.have helical configuration c. give stretch yarns d.give modified stretch yarns

222. In the context of friction spindles for texturing, the twister angle should be a.30o b.45o c.60o d.90o 223. Air-jet texturing a.reduces the strength considerably b.does not decreases the strength c. uses overfeeding to get the textured effect d.uses air-jets to get the textural effect. 224. Stuffer-box technique a. is used to produce textural yarns for carpets b. can process heavy denier yarns c. is used to give crimps in staple fibre production d. is suitable for monofilaments 225. The ratio of fan to beater speed in the scutcher is higher when processing a. Cotton b. Man-and fibres c. None of the above 226. Longer and finer fibres would require a card cylinder having a. Higher wire point density b. Lower wire point density c. Greater wire height d. Lower speed 227. The reduction in nep level at the card comes through a. Crushing of neps between calendar rollers b. Removal of neps in the licker-in droppings c. Removal of neps in Flat strips d. Disentanglement of neps 228. As a guide line, the optimum level of comber waste should be a. equal to short fibre % b. twice the short fibre % c. 1.3 times the short fibre % d. 0.5 times the short fibre % 229. In the cotton system, the bobbin rail speed (cm/min), as the roving bobbin builds up, should a. increases b. decreases c. remains constant

230. Murata Jet Spinner has been commercially highly successful for yarns form a. Cotton b. Polyester and its blends c. Viscose cotton blends d. Wool 231. For excessive difference between the number of thick and thin places the process most likely to be responsible is a. Drawing b. Roving c. Ring spinning d. Carding 232. Uster classimat in for classifying a.Yarn faults b.Yarn imperfections c.Yarn irregularity 233. Tension in yarn during winding from bobbin depends on the unwinding speed is proportional to a.V b.V2 c.V3 234. Wind is defined as a. number of coils per traverse b. number of coils in double traverse c. number of grooves in the drum 235. In a mixing having 4% trash, the % of trash in the blow room dropping would be around____________ % 236. The 100% production of draw frame producing 2 k tex silver at 500 m/min is ___________ kgm/hr per delivery 237. The actual draft on a comber having a mechanical draft of 90 and waste % of 10 is _____________ 238. On a good Ring frame the spinning tension for cotton yarns should be around ____________ g/tex 239. The ____________ hooks are preferentially removed in roller drafting 240. The % cleaning efficiency of a cotton blow room line lies between a. 40 & 50 b. 50 & 60 c. 60 & 75 d. 80 & 95

241. The production rate of a card processing finer fibres is comparatively a. Less b. More c. Same d. Depends on fibre strength only 242. Compared to the lap, the nap level in the card silver should be a. Less b. More c. Same d. Zero 243. The weight in grams of one meter of cotton silver normally lies between a. 0.5 – 1.0 b. 1.0 – 2.0 c. 2.5 – 4.0 d. 6.5 – 10.0 244. The level of card waste is comparatively higher in a. Conventional flexible fillet card b. Semi-high production card c. High production card d. Modern super high production card 245. Rotor spinning has been most successful for spinning of a. Cotton b. Acrylic c. Viscose d. Polyester. 246. The twist in the roving made from finer fibres should be comparatively a. Same b. Higher c. Lower d. Zero 247. On classimate, the objectionable faults are a. A4, B4, C4, D4 b. B3, B4, D3, D4 c. C3, C4, D3, D4 d. A4, B4, C3, C4, D3, D4 248. Yarn tension during unwinding is proportional a. √tex b. tex c. √Ne d. Ne

249. The average tuft weight produced with UNIfloc is around a.30 - 50μg b. 30 -50 mg c. 2-4 g d. 10-20 g 250. In a card, the point-to-point action results in carding action on the fibres. However, the back-to-back action results in a. Stripping action b. Opening action c. Cleaning action d. Brushing action 251. Stationary flats are used at the back and front to a. Remove short fibres b. Reduce thin places in yarn c. Increase production d. Reduce neps 252. The level of spin finish (%) applied on grey 1.5 den x 38 mm polyester fibres is a.0.15 b.0.30 c.0.45 d.0.60 253. The spinning tension in g/tex in ring spinning is a.1.0 b.2.5 c.3.0 d.4.6 254. The maximum twist in rotor spinning is a. At the package b. In the radial portion of yarn inside the rotor c. In the p.t.e zone d. Just at the exit from the doffing tube 255. Air-jet yarn is weaker than a. Ring yarn b. Rotor yarn c. Friction yarn d. None of the above 256. The main purpose of mixing a large number of bales is to a. produce a stronger yarn b. get consistent yarn quality c. reduce waste d. improve cleaning efficiency 257. In the spinning of cotton waste, one uses a. andem cord b. condenser cord c. siral cord d. flat cord

258. The angle of licker-in wire for cording polyester should be around a.70o b.80o c.90o d.99o 259. The weight of five meters of finished sliver would normally lie between a. 2.5g and 5g b. 15g and 20g c. 100g and150g d. 200 and 300g 260. Drawframe blending is normally preferred for blend of a. polyester and viscose b. polyester and cotton c .polyester and acrylic d. acrylic and viscose 261. The 100% production(kg/hr) per delivery of a drawfrom producing 4ktex sliver at 500 m/min is a.60 b.80 c.100 d.120 262. The routing twist for finer fibres should be comparatively a. higher b. lower c. same 263. The spinning tension (9/tex) for cotton yarn would be around a.1.0 b.0.1 c.0.01 d.15.0 264. In ring spinning, the traveler rpm is a. equal to spindle rpm b. higher than spindle rpm c. lower than spindle rpm d. constant 265. The 2.5% span length of 25mm means that 2.5%of the clamped fibres are a. shorter than 25mm b.25 mm or longer c. equal to or shorter than 25 mm d.25mm in length 266. Murata Jet Spinner (MJS) has been commercially successful for spinning a. cotton-jute blend b. polyester and its blends c. viscose-cotton blend d. wool 267. Strongest 30 tex cotton yarn would be produced by a. rotor spinning b. air-jet spinning c. friction spinning 268. For trouble free spinning, the ratio of fibre length in cm to its denier should be a. 4.0 b. >4.0 c. 2.5 d. 1.0 269. In winding, optimum tension for 30 tex cotton yarn will be approximately a.5g b.10g c. 30g d. 60g 270. In case of a surface driven winding package, as the winding procedds, angle of wind a. increase b. decreases c. remains constant d. first increases and then decreases

271. The change in twist of yarn during over-end unwinding is a. more in case of smaller diameter package b. more in case of larger diameter package c. not dependent on package diameter 272. If mass variation in a yarn is distributed normally, which of the following relations hold good a. CV % >1.25 u % b. CV % = 1.25 u % c. CV % < 1.25 u % d. CV % = u % 273. To process acrylic staple one should use a. SRRL opener b. Krischner beater c. Air-jet cleaner d. Step cleaner 274. In a scutcher the calendar-roller pressure for viscose as compared to cotton fibres is a. Higher b. Lower c. Same d. Nil 275. Surface speed of cylinder in a card is lower than that of a. Doffer b. Licker-in c. Flats d. None of the above 276. The hooks which are preferentially removed in roller drafting are a. Trailing b. Leading c. ’U’ shaped d. Double 277. The roving twist used for longer fibres is a. Higher b. Lower c. Same 278. The ring traveler life is maximum for a. Viscose rayon fibres b. Cotton fibres c. Polyester fibres d. Acrylic staple fibres

279. The member of fibres of 1.5 denier in the cross-section of a Ktex sliver is a.18,000 b.20,000 c.2,000 d.200 280. 1. Yarn speed in cone winding 2. Yarn speed in sizing 3. Unwinding speed of Weft from shuttle eyeing 281 1. Bobbin 2. Ring traveller 3. Front drafting rollers 282. 1. Ring Spinning 2. Rotor Spinning 3. Friction Spinning

A. 800 m/min B. 1200 m/min C. 100 m/min

A.14700 rpm B.300 rpm C.15000 rpm

A. Spinning drums B. Twin disc C. Bolster/Inser

283. 1. Speed frame 2. Ring frame 3. Card

A. Flats B. Cone drums C. Ring traveller

284. 1. Filament 2. Roving 3. Yarn

A. Denier B. Count C. Hank

285. The blow room line for processing viscose rayon fibres, as compared to Processing cotton, has a. More number of beating points b. Less number of beating points c. Same number of beating points d. Beaters running at higher speeds 286. The cards reduces the short fibre % by a. 1-2 b.4-5 c.6-10 d. Zero 287. On a ring frame the spindle speed is 16,000 rpm. If the yarn twist is 8 turns/cm and Winding-on circumference is 5 cm, the traveler rpm would be a.14,998 b.15,000 c.16,600 d.15,600

288. The yarn strength expressed as RKM is equivalent to a. Grams per denier b. Grams per tex c. C S P d. Breaking load in grams 289. The norm for production in grams per spindle shift for 40s combed yarn is a.100 b.140 c.180 d.50 290. 1. Drawing 2. False twist texturing 3. Spin finish 291. 1. Cyclinder 2. Taker - in 3.Doffer

A. Bulk B. Friction C. Dimensional stability

A. 700 m/min B. 1500 m/min C. 100 m/min

292. 1. Short staple fibres 2. Long staple fibres 3. Short & long staple fibres

A. Rotor spinning B. Ring spinning C. Air-jet spinning

293. 1. Opening roller 2. Autoleveller 3. Noil

A. Drawframe B. Rotor frame C. Comber

294. 1. Ring frame 2. Rotor frame 3. Draw frame

A.900 m/min B.25 m/min C.200 m/min

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