Gate Solved Papers Part-II | Tf-Gate 1992
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21. The coarser fibers preferentially migrate
To the surface of the yarn.
To the core of the yarn.
At random.
Ans: 1
22. Longer and finer fibers require a card cylinder having
Higher wire point density.
Lower wire point density.
Higher speed
Ans: 1
23. On the scutcher the ratio of fan speed to beater speed required for synthetic fibers as compared to cotton fibers is
Higher
Lower
Equal
Ans: 1
24. On a good ring frame, the spinning tensions for cotton yarn would be around.
1.0 g/tex
0.1 g/tex
0.001 g/tex
0.11 g/tex
Ans: 1 & 4
25. Balloon control rings are more effective
At the end of the doff
At the middle of the doff
At the beginning of the doff
Throughout the doff
Ans: 4
26. If the difference between the number of thick and thin places is very high, the machine to be checked first would be
Draw frame
Speed frame
Ring frame
Card
Ans: 4
27. The waste removed in the blow room while processing man-made fibers should be around
0.1%
1%
2%
3%
Ans: 2
Avg is 0.5% to 1%
28. The amount of spin flash applied by fiber manufacturers to polyester staple is around.
0.16%
0.48%
1.0%
5%
Ans: 1
29. The traveler weight employed for polyester blend, compared to that employed for cotton is
Less
More
The same
Ans: 1
30. The most Preferred beater for processing man-made fibers
Shirley opener
Kirschner beater
Creighton
Three bladed beater
Ans: 1
31. During sizing pickup will increase if
Sizing speed increases
Squeezing pressure increase
The position of the immersion roller is lowered
Temperature of drying cylinder decreases
Ans: 1 & 3
32. Fabric cover on a loom is improved by
Raising the backrest
Having early shedding
Having late pickup
None of the above
Ans: 2
33. Activation of bottom change on an automatic loom is preferred by weft feeler compared to weft fork because
It increases the loom efficiency
It improves the quality of fabric
It reduces the weft waste
It reduces the workload of workers.
Ans: 3
34. In shuttle less weaving, weft waste is minimum on
Air-jet loom
Water-jet loom
Rapier loom
Gripper (or projectile) loom
Ans: 1
35. On Sulzer projective loom, the number of projectiles depends on
Weight of projectile
Width of loom
Speed of loom
Picking force
Ans: 2
36. Circular looms are preferred over conventional looms
When the weft pattern is complicated
When the silk yarn is involved
When hose type of fabric is required
Because circular looms give higher efficiency
Ans: 3
37. In triaxial weaving weft is inserted
In single picks
In double picks
By two pick cycle
None of the above
Ans: 1
38. Gauge of winder with trap type(serrated) slub catcher for 25 tex yarn will be
0.1-0.2 m
0.6-0.7mm
1.0-1.3mm
Ans: 2
For combed 1.5-2 times of yarn dia.
For carded 2-2.5 times of yarn dia.
39. Percent waste in sizing department calculated on the yarn processed in the sizing is normally
0.5-0.8%
1.2-1.5%
2.0-2.5%
Ans: 2
40. If the specific volume and twist factor of yarn are 1.0 cm3 /g and 60 tex1/2 turns/cm respectively, what will be its twist angle?
30o
34o
32o
None of the above
Ans: 2
Tan α = 0.0112 (1.0 cm3/g)1/2 x 60
= 0.672
α = tan‑1 (0.672)
= 33.9o
41. The value of the retraction factor ranges between
0 to ∞
1 to ∞
0 to 1
Has no range
Ans: 3
42. If the ratio of the strength of two-fold yarn to its component single yarn is four, what will be the ratio of their tenacities?
4
2
1
None of the above
Ans: 2
43. Which of the following relationships is correct
ef = ey cos2 Θ
Ey = Ef cos2 α
ef = ey / cos2 Θ
Ey = Ef Cos2 α = Ef
Where Ey =Yarn Modulus
Ef =Fibre modulus
α = Helix angle at yarn surface
ey = yarn extension
ef = fibre elongation
Θ = Helfix angle of fibre
Ans: a & C
44. The index of Blend irregularity (IBI) values proposed by Coplan and Klein may have the following interpretation
IBI = 0, means complete randomness
IBI =1, means perfect blending
IBI > 1, means the presence of clustering
IBI = 0, means perfect blending
Ans: 3
45. Drawing
Increases crystallinity
Increases birefringence
Decreases crystallinity
Increase strength
Ans: 1, 2, & 4
46. Nylon is drawing
At glass transition temperature.
At softening temperature
At room temperature
At 100% RH conditions
Ans: 4
47. The denier of tow used for producing polyester staple fibers before the drawing is about
3000
30,000
300,000
None of the above
Ans: 2
48. Heat setting in relaxed conditions
Reduces strength
Increases orientation
Increases crystallinity
Increases density
Ans: 1, 3 & 4
49. False twist means
Twisting in a false direction
Not twisting
Introducing equal and opposite twist
Twisting with friction discs
Ans: 3
50. Edge crimped yarns
Have zig-zag configuration
Have helical configuration
Give stretch yarns
Give modified stretch yarns
Ans: 4
51. In the context of friction spindles for texturing the twister angle should be
30o
45o
60o
90o
Ans: 4
52. Air-jet Texturing
Reduces the strength considerably
D