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GATE Textile and Fiber Science
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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
0.84
0.89
0.99
0.94
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
41
39
36
46
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
200
20
10
55
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 breakerdrawframe.
Two slivers from breaker drawframe are further drawn along with the four cotton carded slivers keeping a draft of 6 on a finisherdrawframe.
The mass CV (%) of the final sliver is approximately
0.6
2.33
1.24
1.86
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 thefabric.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
[a] is right [r] is wrong
[a] is right [r] is right
[a] is wrong [r] is wrong
[a] is wrong [r] is right
Yarns Y1 and Y2 have the same strength when tested at 200 mm gaugelength.
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
Equal to 1.0
Less than 1.0
Either more or less than 1.0
More than 1.0
The terry towel fabric is a
Weft pile structure with two series of weft and one series of warp yarn
Warp pile structure with two series of weft and one series of warp yarn
Warp pile structure with two series of warp and one series of weft yarn
Weft pile structure with two series of warp and one series of weft yarn
The weight of material on a roving bobbin is 2.4 kg. The roving hank is 600tex.
If delivery rate is 20 m/min, the time (min) required to build the bobbin is
200
210
180
190
Consider the following assertion [a] and reason [r] in the context of the load-elongation curves of fibres F1, F2, and F3[a] Fibre F3 is the most suitable fibre for making a rope formountaineering.
[r] Mountaineering rope should have high tenacity, high modulus and high work ofrupture.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
[a] is wrong [r] is right
[a] is right [r] is wrong
[a] is right [r] is right
[a] is wrong [r] is wrong
Match the property from Group I with the characterization technique from Group
II.Group I Group IIP Spherulite size 1 Optical microscopyQ Degradation temperature 2 X-ray diffractionR Crystalline orientation 3 Differential scanning calorimetryS Melting temperature 4 Thermogravimetric analysis
P-2, Q-1, R-3, S-4
P-2, Q-3, R-4, S-1
P-2, Q-3, R-1, S-4
P-1, Q-4, R-2, S-3
Fabric abrasion resistance cannot be assessed by the loss in
strength
Thickness
Weight
Air permeability
Ratio of grab strength to strip strength is the highest when fabric extension (%) is
15
5
10
The factor that does not influence the propelling force for moving the weft yarn on air jet loom is
Coefficient of friction between air and yarn
Yarn diameter
Yarn strength
Air velocity
The increase in traveller weight leads to an increase in
Yarn twist
Traveller lag
Yarn tension
Balloon diameter
An eccentric top roller in a drafting system leads to
Change in draft with oscillation of nip line
Neither change in draft nor oscillation of nip line
Change in draft without oscillation of nip line
Oscillation of nip line only
The range of spinning speed (m/min) used in the manufacture of partially oriented polyester yarn is
1000 − 1200
2000 − 2500
4000 − 6000
2800 − 3500
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
140
200
180
160
Most of the seed coat particles are removed in
Draw frame
Card
Blow room
Comber
The spinning system that does not generate false twist during spinning is
DREF 3
Air jet spinning
Rotor spinning
Ring spinning
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
1.1
1.0
0.8
0.9
1
2
3
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