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GATE Textile and Fiber Science
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GATE Textile and Fiber Science
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Ratio of grab strength to strip strength is the highest when fabric extension (%) is
10
15
5
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
140
100
80
120
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-3, R-1, S-4
P-2, Q-3, R-4, S-1
P-2, Q-1, R-3, S-4
P-1, Q-4, R-2, S-3
The spinning system that does not generate false twist during spinning is
Rotor spinning
Air jet spinning
DREF 3
Ring spinning
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
200
140
160
180
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
0.8
1.1
1.0
0.9
The range of spinning speed (m/min) used in the manufacture of partially oriented polyester yarn is
4000 − 6000
2000 − 2500
1000 − 1200
2800 − 3500
Consider the following Assertion [a] and Reason [r] [a] M is an orthogonal matrix, but not a skew-symmetricmatrix.
[r] Because MT = M−1 and MT ≠ −M.Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
[a] is right [r] is right
[a] is wrong [r] is right
[a] is wrong [r] is wrong
[a] is right [r] is wrong
On a mass based evenness tester, thin place in a yarn at −40 % setting is counted if mass per unit length is
60 % of the mean mass per unit length or less
40 % of the mean mass per unit length or less
40 % of the mean mass per unit length
60 % of the mean mass per unit length
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 polyester (%) in the final sliver is approximately
25
8
33
17
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 intermediatestep.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
[a] is right [r] is right
[a] is wrong [r] is wrong
[a] is right [r] is wrong
[a] is wrong [r] is right
In the context of thermal bonding of nonwoven web, the statement which is not true is
A thermoplastic component has to be present in the web
Chemical reaction takes place
Heat is applied until the thermoplastic component melts
The polymer flows by surface tension and capillary action to fibre cross over points
Fabric abrasion resistance cannot be assessed by the loss in
strength
Air permeability
Thickness
Weight
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 ________
1200
300
600
900
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
10
200
55
20
Softener reduces the bending rigidity of fabrics by decreasing
Modulus of the fibres
Packing coefficient of yarns
Inter-fibre and inter-yarn friction
Glass transition temperature of the fibres
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 majorproblem.
[r] In an alkaline medium, the reactive dye reacts with the hydroxyl groups irrespective of whether these are from cellulose orwater.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
[a] is right [r] is right
[a] is wrong [r] is right
[a] is wrong [r] is wrong
[a] is right [r] is wrong
A fabric is woven from 38 tex yarns of 0.65 packing coefficient and 1.54 g/cm3 fibredensity.
The fabric has 30 ends per cm and 25 picks per cm. Assume that warp isjammed.
The thickness of the above fabric (mm) is approximately
0.50
0.75
0.05
0.25
Consider the following Assertion [a] and Reason [r] [a] In the case of manufactured fibre spinning, a circular spinneret orifice always results in circular cross-section of filaments in melt spinning, but the same is not true in dryspinning.
[r] Melt spinning involves only heat transfer, whereas dry spinning involves heat as well as masstransfer.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
[a] is wrong [r] is wrong
[a] is right [r] is wrong
[a] is right [r] is right
[a] is wrong [r] is right
The factor that does not influence the propelling force for moving the weft yarn on air jet loom is
Air velocity
Coefficient of friction between air and yarn
Yarn diameter
Yarn strength
Bleached cotton fabric was sent to a laboratory for determination of Copper Number, which is an estimate of the presence of
Carboxyl groups
Hydroxyl groups
Reducing groups
Oxidizing groups
The strength utilization of yarn in a woven fabric is
Always equal to 1.0
Always more than 1.0
Always less than 1.0
Either more or less than 1.0
An eccentric top roller in a drafting system leads to
Oscillation of nip line only
Change in draft with oscillation of nip line
Change in draft without oscillation of nip line
Neither change in draft nor oscillation of nip line
Sizing of single cotton yarn leads to an increase in
Strength and extensibility but decrease in bending rigidity and hairiness
Strength and hairiness but decrease in extensibility and bending rigidity
Strength and bending rigidity but decrease in extensibility and hairiness
Bending rigidity and extensibility but decrease in strength and hairiness
The chemical that is used to convert soda cellulose to sodium cellulose xanthate in the manufacture of viscose rayon is
Sodium hydroxide
Sodium sulphide
Sodium xanthate
Carbon disulphide
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
36
39
46
41
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 wrong [r] is right
[a] is right [r] is right
[a] is right [r] is wrong
[a] is wrong [r] is wrong
The increase in traveller weight leads to an increase in
Traveller lag
Yarn tension
Balloon diameter
Yarn twist
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
210
190
200
180
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 distilledwater.
This process is repeated five moretimes.
The final concentration of the solution is
c(1/2)7
c(1/2)5
C
c(1/2)6
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