40 % of the mean mass per unit length
1.60 % of the mean mass per unit length
2.40 % of the mean mass per unit length or less
3.40 % of the mean mass per unit length or less
4.60 % of the mean mass per unit length or less
A 51 mm long fibre has 6 % crimp. The crimped length of the fibre in mm is approximately
1.44
2.46
3.48
4.50
A fabric is woven from 38 tex yarns of 0.65 packing coefficient and 1.54 g/cm3 fibre density. The fabric has 30 ends per cm and 25 picks per cm. Assume that warp is jammed. The weft crimp (%) is approximately
1.0
2.10
3.15
4.20
A yarn of 24 mm length has a varying cross-section. The values of the cross-sectional area of yarn (mm2), measured at equal intervals of 4 mm from one end are 0.09, 0.12, 0.14, 0.15, 0.16, 0.13, 0.11 The volume of yarn (mm3) estimated by using Simpson's 1/3 rule of numerical integration is
1.2.40
2.2.80
3.3.20
4.3.36
Ball warping is mainly used in the manufacture of
1.Terry towel
2.Narrow fabric
3.Denim
4.3D fabric
Dog knot is preferred to weaver's knot during creeling because it is
1.Easier to make
2.Stronger
3.Smaller in size
4.Less prone to slippage
Fabric abrasion resistance cannot be assessed by the loss in
1. Strength
2.Thickness
3.Weight
4.Air permeability
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 breaker drawframe. Two slivers from breaker drawframe are further drawn along with the four cotton carded slivers keeping a draft of 6 on a finisher drawframe. The mass CV (%) of the final sliver is approximately
1.0.6
2.1.24
3.1.86
4.2.33
In the context of thermal bonding of nonwoven web, the statement which is not true is
1.A thermoplastic component has to be present in the web
2.Heat is applied until the thermoplastic component melts
3.The polymer flows by surface tension and capillary action to fibre cross over points
4.Chemical reaction takes place
Malachite Green is an important dyestuff. The typical green colour is obtained when the dye molecule is
1.Nonionic
2.Cationic
3.Anionic
4.Made up of phenyl groups
Size add-on does not depend on
1.Roller hardness
2.Drying cylinder temperature
3.Size paste concentration
4.Machine speed
Sizing of single cotton yarn leads to an increase in
1.Strength and extensibility but decrease in bending rigidity and hairiness
2.Strength and bending rigidity but decrease in extensibility and hairiness
3.Strength and hairiness but decrease in extensibility and bending rigidity
4. Bending rigidity and extensibility but decrease in strength and hairiness
Softener reduces the bending rigidity of fabrics by decreasing
1.Inter-fibre and inter-yarn friction
2.Modulus of the fibres
3.Glass transition temperature of the fibres
4.Packing coefficient of yarns
The factor that does not influence the propelling force for moving the weft yarn on air jet loom is
1.Coefficient of friction between air and yarn
2. Air velocity
3.Yarn strength
4.Yarn diameter
The fibre which has a mineral origin is
1.Asbestos
2.Silk
3.Flax
4.Acrylic
The terry towel fabric is a
1.Warp pile structure with two series of warp and one series of weft yarn
2.Weft pile structure with two series of warp and one series of weft yarn
3.Warp pile structure with two series of weft and one series of warp yarn
4.Weft pile structure with two series of weft and one series of warp yarn
The thermal conductivity of a nonwoven fabric is given by λ = 0.03 + 0.00005à+ 0.15/àwhere λ is the thermal conductivity of the fabric in W/(mâ‹…K), àis the bulk density of the fabric in kg/m3, and ÃÂ∈[10,200]. The minimum value of thermal conductivity, in mW/(mâ‹…K), is approximately
1.36
2.39
3.41
4.46
. Ratio of grab strength to strip strength is the highest when fabric extension (%) is
1.0
2.5
3.10
4.15
A 225 denier viscose yarn has a breaking strength of 7.5 N. The yarn tenacity in cN/dtex is ________.
1.5
2.1
3.7
4.3
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 distilled water. This process is repeated five more times. The final concentration of the solution is
1. c
2.c(1/2)5
3. c(1/2)6
4.c(1/2)7
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
1.0.84
2. 0.89
3.0.94
4.0.99
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
1.80
2.100
3.120
4.140
A fabric is woven from 38 tex yarns of 0.65 packing coefficient and 1.54 g/cm3 fibre density. The fabric has 30 ends per cm and 25 picks per cm. Assume that warp is jammed. The thickness of the above fabric (mm) is approximately
1.0.05
2.0.25
3.0.50
4.0.75
A typical curve between equilibrium dye uptake and dyeing temperature goes through a maximum. After the maximum, the dye uptake decreases because
1.Kinetic energy increases rapidly
2.Pressure in the dye bath increases
3.Saturation value is reached
4.Dyeing is an exothermic process
An eccentric top roller in a drafting system leads to
1.Change in draft with oscillation of nip line
2.Change in draft without oscillation of nip line
3.Neither change in draft nor oscillation of nip line
4.Oscillation of nip line only
Assume that the rate of evaporation of moisture from a wet fabric during drying process is proportional to the amount of moisture present in the fabric. If 50 % of the moisture is evaporated in the first 5 minutes then the time (min) taken to evaporate 90 % of the moisture is approximately
1.9
2.17
3.22
4.33
Bleached cotton fabric was sent to a laboratory for determination of Copper Number, which is an estimate of the presence of
1.Hydroxyl groups
2.Carboxyl groups
3.Reducing groups
4.Oxidizing groups
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
2.1.0
3. 0.9
4. 0.8
Cleaning efficiency of the opening roller in a rotor spinning machine, having 56 mm diameter rotor, is 80 %. The yarn breaks when the trash deposition within the rotor groove 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 ________.
1.1
2.2
3.3
4.4
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 intermediate step. Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
1.[a] is right [r] is wrong
2.[a] is right [r] is right
3.[a] is wrong [r] is right
4.[a] is wrong [r] is wrong
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 major problem. [r] In an alkaline medium, the reactive dye reacts with the hydroxyl groups irrespective of whether these are from cellulose or water. Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
1.a] is right [r] is wrong
2.[a] is right [r] is right
3.[a] is wrong [r] is right
4.[a] is wrong [r] is wrong
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 the fabric. Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
1.[a] is right [r] is wrong
2.[a] is right [r] is right
3.[a] is wrong [r] is right
4.[a] is wrong [r] is wrong
Drawing of synthetic filament does not lead to an increase in
1.Crystallinity
2.Tenacity
3.Tensile modulus
4.Elongation at break
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 breaker drawframe. Two slivers from breaker drawframe are further drawn along with the four cotton carded slivers keeping a draft of 6 on a finisher drawframe. The polyester (%) in the final sliver is approximately
1.8
2.17
3.25
4.33
In a card, the wire point density is maximum on
1.Cylinder
2.Flat
3.Doffer
4.Licker-in
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 ________.
1.300
2.600
3.900
4.1200
Match the property from Group I with the characterization technique from Group II. Group I Group II P Spherulite size 1 Optical microscopy Q Degradation temperature 2 X-ray diffraction R Crystalline orientation 3 Differential scanning calorimetry S Melting temperature 4 Thermo gravimetric analysis
1.P-2, Q-3, R-1, S-4
2.P-2, Q-3, R-4, S-1
3.P-1, Q-4, R-2, S-3
4. P-2, Q-1, R-3, S-4
Most of the seed coat particles are removed in
1.Blow room
2.Card
3.Comber
4.Draw frame
n an experiment, 1 g each of the mercerized and unmercerized fabric samples are separately treated in 30 ml of 0.25N barium hydroxide solution for the required time. 10 ml of these solutions are drawn and titrated against 0.1N HCl solution. The volumes of HCl consumed at the end of these titrations are m for mercerized and u for unmercerized cases. If Barium Activity Number (BAN) = [(b-m)/(b-u)]*100, where m=18 ml, u=20 ml and b is the volume of HCl consumed in the blank titration, then the BAN value for the above mercerized sample is ________.
1.120
2.140
3.160
4.180
The chemical that is used to convert soda cellulose to sodium cellulose xanthate in the manufacture of viscose rayon is
1.Carbon disulphide
2.Sodium xanthate
3.Sodium sulphide
4.Sodium hydroxide
The density of a given polyester filament sample is 1.38 g/cm3. Consider the density of fully crystalline polyester as 1.455 g/cm3 and that of fully amorphous polyester as 1.335 g/cm3. The percent crystallinity of the sample is ________.
1.48 to 49
2.30 to 31
3.39 to 40
4. 41 to 42
The efficacy of the wash-n-wear treatment can be estimated by measuring its
1.Bending length
2.Tensile strength
3.Dye uptake
4.Crease recovery
The fibre that will float on water is
1.Nylon
2.Polyester
3.Acrylic
4.Polypropylene
The increase in traveller weight leads to an increase in
1. Yarn twist
2.Traveller lag
3. Balloon diameter
4.Yarn tension
The number of neps in a carded web follows Poisson distribution with a mean of 100 per m2. The probability that there is no nep in an area of 645 cm2 is
1.e-6.45
2.e6.45
3.e-645
4.e645
The range of spinning speed (m/min) used in the manufacture of partially oriented polyester yarn is
1.1000 − 1200
2.2000 − 2500
3.2800 − 3500
4.4000 − 6000
The spinning system that does not generate false twist during spinning is
1. Ring spinning
2.DREF 3
3. Rotor spinning
4.Air jet spinning
The strength utilization of yarn in a woven fabric is
1.Always more than 1.0
2.Always less than 1.0
3.Always equal to 1.0
4.Either more or less than 1.0
The thermal conductivity of a nonwoven fabric is given by λ = 0.03 + 0.00005à+ 0.15/àwhere λ is the thermal conductivity of the fabric in W/(mâ‹…K), àis the bulk density of the fabric in kg/m3, and ÃÂ∈[10,200]. Thermal conductivity is minimum when the bulk density is approximately
1.10
2.20
3.55
4.200
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 180
1.180
2.190
3.200
4.210
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
1.140
2.160
3.180
4.200
Which one of the following options is the closest in meaning to the word given below? Pacify
1.Excite
2.Soothe
3.Deplete
4.Tire
Yarns Y1 and Y2 have the same strength when tested at 200 mm gauge length. 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
1.More than 1.0
2.Less than 1.0
3.Equal to 1.0
4.Either more or less than 1.0