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Q.1 The fibre which has a mineral origin is
(A) Asbestos (B) Silk (C) Flax (D) Acrylic
Q.2 The chemical that is used to convert soda cellulose to sodium cellulose xanthate in the manufacture
of viscose rayon is
(A) Carbon disulphide (B) Sodium xanthate
(C) Sodium sulphide (D) Sodium hydroxide
Q.3 The fibre that will float on water is
(A) Nylon (B) Polyester (C) Acrylic (D) Polypropylene
Q.4 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
Q.5 Drawing of synthetic filament does not lead to an increase in
(A) Crystallinity (B) Tenacity
(C) Tensile modulus (D) Elongation at break
Q.6 In a card, the wire point density is maximum on
(A) Cylinder (B) Flat (C) Doffer (D) Licker-in
Q.7 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
Q.8 Most of the seed coat particles are removed in
(A) Blow room (B) Card (C) Comber (D) Draw frame
Q.9 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
Q.10 The increase in traveller weight leads to an increase in
(A) Yarn twist
(B) Traveller lag
(C) Balloon diameter
(D) Yarn tension
Q.11 Dog knot is preferred to weaver's knot during creeling because it is
(A) Easier to make
(B) Stronger
(C) Smaller in size
(D) Less prone to slippage

Q.12 Size add-on does not depend on
(A) Roller hardness
(B) Drying cylinder temperature
(C) Size paste concentration
(D) Machine speed
Q.13 Ball warping is mainly used in the manufacture of
(A) Terry towel
(B) Narrow fabric
(C) Denim
(D) 3D fabric
Q.14 The factor that does not influence the propelling force for moving the weft yarn on air jet loom is
(A) Coefficient of friction between air and yarn
(B) Air velocity
(C) Yarn strength
(D) Yarn diameter
Q.15 In the context of thermal bonding of nonwoven web, the statement which is not true is
(A) A thermoplastic component has to be present in the web
(B) Heat is applied until the thermoplastic component melts
(C) The polymer flows by surface tension and capillary action to fibre cross over points
(D) Chemical reaction takes place
Q.16 A 51 mm long fibre has 6 % crimp. The crimped length of the fibre in mm is approximately
(A) 44 (B) 46 (C) 48 (D) 50
Q.17 On a mass based evenness tester, thin place in a yarn at −40 % setting is counted if mass per unit
length is
(A) 40 % of the mean mass per unit length
(B) 60 % of the mean mass per unit length
(C) 40 % of the mean mass per unit length or less
(D) 60 % of the mean mass per unit length or less
Q.18 Ratio of grab strength to strip strength is the highest when fabric extension (%) is
(A) 0 (B) 5 (C) 10 (D) 15
Q.19 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
(A) 1.1 (B) 1.0 (C) 0.9 (D) 0.8
Q.20 Fabric abrasion resistance cannot be assessed by the loss in
(A) Strength (B) Thickness (C) Weight (D) Air permeability
Q.21 Bleached cotton fabric was sent to a laboratory for determination of Copper Number, which is an
estimate of the presence of
(A) Hydroxyl groups (B) Carboxyl groups
(C) Reducing groups (D) Oxidizing groups

Q.22 Malachite Green is an important dyestuff. The typical green colour is obtained when the dye
molecule is
(A) Nonionic
(B) Cationic
(C) Anionic
(D) Made up of phenyl groups
Q.23 A typical curve between equilibrium dye uptake and dyeing temperature goes through a maximum.
After the maximum, the dye uptake decreases because
(A) Kinetic energy increases rapidly
(B) Pressure in the dye bath increases
(C) Saturation value is reached
(D) Dyeing is an exothermic process
Q.24 The efficacy of the wash-n-wear treatment can be estimated by measuring its
(A) Bending length
(B) Tensile strength
(C) Dye uptake
(D) Crease recovery
Q.25 Softener reduces the bending rigidity of fabrics by decreasing
(A) Inter-fibre and inter-yarn friction
(B) Modulus of the fibres
(C) Glass transition temperature of the fibres
(D) Packing coefficient of yarns


Q.26 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 ________.
Q.27 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 ________.
Q.28 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 ________.
Q.29 A 225 denier viscose yarn has a breaking strength of 7.5 N. The yarn tenacity in cN/dtex is
________.

Q.30 In 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 ________.

Q.33 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
(A) 9 (B) 17 (C) 22 (D) 33
Q.34 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
(A) e−6.45 (B) e6.45 (C) e−645 (D) e645
Q.35 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
(A) 2.40 (B) 2.80 (C) 3.20 (D) 3.36
2012 TEXTILE ENGG. & FIBRE SCIENCE – TF
TF 6/9
Q.36 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 Thermogravimetric analysis
(A) P-2, Q-3, R-1, S-4 (B) P-2, Q-3, R-4, S-1
(C) P-1, Q-4, R-2, S-3 (D) P-2, Q-1, R-3, S-4
Q.37 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 dry spinning.
[r] Melt spinning involves only heat transfer, whereas dry spinning involves heat as well as mass
transfer.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
(A) [a] is right [r] is wrong
(B) [a] is right [r] is right
(C) [a] is wrong [r] is right
(D) [a] is wrong [r] is wrong
Q.38 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 for mountaineering.
[r] Mountaineering rope should have high tenacity, high modulus and high work of rupture.
Determine the correctness or otherwise of the above Assertion [a] and Reason [r]
(A) [a] is right [r] is wrong
(B) [a] is right [r] is right
(C) [a] is wrong [r] is right
(D) [a] is wrong [r] is wrong
Q.39 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
Load
Elongation
F1
F2
F3

Q.40 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
Q.41 The terry towel fabric is a
(A) Warp pile structure with two series of warp and one series of weft yarn
(B) Weft pile structure with two series of warp and one series of weft yarn
(C) Warp pile structure with two series of weft and one series of warp yarn
(D) Weft pile structure with two series of weft and one series of warp yarn
Q.42 Sizing of single cotton yarn leads to an increase in
(A) Strength and extensibility but decrease in bending rigidity and hairiness
(B) Strength and bending rigidity but decrease in extensibility and hairiness
(C) Strength and hairiness but decrease in extensibility and bending rigidity
(D) Bending rigidity and extensibility but decrease in strength and hairiness
Q.43 The strength utilization of yarn in a woven fabric is
(A) Always more than 1.0 (B) Always less than 1.0
(C) Always equal to 1.0 (D) Either more or less than 1.0
Q.44 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
(A) More than 1.0 (B) Less than 1.0
(C) Equal to 1.0 (D) Either more or less than 1.0
Q.45 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]
(A) [a] is right [r] is wrong
(B) [a] is right [r] is right
(C) [a] is wrong [r] is right
(D) [a] is wrong [r] is wrong
Q.46 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]
(A) [a] is right [r] is wrong
(B) [a] is right [r] is right
(C) [a] is wrong [r] is right
(D) [a] is wrong [r] is wrong

Q.47 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]
(A) [a] is right [r] is wrong
(B) [a] is right [r] is right
(C) [a] is wrong [r] is right
(D) [a] is wrong [r] is wrong
Common Data Questions
Common Data for Questions 48 and 49:
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.
Q.48 The polyester (%) in the final sliver is approximately
(A) 8 (B) 17 (C) 25 (D) 33
Q.49 The mass CV (%) of the final sliver is approximately
(A) 0.6 (B) 1.24 (C) 1.86 (D) 2.33
Common Data for Questions 50 and 51:
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.
Q.50 The weft crimp (%) is approximately
(A) 0 (B) 5 (C) 10 (D) 15
Q.51 The thickness of the above fabric (mm) is approximately
(A) 0.05 (B) 0.25 (C) 0.50 (D) 0.75

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