1991

1. Range of Maturity Ratio (M) of cotton is :

i. 0 to 1 ii.0 to 100 iii.0.2 to 1.2 iv.0.5 to 1.5

2. If d is the diameter, the rate of air flow through a fibre plug during fibre fineness
measurement will be propositional to

i. d ii.d2 iii.d4 iv.1/d2

3. If 6 slivers each having CV(%) of 6 are doubled, the CV(%d) of the resultant silver
will be

i. √6 ii. 6 iii. 12 iv.25

4. A 36s cotton yarn with a twist multiplier of 3.5 will have

i.18 tpi ii.21 tpi iii.30 tpi iv.36 tpi

5. When twist is increased in a spun yarn, its strength

i. increases ii. decreases iii. does not change

iv. first increases and then decreases

6. In a tensile test, if the strain rate is increased, the apparent tensile strength of a ring
spun yarn will

i. increases ii. decreases iii. not change iv. show no trend

7. Standard CSP value for a combed cotton yarn is

i.1,850 ii.2,000 iii.2,250 iv.2,800

8. With an increase in the friction between the yarns, the tear strength of a fabric will

i. increases ii. decreases iii. not change iv. show no trend

9. Air permeability of fabrics is generally measured with a pressure drop across fabrics
equivalent to the water head of

i.1 mm ii.10 mm iii.10 cm iv.1 m

10. If T is the thermal insulation of each layer of fabric, the thermal insulation of the
two layers of the fabrics together will be

i. greater than 2T ii. equal to 2T iii. less than 2T

11.Indigosal O is suitable for wool since.

i. it has good affinity for this fibre

ii. it can be applied from an alkaline bath
iii. it can be developed by means of acidified sodium nitrite.

12.Solamine Black is

i. a mineral colour ii. an oxidation iii. a pigment

13.Astrazon Blue GL is recommended.

i. for dyeing acrylic fabrics with a light fastness of 7-8

ii. for dyeing polyester iii. for mass colouration of polypropylene

1.4 O-Nitrodiphenyl amine disperse dyes have better light fastness due to

i. the presence of intermolecular hydrogen bonding

ii. resonance stabilization iii. stronger dye-fibre interaction.

2.Fill in the blanks:

1. The density of polypropylene in _______________ and that of viscose is _________.

2. Friacetatic fibres are soluble in __________ and _________ at room temperature.

3. ____________ is an example of a leaf fibre while__________ is a seed fibre.

4. The protein in wool is known as ______________ while that in silk as __________.

5. The initial modulus of PET is generally _________ than viscose while the elongation

at break is _________ than viscose.

6. At standard conditions the moisture regain values of acotate and acrylic fibres are
____________ and ___________ respectively.

7. The term degumming is associated with__________ fibre while retting with

________ fibres.

8. ____________ and __________ are the monomers for PET.

9. The end groups in PET are __________while in nylon are___________.

10. The glass transition temperatur of nylon G is ___________ in dry static

and_______ in water.
 1992

I. Write all the correct answers ( write only the alphabets e.g. A,B,C, or C,B)

1. During length measurement on Fibrograph,2.5% span length was found

to be 25 mm. It means

a.2.5% of fibres clamped are 25 mm is length

b.2.5% of fibres clamped are longer than 25 mm
c.2.5% of fibres clamped are 25 mm or longer
d.2.5% of fibres clamped are less than 25 mm

2. The count of a yarn is 20 Tex. It is equivalent to a yarn of

a. 29.5 Ne (English count) b.180 Denier

c. 50 Nm(Metric count) d. None of the above

3. The resultant count of a two folt cotton yarn is 16s Ne. If the doubling process
causes a contraction of 10% in the component yarns, the count of the component
single yarn will be

a. 35.2s Ne b. 28.8 s Ne c. 32 s Ne d.None of the above

4. The number of thin places were detected at -30% and -50% thin place settings on a
uster imperfection indicator.The incidence will be higher at

a. -30% b. 505 c. None of the above

5. Under CRL and CRE conditions of testing, what happens to the rate of loading
when length of specimen is increased?

a. Rate of loading does not change for CRL condition

b. Rate of loading decreases for CRE condition
c. Rate of loading increases for both the conditions
d. None of the above

6. With respect of tear strength which of the following statements are correct?

a. Tear strength of twill weave > Tear strength of plain weave

b. Tear strength of high set fabric < Tear strength of low set fabric
c. Tear strength does not depend upon weave and set
d. Tear strength depends upon thread strength

8. Which of the following phenomenon may be described by Poisson Distribution/

a. Number of warp breakages on a loom

b. Breaking load of yarn c. Number of neps in a given area of card web
d. Number of end breakages in ring spinning
 8. The correct relationship between specific surface (s) and diameter (d) of a fibre
can be described by
1 4 Perimeter of Cross-Section
a. s = b. s = c. s =
d d Area of Cross-Section

d. None of the above

9. The standard error of estimate of difference of two means having sample size of n1
and n2 and pooled estimate of standard deviation s, is

1 1 1 1 1 1
a. + b. + c. +
n1 n2 2 n1 2 n2 n1 n2

d. None of the above

10. Which of the following relationships is /are correct?

µg
a. Denier x 2.82 = c. Denier x 1.11 = Decitex
inch

µg/inch
b. Denier x 2.82 = d. Denier x 0.111 = Tex
2.56

II. Write all the correct answers (e.g. A,B, or C,D etc)

11. The U % of single yarn is 17.3%. The expected U% of a 3 ply yarn made form these
single yarn would be
i.12.5 ii.10.0 iii.17.3 iv. None of the above

12. The weight per meter of cotton sliver normally lies between

i. 500 mg and 1000 mg ii. 3 g and 4g

iii.10 g and 15 g iv. 40 g and 60g

13. The RKm of a yarn is equal to

i. g/tex ii. g/den iii. Breaking length in Km iv. CSP

 14. The number of fibres in the cross-section of a 20s cotton yarn would be
approximately

i.85 ii.170 c.340 d.680

15. Roller and clearer card is used for carding of

i. Cotton ii. Cotton waste iii. Wool fibres iv. Man-made fibres

16. Sectional warping is considered more practical than beam warping

i. For executing big orders ii. For producing striped fabrics

iii. When sizing is considered necessary
iv. When two fold yarn has to be used in warp and weft

17. Sizing gives to the yarn

i. Higher breaking strength ii. Increased elongation at bread
iii. Increased pliability iv. None of the above

18. 1 kg of 20 Ne will have a length of

i.16,800 yds ii.33,600 meters iii.20,000 meters iv.16,800 meters

19. A sheeting fabric having 30 tex in warp and 20 tex in weft, and having 40x30
ends and picks per centimeter respectively

i. 90 g/m2 ii. 170 g/m2

iii.180 g/m2 iv. 250 g/m2

20. In a automatic loom

i. Weft-break is repaired automatically

ii. Warp-break is repaired automatically
iii. Exhausted weft bobbin is replaced automatically
iv. Exhausted warp beam is replaced automatically

PART – B

Section A
Attempt all questions
III. Write all the correct answers (write only the alphabets e.g. A,B or B etc)

21. The coaser fibres preferentially migrate

i. To the surface of the yarn ii. To the core of the yarn

iii. At random

22. Longer and finer fibres require a card cylinder having

i. Higher wire point density ii. Lower wire point density

 iii. Higher speed

23. On the scutcher, the ratio of fan speed to beater speed required for synthetic
fibres, as compared to cotton fibres ,is

i. Higher ii. Lower iii. Equal

24. On a good ring frame, the spinning tensions for cotton yarn would be around

i.1.0 g/tex ii.0.1 g/tex iii.0.001 g/tex iv.0.11 g/den

25. Balloon control rings are more effective

i. At the end of the doff ii. At the middle of the doff

iii. At the beginning of the doff iv. Throughout the doff

26. If the difference between the number of thick and thin places is very high, the
machine to be checked first would be

i. Draw frame ii. Speed frame iii. Ring frame iv. Card

27. The waste removed in blow room while processing man-made fibres should be
around

i. 0.1% ii.1% iii.2% iv.3%

28. The amount of spin flash applied by fibre manufacturers to polyester staple is
around

i.0.16% ii.0.48% iii.1.0% iv.5%

29. The traveler weight employed for polyester blend, compared to that employed for
cotton is

i. Less ii. More iii. The same

30.The most preferred bleater for processing man-made fibres is

i. Shirley opener ii. Kirschner beater

iii. Creighton iv. Three bladed beater

IV. Write all the correct answers ( write only the alphabets e.g. A or B,C etc)

31. During sizing, pick up will increase if

i. Sizing speed increases ii. Squeezing pressure increase

iii. Position of immersion roller is lowered
iv. Temperature of drying cylinder decreases

32. Fabric cover on a loom is improved by

 i. Raising the back rest ii. Having early shedding
iii. Having late picking iv. None of the above

33. Activation of bottom change on automatic loom is preferred by weft feeler compared
to weft fork because

i. It increases the loom efficiency ii. It improves the quality of fabric

iii. It reduces the weft waste iv. It reduces the work load of worker

34. In shuttleless weaving, weft waste is minimum on

i. Air-jet loom ii. water-jet loom

iii. Rapier loom iv. Gripper (or projectile) loom

35. On Sulzer projective loom, the number of projectiles depends on

i. Weight of projectile ii. Width of loom

iii. Speed of loom iv. Picking force

36. Circular looms are preferred over conventional looms

i. When weft pattern is complicated ii. When the silk yarn is involved
iii. When hose type of fabrics are required
iv. Because circular looms give higher efficiency

37. In triaxial weaving, weft is inserted

i. In single picks ii. In double picks iii. By two pick cycle iv. None of the above

38. Gauge on the winder with trap type(serrated) slub catcher for 25 tex yarn will be

i. 0.1 – 0.2 m ii. 0.6 – 0.7mm iii.1.0 – 1.3 mm

39. Percent waste in sizing department, calculated on the yarn processed in the sizing , is
normally

i.0.5 – 0.8% ii.1.2 – 1.5% iii.2.0 – 2.5%

V. Write all the correct answers (write only the alphabets e.g. A or B, C etc)

40. If the specific volume and twist factor of a yarn are 1.0 cm3/g and 60 tex1/2 turns/cm
respectively, what will be its twist angle?
i. 30o ii. 34 o iii. 32 o iv. None of the above

41. The value of retraction factor ranges between

 i.0 to ∞ ii.1 to ∞ iii.0 to 1 iv. has no range

42. If the ratio of strength of two fold yarn to its component single yarn is four, what will
be the ratio of their tenacities?

i.4 ii.2 iii.1 iv. None of the above

43. Which of the following relationship(s) is/are correct?

i.ef = ey cos2θ iii.Ey=Ef. cos2∝

ii.ef = ey iv.Ey=Ef.cos2 ∝=Ef

cos2θ
where

Ey =Yarn modulus
Ef =Fibre modulus
∝=Helix angle at yarn surface
ey=Yarn extension
ef=Fibre extension
θ =Helfix angle of fibre

44. The index of Blend Irregularity (I.B.I) values proposed by Coplan and Klein may
have the following interpretation

i. I.B.I = 0, means complete randomness

ii. I.B.I = 1, means perfect blending
iii. I.B.I > 1,means presence of clustering
iv. I.B.I = 0, means perfect blending

SECTION B

IV. Write All the correct answers (write only the alphabets e.g.A,B,D etc.)

45. Drawing

i. increases crystallinity ii. increases birefringence

iii. decreases crystalline iv. increase strength

46. Nylon is drawing

i. at glass transition temperature ii. at softening temperature

iii. at room temperature iv. at 100% r.h. conditions

47. The denier of tow used for producing polyester staple fibres, before drawing, is about

i.3,000 ii.30,000 iii.300,000 iv. None of the above

48. Heat setting in relaxed conditions

i. reduces strength ii. increase orientation iii. increases crystallinity

iv. increases density

49. False-twisting means

i. twisting in the false direction ii. not twisting

iii. introducing equal and opposite twist iv. twisting with friction discs

50.Edge crimped yarns

i. have zig-zag configuration ii.have helical configuration

iii. give stretch yarns iv.give modified stretch yarns

51. In the context of friction spindles for texturing, the twister angle should be

i.30o ii.45 o iii.60 o iv.90o

52. Air-jet texturing

i.reduces the strength considerably

ii.does not decreases the strength
iii. uses overfeeding to get the textured effect
iv.uses air-jets to get the textural effect.

53. Stuffer-box technique

i. is used to produce textural yarns for carpets

ii. can process heavy denier yarns
iii. is used to give crimps in staple fibre production
iv. is suitable for monofilaments

54. A spin finish formulation contains

i. Delustrant ii. Whitener iii. Lubricant iv. Antioxidant

SECTION B

55.Gas-singeing machine is operated at a speed of

i. 50 – 70 m/min ii.125 – 200 m/min iii.10-40 m/imn

iv.80 – 120 m/min

56. The desizing process mainly removes

 i. Wax and tallow ii. Dirt and colour iii .Starch iv. Natural impurities

57. Batch-wise scouring can be carried out in

i. Winch ii. Jigger iii. Kier iv. J-Box

58. The most important ingredient of a scouring composition is

i. Wetting agent ii. Alkali

iii. Emulsifying agent
iv. Sodium silicate

59. Wool and silk can be bleached with

i. Sodium hydrosulphite ii. Sodium perborate

iii. Hydrogen peroxide iv. Sodium hypochlorite

60. Polyester and acrylic fibres can be bleached with

i. Sodium hydrosulphite ii. Hydrogen peroxide

iii. Sodium chlorite iv. Sulphur dioxide

61. Mercerization is carried out with NaOH of

i.10 – 15% Conc. ii.18 – 25% Conc.

iii.5 – 10% Conc. iv.25-35% Conc.

62. An optical brightener is

i. A synthetic bluing agent ii. A colourless dye

iii. A fluorescent compound
iv. An optical whitener

63. Damage caused to cotton during bleaching can be assessed by measuring

i. Cuprammonium Fluidity ii. Methylene Blue Absorption

iii Barium Number iv. White index

64. Efficiency of mercerization can be assessed by

i. Dye sorption ii. Deconvolution count

iii. Shrinkage iv. Sinking time

V. Fill in the blanks:

1.Example of seed fibres is cotton and ____________

2.Cross-section of NaOH swollen cotton fibres shows rings in the secondary wall which
are better known as _____________.

3.The hollow space in cotton fibres is known as Lumen while that in wool is called
__________.

4.The sulphur containing amino acids in wool are cystine and ______________.

5.Stem fibre are also known as___________.

6.Linen is made up of individual cells named ________________.

7.The monomers used in the production of PET are MEG and _____________.

8.Acrylics that contain less than 85% of acrylonitrile by weight are termed.

9.____________ is the catalyst used during polymerization of polypropylene

10.______________ is a naturally occurring mineral fibre.

11. Dilute solution viscosity of a branched polymer is ___________ than that of the
Corresponding linear polymer in the same solvent.

12.Anionic polymerization produces a ____________ molecular weight distribution in

the polymer.

13.A monomer capable of forming a six-membered ring under-goes ___________

reaction.

14.A cross-linked polymer has __________ molecular weight.

15.A red ox initiator is most suitable for _____________ polymerization.

16.Benyzylamine can act as a __________ in polyethylene terephthalate manufacture.

17.Degree of crystallinity can be best determined by ______________ technique.

18.Viscocity average molecular weight is lower than ___________ average molecular

weight.

19.Besides melt spinning nylon 6 fibre may also be produced by __________ spinning
method.

20.Differential thermal analysis can be used for obtaining ____________ of a polymer.

21.___________ colours can be prepared on the substrate.

22.Reactive dyes form a ___________ bond with the fibre.

23.Indigo is a ____________ dye.

24.Pigments are applied along with a ___________.

25.Acrylic fibres are dyed with _________ dyes.

26.Rapidogen colours are a mixture of a ____________ base and a ______________.

27.A low-temperature catalyst for curing pigment colours is ______________.

28.The most preferred chemical used in discharge printing for reducing

the dye is ____________.

29.Steaming of printed polyester fabrics is carried out in a loop ager at_________ oC.

30.Carbonization treatment is given to printed polyester/viscose rayon fabric

to dissolve ______________.

3.Write with reasons, whether the following statements are True or False:

31.Cellulose acetate can be melt spun.

32.Wool dissolves in sulphuric acid.

33.Cotton behaves as a cross-linked polymer

34.A copolymer has a lower melting temperature than that of the respective
homopolyemers.

35.Variation in relative humidity of air has no effect on tensile characteristics of a fibre.

36. The displacement of an absorption band towards longer wavelength is called Red shift.

37.The colours that are on the textile fabrics are due to subtractive colour mixing.

38.Optical density is same as absorbance.

39.The visible region is from 300 nm to 700 nm.

40.The lightfastness is assessed with the help of a grey scale.

41.Toluene on sulphonation gives meta substituted sulphonic acid.

42.H-acid is made form the corresponding naphthalene trisulphonci acid by nitration and
reduction.
43.A diazonium compound couples with phenol at m-position.

44.Hydroxyl and amino groups do not influence the colour and dyeing properties of azo
dyes
 PART – A

1. The ratio of fan to beater speed in the scutcher is higher when processing

a. Cotton b. Man-and fibres c. None of the above

2. Longer and finer fibres would require a card cylinder having

a. Higher wire point density

b. Lower wire point density
c. Greater wire height
d. Lower speed

3. The reduction in nep level at the card comes through

a. Crushing of neps between calendar rollers

b. Removal of neps in the licker-in droppings
c. Removal of neps in Flat strips
d. Disentanglement of neps

4. As a guide line, the optimum level of comber waste should be

a. equal to short fibre %

b. twice the short fibre %
c. 1.3 times the short fibre %
d. 0.5 times the short fibre %

5. In the cotton system, the bobbin rail speed (cm/min), as the roving bobbin builds
up, should

a. increases b. decreases c. remains constant

6.Murata Jet Spinner has been commercially highly successful for yarns form

a. Cotton b. Polyester and its blends

c. Viscose cotton blends d. Wool

7.For excessive difference between the number of thick and thin places the process
most likely to be responsible is

a. Drawing b. Roving c. Ring spinning d. Carding

8.Uster classimat in for classifying

a.Yarn faults b.Yarn imperfections c.Yarn irregularity

9.Tension in yarn during winding from bobbin depends on the unwinding speed is
proportional to

a.V b.V2 c.V3 d.1/V

10. Wind is defined as

a. number of coils per traverse b. number of coils in double traverse

c. number of grooves in the drum

11. Increase in taper angle on the Sectional Warping Machine will require

a. Increase in traverse speed b. Decrease in traverse speed

c. higher warping speed d. lower warping speed

12. During Sizing, the pick up will increase if

a. squeeze pressure is increased b. machine speed is increased

c. temp of drying cylinder is increased

13. Drawing of 4 ends per dent instead of 2 ends per dent in red will result in

a. increased warp breakage rate b. reduced warp breakage rate

c. improved fabric quality d. reduced reed life

14. A design repeating on 10cm along length and 6 cm along width of fabric having
40 ends and 30 picks per cm will require Jacquard Capacity of

a.180 b.240 c.300 d.400

15. Slide Weft Fork on a loom stops it

a. two picks before weft finishes b. one pick before weft finishes
c. just as the weft finishes d. after the weft has finished

16. The speed of tappet shaft on a loom weaving design on 4 ends and 3 picks will be

a. same as that of crankshaft

b. half that of crankshaft
c. one third that of crankshaft

17. If 10 cm of yarn produces 9 cm of fabric, the yarn crimp is

a.11.1% b.10% c. Data is incomplete d. None of the above

18. A 3/3-twill fabric has 120 ends, inch. It is to be charged to 2/l twill, the end
density (per inch) for saine firmness should be

a.60 b.90 c.120 d. 240

19. In the production of Nylon 6,6 fibre forming polymer, salt preparation is
necessary

a. otherwise polymerization will net occur

b. otherwise polymer degrades
c. for p11 considerations d. for maintaining correct stitchiometric ratio

20. The number average molecular weight of fibre grade nylon6,nylon 6,6 and
poly (ethylene terephthalate) polymers is approx
a.10,000 b.20,000 c.30,000 d.40,000

21. Partially oriented yarns (POY) are melt-span at take-up speeds of about
a.500 m.min b.1000 m.min c.3500 m.min d.8000 m/min

22. The setting of Poly (ethylene terephthalate) fabric is usually done at

a.50oC b.100 o C c.150 o C d.200 o C

23. The birefringence of nylon 6 fibres is 0.055 and of PET fibre 0.18.State if

a. both fibres are well oriented

b. PET is well oriented but not Nylon 6
c. Nylon 6 is well oriented but not PET
d. None of the above

24. Singeing of cotton is carried out to

a. remove protruding fibres from fabrics surface

b. impart luster
c. cut long threads from fabric surface

25. Hydrogen peroxide bleaching is carried out of

a. room temperature b.50-60oC c.80-100oC

26. Mercerization of cotton is carried by using

a. Sodium hydroxide b. Sulphuric acid c. Acetic acid

27. Dyeing of polyester is carried out by using

a. Acid dyes b. direct dyes c. Disperse dyes

28. Vinyl sulphone Reactive dyes are applied on cotton under

a. alkaline p11 b. neutral p11 c. acid p11

29. Acid Dyes are held on Nylon by means of

a. electrostatic force b. Covalent bond c. Vander Wall force
30. The most productive method for textile printing is

a. Rotary screen-printing b. Automatic Flat-bed screen-printing

c. Block printing

31. Sublimation Transfer printing is most suitable for

a. Wool b. Jute c. Polyester

32. Fixation of Disperse Dyes on Polyester is carried out of

a. atmospheric steaming b. pressure steaming

o
c. curing at 140 C for 5 minute

33. The more common agents used for discharge printing are

a. oxidizing type b. reducing type c. Neutral in reaction

34. Wash & Wear finishing of cotton is carried out to improve

a. crease resistance b. fabric feel c. abrasion resistance

35. Soil release finish is more effective on

a. Polyester b. Cotton c. Wool

36. Cotton can be made water repellant by using

a. Silicone finish b. anionic softener c. rot proofing agent

2. Fill in the blanks:

1. ______________ is a leaf fibre

2. ______________ is a mineral fibre

3. Acrylic has at least _______________ % acrylonitrile by mass

4. Specific volume of cotton fibre is ____________ cm3 /g.

5. SI unit for tearing strength is _____________.

6. 10s Cotton Count is equivalent to _________ denier.

7. Fineness of merino wool range between _________ µm.

8. Moisture regain of silk at 65% rh is ___________ %.

9. Instron tensile tester work on ___________ principle.

10. Number of 3 denier fibres in a 10s cotton count yarn will be____________.

11. Thickness of woven fabrics is generally measured under________ g/cm3 pressure.

12. Bending stiffness of yarn can be measured using ___________ method.

13. Flow rate through 10 layers of fabric is 5 cm3/sec/Cm2/cm of water head. Air
permeability of the fabric is approx _______________ cm3/sec/Cm2 per cm of
water head.

14. One of the important mechanical property of fabric affecting the fabric

handle is ___________.

15. Thermal insulation of fabrics is often measured in the units of _____________.

16. In a mixing having 4% trash, the % of trash in the blow room dropping would be
around____________ %

17. The 100% production of draw frame producing 2 k tex silver at 500 m/min is
___________ kgm/hr per delivery.

18. The actual draft on a comber having a mechanical draft of 90 and waste %
of 10 is _____________.

19. On a good Ring frame the spinning tension for cotton yarns should be around
____________ g/tex.
20. The ____________ hooks are preferentially removed in roller drafting
52s Reed means that there are ___________dents/inch.

21. Fabric cover is improved by _____________ the backs rest and

___________shedding.

22. Repeat of width of weaven design can be ____________ by using ‘V’ unit.

23. The linking of monomer units without any product splitting off is called
____________ polyemerization

24. The three steps of addition Polymerisation are _____________ propogation

& termination.

25. The functional groups leading to polyester are ______________ COOH

and ________

27.The functional groups leading to Nylon 6,6 are __________ and _________ NH2.

3.Write with reasons, whether the following statements are True or False:

28.Balloon control rings are effective throughout the doff.

29.For spinning coarser yarns, the ring flange number should be higher.

30.With almost Four-fold increase in the Rotor speed, the opening roller speed has not

increased by more than 25%

31.A good textile fibre should be 100% crystalline.

32.Electron Microscope are capable of achieving very high magnification because

they have very powerful lenses.

33.Tenacity of cotton increases with increase of moisture content.

34.Wool is highly extensible because of its helical molecule.

4. Match the pair

I. 1. wave length of X-ray A. 5000oA

2. wave length of Infrared B. 10,000 Ao
3. wave length of light C. 1o A

II.1. Nylon 6 fibre A. Underwear

2. Acrylic fibre B. Sweaters
3. Cotton fibre C. Doormat
4. Jute fibre D. Tyre cord

III 1. Reactive dyes on cotton A. Vander Wal force

2. Acid dyes on wool B. Covalent bond
3. Direct dyes on cotton C. Elecrostatic force

IV 1. Sodium hydrosulphite A. Oxidizing agent

2. Hydrogen peroxide B. Reducing agent
3. Cellulose C. Enzyme

V 1. Cotton yarn A. Acrylic size

2. Polyester yarn B. Starch size
3. Acrylic yarn C. Polyvinyl alcohol
 SECTION A
(100 Marks)

SUBSECTION A1
(75 Marks)

1. Write the most appropriate answer in your Answer Book (Writing just the letter A,B,C
or D against each question number in the answer book is sufficient)

i. Density of wool fibre in g/cm3 is

(A) 1.52
(B) 1.31
(C) 1.39
(D) 1.10

ii. Melting point of polypropylene in 0c is

(A) 110
(B) 150
(C) 170
(D) 200

iii. Aspect ratio (length/diameter) in case of staple fibres is generally of the

order of

(A) 10:1
(B) 100:1
(C) 1000:1
(D) 10000:1

iv. Among the following, strength/Weight ratio is highest for

(A) Steel
(B) Nylon
(C) C Kevlar
(D) Polyester
v. Typical mass of a staple fibre in microgram(s) is of the order of

(A) 0.1
(B) 1
(C) 10
(D) 100

vi. Percentage moisture regain of nylon is

(A) 0.4
(B) 4
(C) 6
(D) 9

vii. Alkali resistance is highest in case of

(A) Cotton
(B) Wool
(C) Silk
(D) Polyester

viii. Metric count (Nm) equivalent of 90 denier yarn is

(A) 9
(B) 10
(C) 90
(D) 100

ix. One Newton force is equivalent to

(A) 98 gf
(B) 100 gf
(C) 102 gf
(D) 1000 gf

x. Air flow resistance of a mass of fibres of diameter d is proportional to

(A) d
(B) d2
(C) 1/d
(D) 1/d2
xi. Number of 2 denier fibres in 10s cotton count yarn will be nearly
(A) 66
(B) 100
(C) 200
(D) 266

xii. Optic axis of a fibre is same as the crystallographic

(A) a-axis of the fibre

(B) b-axis of the fibre
(C) c-axis of the fibre
(D) none of the above

xiii. Polyethylene Terepthiate crystallizes slowly due to the

(A) flexibility of chains

(B) stiffness of chains
(C) hydrogen bonding between chains
(D) higher nucleation density

xiv. Repeat length of Nylon 6 to Nylon 66 is

(A) Half
(B) Twice
(C) One-fourth
(D) One

xv. Compared to melt spun fibres, chains are in the extended form in the gel
spun fibres because of the possibility of

(A) High entanglement density in melt

(B) Low entanglement density in melt
(C) Easier repitation of chains in melt
(D) None of the above

xvi. When cloth gets soaked in water, it looks transparent because of

(A) Reflection
(B) Refraction
(C) Diffraction
(D) None of the above
xvii. Which of the following is the thermodynamically stable state of chains in
a fibre

(A) Folded chains

(B) Extended chains
(C) Fringed-micelle arrangement of chains
(D) Spherulitic formation of crystals

xviii. The % cleaning efficiency of a cotton blow room line lies between

(A) 40 & 50
(B) 50 & 60
(C) 60 & 75
(D) 80 & 95

xix. The production rate of a card processing finer fibres is comparatively

(A) Less
(B) More
(C) Same
(D) Depends on fibre strength only

xx. Compared to the lap, the nap level in the card silver should be

(A) Less
(B) More
(C) Same
(D) Zero

xxi. The weight in grams of one meter of cotton silver normally lies between

(A) 0.5 – 1.0

(B) 1.0 – 2.0
(C) 2.5 – 4.0
(D) 6.5 – 10.0

xxii. The level of card waste is comparatively higher in

(A) Conventional flexible fillet card

(B) Semi-high production card
(C) High production card
(D) Modern super high production card
xxiii. Rotor spinning has been most successful for spinning of

(A) Cotton
(B) Acrylic
(C) Viscose
(D) Polyester.

xxiv. the twist in the roving made from finer fibres should be comparatively

(A) Same
(B) Higher
(C) Lower
(D) Zero

xxv. On classimate, the objectionable faults are

(A) A4, B4, C4, D4

(B) B3, B4, D3, D4
(C) C3, C4, D3, D4
(D) A4, B4, C3, C4, D3, D4

xxvi. Yarn tension during unwinding is proportional

(A) √tex
(B) tex
(C) √Ne
(D) Ne

xxvii. In surface driven winder, the winding speed is constant

(A) Constant
(B) Increases with increase in package diameter
(C) Decreases with increase in package diameter
(D) None of the above

xxviii. A 2.5 crossing drum means there are

(A) 2.5 turns in a double traverse

(B) 5 turns in a double traverse
(C) 5 turns in a single traverse
(D) None of the above
xxix. Cone angles of 40 20 are preferred compared to 90 15 cone angles for surface driven
drum winders because it

(A) Gives more yarn on package

(B) Reduces slippage of package with drum
(C) Is easy to transport
(D) None of the above

xxx.Sectional warping is more suitable than beam warping

(E) For executing big orders

(F) When sizing is considered necessary
(G) when multifilament yarns are used
(H) None of the above

xxxi.Sizing gives yarn

(A).Higher breaking strength

(B). Higher elongation at break
(C). Higher flexibility
(D).None of the above

xxxii.In an automatic loom

(A). weft break is repaired automatically

(B). warp break is repaired automatically
(C). Weft package is replacedautomatically
(D). None of the above

xxxiii.The speed of tappet shaft on a loom running at 180 rpm weaving 1 up 2 down will
be

(A). 90 rpm
(B). 180 rpm
(C). 60 rpm
(D). 120 rpm

xxxiv.40 s Reed for plain weave means there will be

(A). 40 dents per inch

(B). 40 ends per inch
(C). 20 ends per inch
(D). None of the above
xxxv.In Sulzer projectile loom, the picking force depends on

(A) Loom speed

(B) Projectile mass
(C) Torsion bar adjustment
(D) None of the above

xxxvi.Enzyme treatment of cotton is carried out to remove

(A). Size
(B). Colouring matter
(C). nitrogenous substances
(D). Waxes

xxxvii.Sodium hypoclorite bleaching of cotton is carried out at

(A). room temperature

(B). 50 – 600C
(C). 900 C
(D). At boil

xxxviii.Commercially, scouring of cotton is carried out by using

(A). Sodium hydroxide

(B).Sodium chloride
(C). Potassium hydroxide
(D).Calcium hydroxide

xxxix.Dyeing of silk is carried out by using

(A). Disperse dyes

(B).Acid dyes
(C). pigment colours
(D). None of the above.

xxxx.Monchloro triazine reactive dyes are applied on cotton under

(A). Neutral pH
(B). Acid pH
(C) alkaline pH
(D). None of the above
xxxxiModified cationic dyes on acrylic are held by

(A). Covalent bonds

(B). Vander waal force
(C). Ionic interaction
(D). None of the above

xxxxii.Cylindrical design screens are used in the technique of

(A). Automatic flat-bed screen printing

(B). rotary screen printing
(C).Manual screen printing
(D). Spray printing

xxxxiii. Discharge printing of polyester is carried out by using

(A). Common salt

(B). Reducing agent
(C). acid liberating agent
(D). None of the above

xxxxiv. Sublimation transfer printing of polyester with disperse dyes is carried out at

(A). 190 – 210 0C

(B). 140 – 150 0C
(C). 50 – 60 0C
(D). Room Temperature

xxxxv. Swelling agent used during printing of nylon is

(A). Sodium Carbonate

(B). Acetic acid
(C). Phenol
(D). Sodium Sulphate

xxxxvi. Stone wash finish is more commonly given to

(A). Popiln
(B). Suiting
(C). Denim
(D). Cambric
xxxxvii. Weight reduction finish is more commonly given to

(A). Nylon
(B). Silk
(C). Polyester
(D). Cotton

xxxxviii. Heat-setting of polyester is carried out on

(A). mercerizing machine

(B). Pin stenter
(C).Open width washing machine
(D). None of the above

xxxxix. Rot Proof finish is given to

(A). Cotton
(B). Polyester
(C). Nylon
(D). Acrylic

xxxxx. Dimethylol dihydroxy ethylene urea is used to improve

(A). Crease resistance of cotton

(B). Flame resistance of nylon
(C). Softness of polyester
(D). Soil release.
2.Fill in the blanks (in your answer book, against each sub question number write only
what is required , to fill the blank)

1. 3 micrograms per inch cotton fibre fineness is equivalent to _________________

denier.

2.Even when tenacity and breaking elongation of nylon and polyester fibres are equal,
Polyester will bave ______________ modulus than nylon

3.Moisture regain of wool is nearly __________ times that of cotton.

4.In flax, ramie and hemp fibres, the spiral angle of chains is less than 6o, so that these
fibres are highly oriented which gives them high strength and low___________.

5.Successive reaction between pairs of monomers is known as step polyemerisation

where as the presence of up paired electrons lead to_____________ polymerization.

6.Polymerisation is mainly performed in oxygen free nitrogen rich environment to avoid

________________ degradation of product.

7.In Polyemerisation of ____________ water acts as the catalyst for the reaction, whereas
in production of nylon 66 it needs to be removed to get high molecular weight.

8. The weight of 1 meter of 20 tex yarn is __________ kg.

9. The 100% production on a ring frame producing 20s Ne yarn at 20 m/min is

___________g/spindle hour.

10. The feed to the comber should have majority of the hooks in
_____________ direction.

11. The maximum rotor speed of a modern rotor frame is __________ rpm.

12. On a draw frame 6 slivers of 3 ktex each are fed. If the draft given is 8.0 , the output
sliver would be ____________ ktex.

13. A loom of 270 cm width running at 300 rpm will give weft insertion rate of
__________ m/min.

14. The fractional cover of warp from 16 Ne cotton yarn and 28 ends per inch is
___________

15. The wet pick up in sizing is ____________ for an add-on of 18% and wet liquor
concentration of 12%.
3.Write with reasons, whether the following statements are True or False:

1.Melt-spun polyester is extensible because of the amorphous state of fibres

2. Glass transition involves increase in the heat capacity

3.The speed of modern travelers should not exceed 80 km/hour.

4.The ply yarn is always more than even than the single yarn

5. The card web does not show preferential orientation along any direction
 1996

L1 In each of the sub questions below four alternatives are provided of which one is correct.
Choose the correct alternative and write in your answerbook the letter A,B,C, or d against the
corresponding sub question number [25x1=25]

1.1 A fibre was heated with soda lime in a test tube. When vapours thus produced were
contacted with glass rod dipped in dipped in dilute HCL, white fumes were produced,
which amongst the following is absent?

a. Silk b. Acrylic c. Polypropylene d. Nylon

1.2 Which of the following is likely to have highest polydispersity, Mw

Mn

a. PET b. Nylon 66 c. Acrylic d. Polypropylene

1.3 The end groups in PET are

a. Carboxyl b. Hydroxyl
c. Carboxyl and hydroxyl d. Carboxyl and Amino

1.4 The fibre that does not shrink when taken near the flame is

a. Polypropylene b. Acrylic c. Acetate d. Viscose

1.5 Which fibre dissolves at room temperature in methylene chloride?

a. Viscose b. Acetate c. Triacetate d. Calcium Alginate

1.6 Which of the following is extremely sensitive to photodegradation?

a. Polyester b. Nylon c. Polypropylene d. Cotton

1.7 Neps on User evenness tester is based on change in mass over a length os

a.1 mm b.2 mm c.4 mm d.8 mm

1.8 If N is the number of fibres in a yarn cross section, the limiting irregularity is proportional
to

a. 1 b. 1 c.1 d. N

N N2 √N
1.9 If D is the fibre diameter, air flow rate through a plug of fibres is proportional to

a.D b.D2 c. 1 d. 1

D D2

1.10 Fabric thickness measured under pressure P is proportional to

a. P b. P2 c. 1 d. log(P)

P
1.11 The average tuft weight produced with UNIfloc is around

a.30 - 50µ g b. 30 -50 mg c.2-4 g d.10-20 g

1.12 In a card, the point-to-point action results in carding action on the fibres. However, the
back-to-back action results in

a. Stripping action b. Opening action

c. Cleaning action d. Brushing action

1.13 Stationary flats are used at the back and front to

a.Remove short fibres b. Reduce thin places in yarn

c. Increase production d. Reduce neps

1.14 The level of spin finish (%) applied on grey 1.5 den x 38 mm polyester fibres is

a.0.15 b.0.30 c.0.45 d.0.60

1.15 The spinning tension in g/tex in ring spinning is

a.1.0 b.2.5 c.3.0 d.4.6

1.16 The maximum twist in rotor spinning is

a. At the package b. In the radial portion of yarn inside the rotor

c. In the p.t.e zone d. Just at the exit from the doffing tube

1.17 Air-jet yarn is weaker than

a. Ring yarn b. Rotor yarn

c. Friction yarn d. None of the above
1.18 If V is the unwinding speed, tension in the yarn is proportional to

a. V b.V2 c. 1 d. 1

V V2

1.19 Size is primarily applied on warp to

a. Increase the yarn strength b. Provide protective coating against abrasion

c. Increase yarn modulus d. Improve stretch properties of yarn

1.20 If P is the loom speed, energy required for picking is proportional to

a. P b. P2 c. P3 d. P4

1.21 Type of selvedge formed on Sulzer projectile loom is

a. Conventional b. Fringe c. Tucked-in d. Sealed

1.22 Production rate will be maximum in case of the manufacture of

a. Woven fabric
b. Warp knitted fabric
c. Needle punched fabric
d. Thermo bonded fabric

1.23 Which fibre is generally dyed with cationic dye?

a. Nylon 6 b. Polyester c. Cotton d. Acrylic

1.24 Resist salt is

a. An exhausting agent b. A reducing agent

c. A mild oxidizing agent d. A leveling agent

THPC is a

a. Water repellent b. Carrier

c. Anionic wetting agent d. Flame retardant
I. Write the most appropriate answer in your Answer book. Write just the letter A,B,C,D
against each sub-question number)

1.1Viscose Rayon filaments are produced through the process of manufacturing known as

a. Solution spinning b. Melt spinning

c. Gel spinning d. Dry-jet spinning

1.1 Ratio of moisture regain for standard viscose rayon to cotton under standard
conditions is nearly

a.4.0 b.3.0 c.2.0 d.0.5

1.2 Special luster of silk is related to

a. fine denier of silk b.triangular cross section of filaments

c. high uniformity of filament denier d.none of the above

1.3 Crystallinity percent of wool fibre is approximately

a.15 b.30 c.45 d.60

1.4 Drawing (or stretching) of synthetic filament is done to

a. increase strength and dimensional stability

b. increase crystallinity
c. reduce extension to bread
d. remove build – in stresses

1.5 Alkali resistance is highest in case of

a. Cotton b. Polypropylene c. Silk d. Jute

1.6 Tenacity of wool fibre changes with increasing moisture regain in the following
manner:

a. increases b. decreases c. remains constant d. increases rapidly

1.7 If mass variation in a yarn is distributed normally, which of the following relations
hold good

a.CV%>1.25 u% b.CV%=1.25 u%
a.CV%<1.25 u%
a.CV%= u%

1.8 Bursting strength is normally carried out for

a. Woven fabrics b. Non-woven fabrics

c. Knitted fabrics d. Braided fabrics
1.9 The ratio of fabric strength per thread and single thread strength is always

a. Greater than unity b. Less than unity

c. Equal to unity d. None of the above

1.10 In a spinning mill, fibre bundle strength is preferred over single fibre strength,
Because

a. Bundle strength test is easy and quick

b. It gives less variation
c. It has better correlation with yarn strength
d. It gives benefit of all above three

1.11 Uniformity Ratio gives an idea about

a. Short fibre percent in cotton b. Effective length of cotton

c. Length variability of cotton d.Longest fibre present in cotton

1.12 Twist multiplier(TM) is a better indicator of twist characteristic of yarn

than T.P.I Because

a. TM is directly proportional to the tangent of twist angle

b. TM describe level of twist in yarn irrespective of linear density
c. TM is related to both the above characters

1.13 Imperfections are sum total of

a. Thick places and thin place b. All Classimat faults

c. Thick places and neps d. Thick places, thin places and neps

1.14 To process acrylic staple one should use

a. SRRL opener b. Krischner beater

c. Air-jet cleaner d. Step cleaner

1.15 In a scutcher the calendar-roller pressure for viscose as compared to

cotton fibres is

a. Higher b. Lower c. Same d. Nil

1.16 Surface speed of cylinder in a card is lower than that of

a. Doffer b. Licker-in c. Flats d. None of the above

1.17 The hooks which are preferentially removed in roller drafting are

a. Trailing b. Leading c. ’U’ shaped d. Double

1.18 The roving twist used for longer fibres is

a. Higher b. Lower c. Same

1.19 The ring traveler life is maximum for

a. Viscose rayon fibres b. Cotton fibres

c. Polyester fibres d. Acrylic staple fibres

1.20 The member of fibres of 1.5 denier in the cross-section of a Ktex sliver is

a.18,000 b.20,000 c.2,000 d.200

1.21 Surface driven cross wound packages have over the entire build

a. Constant rpm b. Constant wind per traverse c. Constant angle of wind

1.22 Magazine creel is used in warping for

a. Warp sheet with complex pattern

b. Warp sheet meant for short run
c. Warp sheet meant for long run and mass production

1.23 Polyvinyl alcohol (PVA) is used for sizing

a. Cotton yarn b. Polyester/Cotton blended yarn

c.Spun viscose rayon yarn

1.24 Temples on a loom

a. Reduce strain on selvedge threads b. Assist fabric take-up

c. Control shuttle flight path

1.25 Gauge of a knitting machine is

a. Number of needles/inch on the machine

b. Distance between two neighboring needles on the machine
c. Total number of needles on the machine

1.26 A Cross-lapped web has majority of the fibres oriented along

a. The length of the web b.The width of the web

c. A direction intermediate between the length and width of web

1.27 A Square jammed plain woven fabric has cover factor of

a.10.23 b.16.16 c.24.26

1.28 Boiling-off of cellulosic fibrous material during scouring in air may result in the
formation of

a.Oxycellulose b.Soda-cellulose c.Hydrocellolose

1.29 For bleaching of cotton, amount of H2O2(50% required is

a.15 - 30gpl b.1 -5 gpl c.35 -50gpl

1.30 Sodium chlorite is used for the bleaching of

a.Nylon b.Wool c.Polyester

1.31 Material to liquor ratio in a Jigger dyeing machine is

a.10 – 15 b.20 - 40 c.3 – 4

1.32 Indigo is a

a.Direct dye b.Basic dye c.Vat dye d.Solubilized vat dye

1.33 For pigment printing following type of thickener system is preferably used

a.Oil-in-water b.Water-in-oil c.Sodium alginate d.Guar gum

1.34 For wash-n-wear finish the crease recovery angle should be

a.90o-180 o b.180 o – 220 o c.260 o -300 o

2.Match the pairs. Write your answer in boxes provided in the answer book.For instance,
the answer for Q.2.0 is 1B,2A,3C

2.0 1. Spinning A. Loom

2. Weaving B. Ring Frame
3. Dyeing C. Jigger

2.1 1. Polyester A. Excellent elastic recovery

2. Nylon B. Excellent acid/alkali resistance
3. Polypropylene C. Excellent crease resistance

2.2 1. Cotton A. Percent extension to break ‘8’

2. Wool B. Percent extension to break ‘5’
3. Jute C. Percent extension to break ‘40’

2.3 1. Nylon A. Bulk in the fibre is due to Crimp

2. Wool B. Bulk in the yarn is due to Differential
Shrinkage
3. Acrylic C. Bulk in the yarn is due to False Twist
 Texturing Process

2.4 1. Polyester A. Transesterification

2. Polypropylene B. Salt dehydration
3. Nylon C. Ziegler –Natta Catalyst

2.5 1. Classimat faults A. Uniformity Ratio

2. Fibrograph B. Periodic Variation
3. Spectorgram C. Objectionable faults

2.6 1. Flexural rigidity A. Air permeability

2. Bending length B. Fabric hand
3. Cover factor C. Drapability

2.7 1. Count CV A. Gravimetric

2. Imperfections B. Optical
3. Hairness C. Capacitive

2.8 1. Tenacity A. Percentage

2. Breaking extension B. Micronaire
3. Fibre fineness C. CN/tex

2.9 1. Speed frame A. Flats

2. Ring frame B. Cone drums
3. Card C. Ring traveler

2.10 1. Filament A. Denier

2. Roving B. Count
3. Yarn C. Hank

2.11 1. Bobbin A.14700 rpm

2. Ring traveller B.300 rpm
3. Front drafting rollers C.15000

2.12 1. Ring Spinning A. Spinning drums

2. Rotor Spinning B. Twin disc
3. Friction Spinning C. Bolster/Inser

2.13 1. A cones is A. parallel wound

2. A pirn is B. cross wound
3. A weaver’s beam is C. near-parallel wound

2.14 1. 2/2 twill tappet A. Semi-open shed

2. Double-lift Jacquard B. Centre closed shed
3. Plain weave tapper C. Open shed

2.15 1. Yarn speed in cone winding A. 800 m/min

2. Yarn speed in sizing B. 1200 m/min
3. Unwinding speed of Weft
 from shuttleyeing C. 100 m/min

2.16 1. Non- woven fabric A. Curtains and laces

2. Weft knitted fabric B. Filtering material
3. Warp knitted fabric C. Leisure wear

2.17 1. Cotton A. Lignin

2. Jute B. Suint
3. Wool C. Pectin

2.18 1. PAN fibres A. Reactive dyes

2. Nylon B. Basic dyes
3. Viscose rayon C. Netal-complex dyes

2.19 1.Roller printing A. Roller squeegee

2.Rotary screen printing B. Pentograph
3.Block printing C. Mallet

2.20 1.Woollen suiting A. Shrink-drying

2. Silk B. Decadizing
3. Cotton knits C. Scroop
 1999

I. Write the most appropriate answer in your Answer book.(Write just the letter
A, B, C, or D against each sub-question number in the specified box)
[25*1=25]

1.1 Poly (acrylonitrile) filaments are manufactured by

a. Melt spinning b. Solution spinning

c. Dry-jet-wet spinning d. Gel spinning

1.2 Good elastic recovery of wool fibres is associated with

a. Scaly surface structure b. α-β crystal transition

c. Crimp in fibres d. Low crystallinity

1.3 Heat setting of synthetic filaments is done to

a. Increase strength b. Increase crystallinity

c. Remove built-in stresses d. Reduce extension-to- break

1.4 Acid-alkali resistance is the highest for

a. Cotton b. Nylon c. Silk d. Polypropylene

1.5 Most dominant synthetic fibre used in the world is

a. Nylon b. Kevlar c. Polypropylene d. Polyester

1.6 The method to take samples from a drawn sliver uses

a. Zoning technique b. Squaring technique

c. Core sampling d. None of the above

1.7 In Classimat system, yarn faults are classified into

a. Classes of various cross-sectional sizes only

b. Classes of various length only
c. Classes of various cross-sectional sizes and lengths
d. Classes of various mass groups

1.8 On a CRE machine, if gauge length increases the rate of loading will

a. Increase
b. Decrease
c. Initially increases and then decrease
d. Remain unchanged
1.9 The 2.5% span length is numerically nearer to

a. Staple length b. Mean length

c. Longest fibre length d. Short fibre%

1.10 Yarn strength for longer gauge length

a. Is lower b. Is higher c. Depends on tensile tester d. Remains the same

1.11 The blow room line for processing viscose rayon fibres,as compared to
Processing cotton, has

a. More number of beating points

b. Less number of beating points
c. Same number of beating points
d. Beaters running at higher speeds

1.12 The cards reduces the short fibre % by

a. 1-2 b.4-5 c.6-10 d. Zero

1.13 On a ring frame the spindle speed is 16,000 rpm. If the yarn twist is 8 tuns/cm and
Winding-on circumference is 5 cm, the traveler rpm would be

a.14,998 b.15,000 c.16,600 d.15,600

1.14 The yarn strength expressed as RKM is equivalent ot

a. Grams per denier b. Grams per tex

c. C S P d. Breaking load in grams

1.15 The norm for production in grams per spindle shift for 40s combed yarn is

a.100 b.140 c.180 d.50

1.16 The number of heald reversing rollers for weaving a 5-end Satin is

a.6 b.5 c.4 d.2

1.17 Length of yarn in a bunch on a pirn of automatic loom approximately equals

a. Half the reed width b. The reed width

c. Twice the reed width d. Four times the reed width

1.1 The rate of production of a modern warping machine is

a.400 m/min b.1000 m/min c.2000 m/min d.5000 m/min

1.2 The temperature range of during cylinders of a multi-cylinder machine, sizing
Cotton,yarn,is

a.75o -80 o b.140 -150 o c.180 o -200 o d.200 o -250 o

1.3 Increase in warp tension, keeping the other variables same, would cause

a. Increase in crimp of both warp and weft

b. Increase in warp crimp but decrease in weft crimp
c. Decrease in warp crimp but increase in weft crimp
d. Decrease in crimp of both warp and weft

1.4 The principal objective of cotton scouring is to

a. Increases whiteness b. Decrease trash content

c. Increase absorbency d. Remove deeply embedded proteinous matter

1.5 In the case of hypochlorite bleaching, the species responsible for bleaching is

a. O2 b.[0];nascent oxygen c.cl2 d.(0 cl)

1.6 Reaction of vinyl sulphone dyes with cellulose is

a. Nucleophilic substitution
b. Electrophilic substitution
c. Nucleophilic addition
d. Electrophilic substitution

1.7 ‘Batik’ printing is carried out using

a. Direct style b. Discharge style

c. Resist style d. Transfer printing

1.8 Mixture of titanium chloride and antimony oxide is used for producing flame
Retardant cotton. Flame retardancy is primarily obtained by

a. Titanium chloride
b. Antimony oxide
c. None of them; but their reaction product
d. Both; the mixture is synergistic
2.Match the pairs. Write your answers in appropriate boxes provided in the answer
book. For instance, the answer for example given below is
1B, 2A,3C
[25X2=50]

2.1 1. Nylon 66 A.Carprolactum

2. Nylon 6 B. Hexamethylene diamine
and adipic acid
3. Polyester C. Terephthalic acid
and diethylene glycol

2.2 1. Moisture ragain of cotton A.16%

2. Moisture regain of wool B.13%
3. Moisture regain of viscose C.8%
rayon

2.3 1. Crystallinity A. Optical microscopy

2. Birefringence B. X-ray diffraction
3. Melting C. Thermal methods

2.4 1. Abrasion resistance A. Nylon 6

2. Lustre B. Wool
3. Thermal insulation C. Silk

2.5 1. Drawing A. Bulk

2. False twist texturing B. Friction
3. Spin finish C. Dimensional stability

2.6 1. Effective length A.Vibroscope

2. Denier B. Pendulum lever
3. C S P C .Baer sorter

2.7 1. Cotton A. Microns

2. Wool B. Denier
3. Polyester C. Micronaire

2.8 1. Shirting cloth A. Bursting strength

2. Parachute cloth B. Tensile strength
3. Car safety belt C. Tearing strength

2.9 1. C R T A. Instron tensile tester

2. C R E B. Stelometer
3. C R L C. Pendulum lever tensile tester

2.10 1. Handle A. Drapability

2. Comfort B. Bending rigidity
3. Aesthetics C. Air permeability
2.11 1. Polyester A. High calendar roll pressure
2. Viscose B. Low calendar roll pressure
3. Cotton C. Medium calendar roll pressure

2.12 1. Cyclinder A. 700 m/min

2. Taker - in B. 1500 m/min
3.Doffer C. 100 m/min

2.13 1. Short staple fibres A. Rotor spinning

2. Long staple fibres B. Ring spinning
3. Short & long staple fibres C. Air-jet spinning

2.14 1. Opening roller A. Drawframe

2. Autoleveller B. Rotor frame
3. Noil C. Comber

2.15 1. Ring frame A.900 m/min

2. Rotor frame B.25 m/min
3. Draw frame C.200 m/min

2.16 1. Beam ruffle A. Buffer

2. Picking stick B. Selvedge
3. Temple rollers C. Negative let-off

2.17 1. Harness cord A. Stockport system

2. Pegs & lattices B. Jacquard
3. Reed C. Dobby

2.18 1. Grooved drum A. Precision system

2. Gain of wind B. Patterning
3. Chase length C. Pirn winding

2.19 1. Poplin A. Floor covering

2. Carpet B. Loop length
3. Pullover C. Warp jammed

2.20 1. Dial & cylinder A. Depth of penetration

2. Guide bar B. Double jersey
3. Barbed needle C. Shogging motion

2.21 1. Silicone A. Optical microscopy

2. Sodium metanitrobonzene
sulphonate B. Reducing agent
3. Sodium sulphoxylate C. Defoamer
formaldehyde
2.22 1.British gum A.Cellulose derivative
2.Gum Indalca B.Starch derivative
3.C M C C.Gum derivative

2.23 1. Copper number A. Measure of molecular weight

2. Methylene Blue number B. Measure of reducing groups
3. Cuprammonium fluidity C. Measure of acidic groups

2.24 1. Alizarin A. Vat Dye

2. Malachite Green B. Mordant dye
3. Indigo C. Cationic dye

2.25 1. P C P A. Water repellent

2. T H P C B. Flame retardant
3. Velan PF C. Antifungal agent
 2000

SECTION B
(75 Marks)

Answer ANY FIFTEEN questions from this section.All questions in this section carry 5
MARKS each.Start answer to each question on a fresh page and the answers to all the
sub-parts should be written together.

TF 3 a.A union fabric (20/80) is made from conditioned nylon and cotton.Assuming the
moisture regain for nylon filament as 4% and that aof cotton yarn as
8%,calculate the moisture content of this fabric. [2]

b.An unknown fibre was heated in hard glass test tube in the presence of soda
time.The vapours thus obtained gave white fumes when contacted with a glass
rod dipped in dilute.HCl, In another experiment,the sodium extract of the same
fibre gave back precipitate with acidified lead acetate solution.Identify the
fibre.Give reasons in support of your answer. [3]

TF 4 a.Both the starch and cellulose are made up of glucopyranosyl units.While

cellulosic fibres are well known,fibres from starch cannot be made justify [2]

b.The cellulose molecules in the primary wall of cotton happen to be arranged in

criss-cross network like structure.What purpose does this serve? [2]

c.Why is jute called a multicellular fibre? [1]

TF 5 a.Using chemical equations,give the mechanism of nylon 6 polymerization [3]

b.What is the role of AH salt in the production of nylon 66? [1]

c.Acrylic fibres are generally copolymers.Why? [1]

TF 6 a.In the context of man-made fibres,what is the function of drawing?Why is

polyester not drawn at room temperature? [2]

b.Why do synthetic fibres shrink on free annealing?Give two important

morphological chages that take place as a result of this [3]

TF 7 Four grams of polyester fibre of 1.5 denier with fibre density of 1.39 g/cm3
is packed in a chamber to make a 2 cm long plug of 3 cm diameter Calculate
 a.porosity of the fibre plug

b.percentage change in the air flow rate if 1.5 denier fibres are replaced with the
same mass of 1.2 denier fibres in the plug of the same size [3]

TF 8 A 76 denier 34 filament polyester yarn tested on a CRE tester shows a breaking

load of 350 cN when the gauge length was 100 mm and the cross-head speed was
50 mm/min.What is the expected percentage change in the observed tenacity of
the yarn if the traverse rate is increased to 500 mm/min assuming no change in the
breaking extension of the yarn? [5]

TF 9 A fabric manufacturer regularly tests consignment of yarn to check the average

liner density.Experience has shown that samples chosen at random from a
delivery of this type of yarn gives 3% coefficient of variation in the tex value.A
nominal 20 tex yarn is to be tested such that confidence limits are equal to
20 ± 0.5 tex.How many samples should be tested? [5]

TF 10 Why grab strength of fabrics is more than strip strength? Discuss the effect of
fabric extension in the test direction and the gauge length on the measured values
of strength in case of grab and strip test methods. [5]

TF 11 a. The spinning limit of any given fibre is more in ring than rotor spinning. Why
is it so? [2]

b.A 40 mm rotor running at 60,000 rpm is producing a yarn at

100 m/min,calculate the number of doublings of fibre layers in the rotor [3]

TF 12 a.The grey shade obtained by mixing black and white fibres appears more
uniform in drawn sliver than in the yarn.Why is it so? [2]

b.A 30 tex blended yarn consists of P and Q type of fibres in the weight ratio of
50:50. If fibre P is 1.5 denier,30 mm long and Q is 2.0 denier, 38 mm
long,what will be the number ratio of P and Q in the yarn? [3]

TF 13 a.Why aprons are not used in draw frame drafting system/ [2]

b.Why combing roller is preferred to roller drafting system in rotor spinning? [3]

TF 14 a.Why the draft between cylinder and licker-in is higher for longer fibres than for
shorter fibres?
b.What happens to the noil loss as feed length is increased in forward and
backward feed combing machine?

TF 15 a.Explain the cause of instability of a flangeless cross wound package

 b.Calculate the angle of wind on a 10 cm diameter cheese being wound on a
precision winder with a traverse of 10 cm and traverse ratio of 2.2

TF 16 A 20 kg cotton warp conditioned in standard atmosphere is sized with a paste of

15% concentration.If a 10% add-on on the bone dry yarn is aimed at, then what
should be the wet pick-up/ How much wate is to be evaporated so as to leave 8%
moisture in the warp and10% moisture in the size film?

TF 17 a.Why is a selvedge produced on a conventional shuttle loom constructed

differently from rest of the warp sheet?
b.In the light of the crimp balance equation of Peirce,discuss as to how the crimp
in selvedge yarns is kept tge same as that of the rest of the warp although both
the yarn spacing and yarn thickness in selvedge are different from rest of the
warp.

TF 18 a.Arrange the three weft knitted constructions, namely,

plain singlejersey l x l rib and interlock, in ascending order in terms of width of
resultant fabric if the yarn count and total number of needles remain the same.

b.What type of dimensional change would occur when a tuck stitch is introduced
in a knitted construction?

c.What is the role of a cross lapper in a needle punching non woven production
line?

TF 19 a.Why enzyme desizing of cotton is safer compared to desizing with mineral

acids?
b.why quenching of cotto fabric is essential after singeing?

c.What is the role of sodium silicate in bleaching of cotton with hydrogen

peroxide?

TF 20 a.Sublimation transfer printing with disperse dyes is suitable for printing of

polyester and not for acrylic.Explain briefly

b.Justify why ionic dyes cannot be used for sublimation transfer printing

TF 21 a.In the case of vat dyes,sodium hydrosulphite is not suitable for printing while
sodium sulphoxylate formaldehyde is not suitable for dyeing. Explain

b.Why soaping at boil is absolutely essential after dyeing of cotton with

reactive dyes?
TF 22 a.Differentiate between wash-n-wear and durable press finishing of cotton
garments in terms of process sequence and range of crease recovery angle
achieved

b.Distinguish between vapour phase and condensed phase mechanism

of flame retardancy.
 SECTION A
(75 Marks)

TF 1 This question consists of TWENTY-FIVE sub-questions of ONE mark each. For

each of these sub-questions, four possible answers(A,B,C,D) are given, out of
which only one is correct. Answer each sub-question by darkening the appropriate
bubble on the OBJECTIVE RESPONSE SHEET (ORS) using an HB pencil.

1.1 Which of the following is leaf fibre

a. Ramic b. Banana c. Flax d. Sisal

1.2 Which of the following techniques would provide accurate measurement of

Crystallinity in a semi-crystalline fibre

a. Density measurement b. Differential Scanning Calorimetry (DSC)

c. Wide angle X-ray diffraction d. Infrared spectroscopy

1.3 The amount of recommended water (by weight) in dried poly(ethylene

terephthalate) chips suitable for melt spinning is in the range of

a .Approximately 1% b. 0.1% to 0.4%

c. 0.04% to 0.06% d. 0.001% to 0.005%

1.4 Which of the following fibres can be produced using melt spinning technology

a. Viscose b. Poly(acrylonitrile)
c. Lyocell d. Cuprammonium Rayon

1.5 In Bombyx mori silk,80 – 85% of fibroin is composed of the following amino acids

a. Glycine, Tyrosine and Aspartic acid b. Serine, Tyrosine and Aspartic acid
c. Glycine, Alanine, and Serine d. Tyrosine, Aspartic acid and Serine

1.6 ISO recommended international test conditions are

a. 200C 65%r b. 210C 65% c. 250C 65% d. 270C 65%

1.7 Uniformly Index of a square cut staple polyester fibre will be

a. 0.25 b .0.50 c. 0.75 d. 1.00

1.8 Level of setting for nep on evenness testers is based on reference length of

a. 1mm b. 2 mm c. 4 mm d.8 mm

1.9 Maximum extension rate in m/min on a commercial equipment for tensile testing of
yarns is

a. 5 b. 50 c.200 d.400
1.10 Pressure applied on a woven fabric during measurement of thickness in gf/cm2 is
generally

a.5 b.20 c.50 d.100

1.11 Presence of immature fibre

a. Leads to less roller lapping

b. Leads to more roller lapping
c. Does not influence roller lapping
d. May lead to more or less roller lapping depending on atmospheric conditions

1.12 In Rieter pressure bar drafting system of draw frame, the front bottom roller is
kept at/in

a. Same plane compared to middle and back roller

b. Lower plane compared to middle and back roller
c. Higher plane compared to middle and back roller
d. Curved plane compared to middle and back roller

1.13 Taper of roving bobbin ensures that

a. The layers do not slip

b. More material is accommodated in the package
c. Unwinding tension is uniform
d. Spacing between the coils is uniform

1.14 In ISO standard the traveler number is defined as the mass in grams of

a. 10 travellers b.100 travellers

c.100 travellers d.1000 travellers

1.15 In Murata Air Jet Spinning system

a. Both the nozzles rotate in clockwise direction

b. Both the nozzles rotate in anti-clock wise direction
c. First nozzle rotates in clock wise and second nozzle rotates in anti-clockwise
direction
d. Both the nozzles do not rotate

1.16 The density of a cone of cotton yarn in g/cm3 is

a. 0.15 b. 0.45 c. 0.80 d. 1.10

1.17 The angle of wind of a cone meant for dyeing is

a.15o b.30o c.50o d.70o

1.18 A good spliced joint of a ring spun cotton yarn is

a. As strong as the parent yarn

b. Stronger than the parent yarn
c. 80 to 90% as strong as the parent yarn
d. Half as strong as the parent yarn

1.19 For a high speed automatic loom, the loom width-loom speed combination can be

a. 100cm and rpm b.1.5 m and 110 picks per minute

c. 72 inches and 125 rpm d.60 inches and 250 rpm

1.20 Loop length of knitted fabric is changed by adjusting

a. pthrow cam b. Clearing cam c. Guard cam d. Stitch cam

1.21 Singeing of polyester is carried out to

a. Increase strength b. Reduce pilling

c. Improve dye uptake d. Improve dimensional stability

1.22 Identify the machine that works on the principle of both fabric and liquor moving
during the dyeing operation

a. Jigger b. Jet dyeing machine

c. Beam dyeing machine d. padding mangle

1.23 The most suitable thickener for reactive bye printing on cotton is

a. Starch b. Car boxy methyl cellulose

c. Sodium alginate d. Gum Arabic

1.24 Extremely good wash fastness of reactive dyes on cotton is due to the formation of

a. Covalent bond b. Ionic bond

c. Hydrogen bond d. Vander Waal forces

1.25 Soil release finishes are most effective on

a. Cotton b. Jute c. Viscose d. Polyester

TF 2 This question consists of TWENTY FIVE sub-questions of TWO mark each.For
each of these sub-questions,four possible answers(A,B,C,D) are given,out of
which only one is correct.Answer each sub-question by darkening the appropriate
bubble on the OBJECTIVE RESPONSE SHEET(ORS) using an HB pencil

2.1 Extensibility in natural cellulosic fibres such as cotton,jute,coir etc.depends

Primarily upon

a. Presence and extent of convolutions b. Spiral angle of the fibrils

c. Amount of noncellulosic material d. Arrangement of ultimate

2.2 An ionic comonomer to the extent of 5-10% is normally added in preparation of

acrylic fibres in order to

a. Regulate the coagulation process during solution spinning

b. Improve thermal stability
c. Improve thermal insulation
d. Improve dye ability and moisture regain

2.3 In a DSC experiment a typical heating plot for a semi-crystalline polymer would
show in order with increasing temperature

a. Cold crystallization, Glass transition, Melting

b. Glass transition, Melting, Melt crystallization
c. Glass transition, Cold crystallization, Melting
d. No specific order is observed

2.4 Which of the following statements is not correct with respect to differences between
silk and wool

a. Silk a highly sensitive to alkali while wool is not

b. Silk a smooth while wool has scales on the surface
c. Silk is mostly composed of a few amino acids while wool has many more
d. Silk has higher crystallinity than wool

2.5 What would happen to the mechanical properties of a man-made if its fine structure
is improved, for example making it fibrillar compared to micellar

a. Tenacity increase while extensibility decreases

b. Tenacity decreases while extensibility increases
c. Both tenacity and extensibility decrease
d. Both tenacity and extensibility increase
2.6 The average lea strength of a yarn is 50kgf with a standard deviation of 5 kgf.How
many tests must be made so that mean is estimated with % error or less than 1.96
with 95% level of confidence?

a.10 b. 50 c.100 d.200

2.7 In a twist-untwist method to determine yarn twist using 10 inch sample, 400
rotations of a jaw are required to complete the test. Twist per inch in the yarn is

a.10 b. 20 c.40. d.80

2.8 Moisture regain % of cotton, which has 7% moisture content,

will be approximately

a.6.5 b.7.0 c.7.5 d.9.0

2.9 The expected CV (%) of a 3-ply yarn produced form single yarns of 17.3% CV will
be approximately

a.10 b.15 c.17.3 d.20

2.10 Average number of 3 decitex fibres in a yarn of 20s English Count will be
approximately

a.10 b.50 c.100 d.200

2.11 If 100% cotton yarn of 15 tex is to be replaced by cotton/acrylic (70/30) blended

yarn of same twist and diameter then the linear density of blended yarn will be

a.11.7 tex b.12.7 tex c13.7 tex d.14.7 tex

2.12 Twist factor of a yarn in tex system is 50,the equivalent twist factor in metric
system will be

a.138 b.148 c.158 d.168

2.13 Higher rotor speed and smaller rotor diameter will require

a. Lower twist and higher opening roller speed

b. Lower twist and lower opening roller speed
c. Higher twist and higher opening roller speed
d. Higher twist and lower opening roller speed
2.14 Cylinder wire for high production card requires comparatively

a. Lower wire height and reduced free blade area

b. Lower wire height and increased free blade area
c. Higher wire height and reduced free blade area
d. Higher wire height and increased free blade area

2.15 Feeding of cotton flocks in clamped condition in blow room

a. Gives an intensive and good opening action

b. Gives an intensive but poor opening action
c. Gives gentle and good opening action
d. Gives gentle and poor opening action

2.16 Increases in conicity would lead to a package of

a. Harder nose and softer base

b. Softer nose and softer base
c. Softer nose and harder base
d. Harder nose and harder base

2.17 Large cross wound packages are usually wound on surface driven winders because
a. Precision winders would lead to patterning
b. Spindles of precision winders would not be able to withstand the increasing
centrifugal force caused bu the growing package
c. Continuous reduction in wind angle with increasing diameter would make the
precision wound package progressively unstable
d. Precision winding is uneconomical in view of the need of a control system for
continuous regulation of spindle speed

2.18 The front shed angle for weaving

a. Smooth yarns of low warp density is 15o

b. Smooth yarns of high warp density is 15o
c. Rough yarns of high warp density is 15o
d. Does not depends on type of yarns and warp density

2.19 A Seven-wheel take up motion can be classified as

a. Positive, indirect and intermittent

b. Positive, direct and intermittent
c. Negative, indirect and intermittent
d. Negative, direct and continuous

2.20 Introduction of tuck stitch into a single jersey construction makes the resultant
fabric

a. Lighter, thinner and wider

b. Lighter, thicker and narrower
c. Heavier, thicker and wider
d. Heavier, thicker and narrower
2.21 Enzyme desizing of cotton is carried out with the help of

a. Amylase b. Cellulase c. Lipase d.Protease

2.22 Molecular weight of dyes suitable for sublimation transfer printing of polyester is
in the range of

a.700 – 800 b.1000 – 1500 c.250 – 350 d.100 – 150

2.23 Reduction potential of sodium hydrosulphite under alkaline condition at room

temperature is

a. Higher than sodium sulphoxylate formaldehyde

b. Lower than sodium sulphoxylate formaldehyde
c. Equal to sodium sulphoxylate formaldehyde
d. Lower than sodium sulphide

2.24 Resist printing on cotton under reactive dyes is carried out at

a. pH 4-5 b. pH 7 c. pH 10-11 d. pH 14

2.25 Compounds based on nitrogen and phosphorous are used of

a. Water repellent finish b. Soil release finish

c. Anti-bacterial finish d. Flame retardant finish.
 SECTION A
(75 Marks)

TF 1 This question consists of TWENTY-FIVE sub-questions of ONE mark each. For

each of these sub-questions, four possible answers(A,B,C,D) are given, out of which
only one is correct. Answer each sub-question by darkening the appropriate bubble on
the OBJECTIVE RESPONSE SHEET(ORS) using an HB pencil.

1.1 The percentage of wax content in cotton fibre

a. Increase with decrease in linear density

b. Increases with increase in linear density
c. Increases with decrease in tenacity
d. Remains constant with decrease in linear density

1.2 The incorrect statement amongst the following is

a. Jute is multi-cellular fibre

b. Caprolactum is the raw material for Nylon 6
c. The density of PET is more than that of cotton
d. Viscose is a regenerated cellulosic fibre

1.3 Which one of the following fibres does not dissolve in concentrated Sulphuric acid

a. Acrylic b. Polypropylene c. Polyester d. Cotton

1.4 With an increase in relative humidity (RH), the strength of cotton fibre

a. Increases b. Decreases
c. Does not change d. First decreases and then increases

1.5 Melting point (TM) of PET is

a. More than that of acrylic b. More than that of Polyethylene

c. Less than that of Polypropylene d. Equal to that of Nylon 6

1.6 Which one of the following fibres in most resistant to attack by micro-organisms

a. Cotton b. Wool c. Jute d. Acrylic

1.7 Arrange the following fibres in the order of decreasing breaking extension: Silk,
Cotton, Hemp and Wool

a. Silk>Wool>Cotton>Hemp b. Wool>Silk>Cotton>Hemp
c. Wool>Silk>Hemp>Cotton d. Silk>Wool>Hemp>Cotton

1.8 The Partially oriented PET yarn is produced at spinning speeds of

a. Less than 1000 m/min b. 1500 – 3500 m/min

c. 5000 – 6000m/min d. Above 6000 m/min
1.9 The break draft used to process strongly twisted roving on ring frame is

a.1.1 – 1.25 b.1.3 – 1.5 c.2.0 – 3.0 d. >3.0

1.10 For the production of good quality yarn, the hardness of front roller cot is

a. More than that of back of roller b. Less than that of back roller
c. Equal to that of back roller d. Irrelevant

1.11 The length of lap feel per combing cycle in cotton combing is

a.1mm – 3 mm b.4mm – 6 mm
c.7 mm - 9 mm d.10mm – 12mm

1.12 The trash to lint ration in licker-in droppings is usually

a.60:40 b.40:60 c.80:20 d.90:10

1.13 The draft between licker-in and cylinder in a modern cotton card is

a.1.25 b.250 c.3.50 d.4.50

1.14 The bottom roller that carries apron has

a. Straight flutes b. Helical flutes c. Knurled surface d. Plane surface

1.15 The final package conicity of a foster cone meant for knitting is

a.110 b.5057’ c.4020’ d.20

1.16 The magazine creel is employed for

a. Long run of the same warp

b. Quick change over from one warp to another
c. Saving space d. Saving energy

1.17 Single-end sizing involve

a. Sizing of yarn sheet drawn from one beam only

b. Sizing of only one yarn at a time
c. Sizing of a yarn sheet with very low yarn density
d. Sizing with very low concentration of liquor

1.18 Limitations to the weft inserting rate of a plain loom is imposed by

a. The loom eccentricity b. The picking and checking systems

c. The width of the loom d. The mass of the sley
1.19 A very even fabric of 50 grams per square meter, produced at the rate of 1000
m2/h, can the manufactured by

a. Weaving process b.Weft knitting process

c. Needle punching process d. Spun bonding process

1.20 The concentration (%) of mercerizing caustic solution is in the range

a. 5 – 10 b.11-15 c.16 – 20 d. 21- 25

1.21 The strength of hydrogen peroxide solution ( in volumes) used for bleaching of cotton
is in the range

a. 0.5 – 1.5 b.2.0 – 4.0 c.4.5 – 6.0 d.6.5 – 8.0

1.22 The cationic dyes are commonly applied on

a. Cotton b. Nylon c. Polyster d. Acrylic

1.23 The disperse reactive dyes were developed for

a. Cotton b. Nylon c. Polypropylene d. Polyster

1.24 Compared to the untreated fabric,the water repellent treated fabric will

a. Appear softer b. Appear stiffer

c. Show no change in the handle d. Be yellower

1.25 THPC is a

a. Softener b. Carrier c. Levelling agent d. Flame retardant

 SECTION- A [25*2=50]

TF 2 This question consists of TWENTY FIVE sub-questions of TWO mark each. For
each of these sub-questions, four possible answers(A,B,C,D) are given, out of which
only one is correct. Answer each sub-question by darkening the appropriate bubble on
the OBJECTIVE RESPONSE SHEET(ORS) using an HB pencil.

2.1 When a load of 245 cN breaks a 50 denier yarn, the breaking length of the yarn is

a.1800 metres b.4500 metres c.9000 metres d.45000 metres

2.2 The rate of crystallization of unoriented PET spun yarn

a. Is maximum near its glass transition temperature(Tg)

b. Is maximum near its melting temperature (Tm)
c. Is maximum at a temperature between Tg and Tm
d. Increases with increases in temperature from Tg to Tm

2.3 If 5 grams of a bone dry fibre absorbs 1.25 grams of moisture under the standard
conditions (65% rh,20 0c), the moisture regain (MR) and moisture content (MC) of the
fibre are

a. MR = 25% and MC = 23.8%

b. MR = 23.8% and MC = 25%
c. MR = 23.8% and MC = 23.8%
d. MR = 25% and MC = 25%

2.4 A sample ‘F’ is a physical mixture of two fibres.The analysis of the mixture shows the
following characteristics: Mixed odour on burning; Partial dissolution in N,N dimethyl
formamide; Presence of nitrogen and absence of sulphur;no dissolution in 59%(w/w)
sulphuric acid and Complete dissolution in concentrated sulphuric acid. Based on
above observations the components of the mixture can be

a. Viscose and wool b. Cotton and acrylic

c. Viscose and acrylic d. Cotton and wool

2.5 In a typical X-ray diffraction plot of a semi crystalline fibre,the total area of diffraction
pattern has been divided into two parts – area of crystalline component and area of
amorphous component. If the area corresponding to crystalline and amorphous
components are 15 units and 39 units respectively, the percentage crystallinity of
sample is

a.0.33 b.33.3 c66.6 d.50.0

2.6 If the ratio of bare bobbin to ring diameter is 0.5,the winding angle is

a. 300 b. 250 c. 200 d. 350

2.7 The twist in the yarn arm within the rotor is

a. Equal to that of final yarn b. Less than that of final yarn

c. More than that of final yarn d. Zero

2.8 The spinning tension is lowest in

a. Ring spinning b. Roter spinning

c. Air-jet spinning d. Twist-less spinning

2.9 As twist is removed from motor yarn

a. The strength continuously decreases

b. The strength decreases at first and then increases again
c. No change in strength occurs
d. The strength increases at first and then decreases

2.10 Two yarns of 12s Ne and 16s Ne are plied together. What will be the resultant
count?(Ignore any change in length due to plying)

a. 14s Ne b. 12.8s Ne c. 6.8s Ne d. 13.5s Ne

2.11 The blow room and card cleaning efficiencies are 60% and 90% respectively. If the
trash present in card sliver is 0.08%,what was the trash level in the bale?

a. 2.4 b. 2.0 c.3.0 d.2.8

2.12 Twisting and winding operations are inseparable in

a. Rotor spinning b. Ring spinning

c. Friction spinning d. Air-jet Spinning

2.13 The relation between the cloth cover and sir permeability is

a. Linear b. Exponential c. Parabolic d. Hyperbolic

2.14 If the cloth is of 150 grams per square meter and its bending length in the warp
direction is 3cm, then its corresponding flexural rigidity in g.cm would be

a.0.405 b.4.050 c.4.500 d.4500.0

2.15 The doffing period in minutes of a 1.5kg package being wound at a winding speed
of 1000 m/min with 90% efficiency from 12 tex yarn would be

a.131.7 b.138.8 c.143.2 d.147.5

2.16 With one break per million meters of yarn wound, a beam warper running from a 600
end creel of 15 tex yarn would stop every

a.1500m b.1567m c.1600m d.1667m

2.17 100 kg of bone dry warp sized to a dry pick up of 8% and dried to an overall moisture
content of 10% would finally weigh

a.118kg b.118.8kg c.119kg d.120kg

2.18 A loom running at 200 rpm with 80% efficiency and inserting 60 picks per inch would
produce in one hour a length of fabric equal to

a.3.06m b.3.56m c.4.06m d.4.56m

2.19 If the warp cover factor is 22 and the weft cover factor is 16 then the cloth cover
factor is

a.23.24 b.24.41 c.25.43 d.26.17

2.20 When the wet pick-up during padding is reduced from 100% to 505,the energy
required to evaporate one kilogram of water will

a. Increase b. Decrease
c. Remain the same d. Show no definite trend

2.21 The presence of metal ions during H202 bleaching

a. Increases the decomposition rate of the H202 which is good for bleaching
b. Decreases the decomposition rate of the H202 which is good for bleaching
c. Increases the decomposition rate of the H202 which is not good for bleaching
d. Decreases the decomposition rate of the H202 which is not good for bleaching

2.22 Thermodynamically, dyeing is

a. An endothermic process
b. An exothermic process
c. An athermic process
d. An exothermic process in the beginning and turns endothermic after some time
2.23 The reactive dyes are designed to have

a. Poor to moderate substantively for cellulose

b. Moderate to excellent substantivity for cellulose
c. Outstanding substantivity for cellulose
d. Outstanding substantivity for polyester

2.24 One Remazol brand and one basic dye have been given to a printer for producing a
discharge printed silk sari.For this

a. Basic dye should be used for the ground shade and Remazol
as the illuminating colour
b. Remazol should be used for the ground shade and
the basic dye as the illumination colour
c. Either of the dyes can be used for either purpose
d. None of these dyes id suitable

2.25 On treating with NaOH solution, the flame retardancy of the phosphorylated cotton
fabric

a. Increases b. Decreases
c. Remains the same d. Decreases initially and the increases