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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]

1.1A fibre was heated with soda lime in a test tube. When vapours thus produced werecontacted 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

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

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

1.3The end groups in PET area. Carboxyl b. Hydroxyl

c. Carboxyl and hydroxyl d. Carboxyl and Amino

1.4The fibre that does not shrink when taken near the flame isa. Polypropylene b. Acrylic c. Acetate d. Viscose

1.5Which fibre dissolves at room temperature in methylene chloride?a. Viscose b. Acetate c. Triacetate d. Calcium Alginate

1.6Which of the following is extremely sensitive to photodegradation?a. Polyester b. Nylon c. Polypropylene d. Cotton

1.7Neps on User evenness tester is based on change in mass over a length osa.1 mm b.2 mm c.4 mm d.8 mm

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

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

N N2 N

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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 - 50 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, theback-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 toa.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 isa.0.15 b.0.30 c.0.45 d.0.60

1.15 The spinning tension in g/tex in ring spinning isa.1.0 b.2.5 c.3.0 d.4.6

1.16 The maximum twist in rotor spinning isa. 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 thana. Ring yarn b. Rotor yarn

c. Friction yarn d. None of the above

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1.18 If V is the unwinding speed, tension in the yarn is proportional toa. V b.V

2c. 1 d. 1

V V2

1.19 Size is primarily applied on warp toa. 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 toa. P b. P

2c. P

3d. P

4

1.21 Type of selvedge formed on Sulzer projectile loom isa. Conventional b. Fringe c. Tucked-in d. Sealed

1.22 Production rate will be maximum in case of the manufacture ofa. 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 isa. An exhausting agent b. A reducing agentc. A mild oxidizing agent d. A leveling agent

THPC is a

a. Water repellent b. Carrier

c. Anionic wetting agent d. Flame retardant