Question

Caustic soda mercerization of cotton is carried out for improvement a of

a. Strength and luster

b. Whiteness c. Wetting

Ans :

a. Strength and luster

Scouring of cotton is carried out under

a. Alkaline conditions

b. Acidic conditions

c. Neutral conditions

Ans:

a. Alkaline conditions

Acid dyes on nylon are held by

a. Electrostatic attraction

b. hydrogen bonding

c. Vander waal’s forces

Ans :

a. Electrostatic attraction

Dyes suitable for sublimation transfer printing are

a. acid dyes

b. disperse dyes

c. direct dyes

Ans:

b. disperse dyes

Chemical suitable for discharge printing is

a. Zirconium sodium sulphoxylate formaldehyde

b. Hydorgenperoxide

c. Sodium silicate

Ans :

a. Zirconium sodium sulphoxylate formaldehyde

The processes for sanforization is used for

a. Improvement in strength

b. Dimensional stability

c. Improvement in crease recovery

Ans:

b. Dimensional stability

Decatising process is used for finishing of

a. Cotton

b. polyester

c.Wool

Ans:

c.Wool

Limiting oxygen index is determined to test the efficiency of

a. Wash and wear finishing

b. Water proofing

c. Flame retardant finishing

Ans:

c. Flame retardant finishing

Jet-dyeing machine is commonly used for dyeing of

a. Wool

b. Cotton c. Polyester

Ans:

c. Polyester

Descending order of density

a. Cotton

b. Polyprolyene

c. Nylon

d. Polyester

Ans:

Cotton - 1.54–1.56 g/cm³.

Polyester - 1.45 g/cc.

Nylon - 1.15 g/cm3

Polyprolyene - 0.855 g/cm3

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

Ans:

iii. 0.2 to 1.2

When twist is increased in a spun yarn, its strength

i. increases

ii. decreases

iii. does not change

iv. first increases and then decreases

Ans:

iv. first increases and then decreases

The RKm of a yarn is equal to

i. g/tex

ii. g/den

iii. Breaking length in Km

iv. CSP

Ans:

iii. Breaking length in Km

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

Ans:

ii. For producing striped fabrics

Sizing gives to the yarn

i. Higher breaking strength

ii. Increased elongation at break

iii. Increased pliability

iv. None of the above

Ans:

ii. Increased elongation at break

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

Ans:

iii. Exhausted weft bobbin is replaced automatically

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

Ans:iii. Position of immersion roller is

lowered

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

Ans:

i. Raising the back rest

Drawing

i. Increases crystallinity

ii. Increases birefringence

iii. Decreases crystalline

iv. Increase strength

Ans:

ii. increases birefringence

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

Ans:

iv.80 – 120 m/min

The desizing process mainly removes

i. Wax and tallow

ii. Dirt and colour

iii .Starch

iv. Natural impurities

Ans:

iii .Starch

Batch-wise scouring can be carried out in

i. Winch

ii. Jigger

iii. Kier

iv. J-Box

Ans:

iii. Kier

The most important ingredient of a scouring composition is

i. Wetting agent

ii. Alkali

iii. Emulsifying agent

iv. Sodium silicate

Ans:

ii. Alkali

Wool and silk can be bleached with

i. Sodium hydrosulphite

ii. Sodium perborate

iii. Hydrogen peroxide

iv. Sodium hypochlorite

Ans:

iii. Hydrogen peroxide

Mercerization is carried out with NaOH of

i.10 – 15% Conc.

ii.18 – 25% Conc.

iii.5 – 10% Conc.

iv.25-35% Conc.

Ans:

ii.18 – 25% Conc.

An optical brightener is

i. A synthetic bluing agent

ii. A colorless dye

iii. A fluorescent compound

iv. An optical whitener

Ans:

ii. A colorless dye

Uster classimat in for classifying

a.Yarn faults

b.Yarn imperfections

c.Yarn irregularity

Ans:

a. Yarn faults

Singeing of cotton is carried out to

a. Remove protruding fibres from fabrics surface

b. Impart luster

c. Cut long threads from fabric surface

Ans:

a. Remove protruding fibres from fabrics surface

Hydrogen peroxide bleaching is carried out of

a. room temperature

b.50-60°C

c.80-100°C

Ans:

c.80-100°C

Mercerization of cotton is carried by using

a. Sodium hydroxide

b. Sulphuric acid

c. Acetic acid

Ans:

a. Sodium hydroxide

Dyeing of polyester is carried out by using

a. Acid dyes

b. direct dyes

c. Disperse dyes

Ans:

c. Disperse dyes

Vinyl sulphone Reactive dyes are applied on cotton under

a. alkaline pH

b. neutral pH

c. acid pH

Ans:

b. neutral pH

Acid Dyes are held on Nylon by means of

a. Electrostatic force

b. Covalent bond

c. Vander Wall force

Ans:

a. Electrostatic force

The most productive method for textile printing is

a. Rotary screen-printing

b. Automatic Flat-bed screen-printing

c. Block printing

Ans:

a. Rotary screen-printing

Fixation of Disperse Dyes on Polyester is carried out of

a. atmospheric steaming

b. pressure steaming

c. curing at 140oC for 5 minute

Ans:

c. curing at 140oC for 5 minute

The more common agents used for discharge printing are

a. oxidizing type b. reducing type

c. Neutral in reaction

Ans:

a. oxidizing type

Artificial silk is

(a) Rayon

(b) Polyester

(c) Acrylic

(d) Acetate

Ans :

(a) Rayon

Polyester is referred as

(a) Dupont

(b) Work horse

(c) Cellulose acetate

(d) Acrylic

Ans:

(b) Work horse

Spun yarns are

(a)Smooth

(b)Lustrous

(c)Dull

(d)Cool

Ans

Dull

Filamentous yarns are

(a)Smooth

(B) Dull

(c) Soft

(d) Short

Ans:

Smooth

Textured yarns are(a)Straight

(b)warm

(c)continuous

(d)spun

Ans:

continuous

Novelty yarns are usually

(a)Boucle yarn

(b)Textured yarn

(c)Ply yarn

(d)Card yarn

Ans:

Ply yarn

Spinning of yarn means

(a)Denier

(b) Twisting

(c) Tex

(d) Pulling

Ans:

Twisting

The fabric come out from the loom is known as

a. Grey goods

b Gray goods

c Mercerized good

d none of the above

Ans:

a. Grey goods

Which type of weave produces lustrous surface?

a. Twill

b. Satin

c. Jacquard

d. Pile weave

Ans:

b. Satin

Yarn count of silk is expressed in

a. Counts

b. Denier

c. Skein

d. None of the above

Ans:

b. Denier

Repeat size is a sum of

a)Warp floats

b)Weft floats

c)Both warp & weft floats

d)None of the above

Ans:

Both warp & weft floats

The basic elements of woven design are

a)Design & draft.

b)Draft &peg plan.

c)Peg plan & denting plan.

d)Design, draft, peg plan

Ans:

Design, draft, peg plan

In straight draft : ------------- = ---------------

Design = draft.

Draft = peg plan.

Peg plan = Denting plan.

None of the above

Ans:

Draft = peg plan.

The plain Weave is variously known as ________

a)Crepe

b)Grecians

c)Cretonne

d)Calico

Ans:

Calico

Texture is related to ____

(a) Count of yarn

(b) Relative density of threads

(c) Both (a) & (b)

(d) None of these

Ans:

Both (a) & (b)