Preparatory Processes - Chemical Processing - Textile Engineering & Fibre Science Previous Year Questions

1

2007 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2007

With an increase in the sizing machine speed, size add-on would

A

Increase

B

Decrease

C

Remain constant

D

Increase initially and then decrease

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2

2007 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2007

Bleaching of cotton fabrics is commercially done using

A

Sodium Bisulphite

B

Sodium Chlorate

C

Sodium Chlorite

D

Sodium Chloride

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3

2007 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2007

The typical enzyme/s used for desizing is/are

A

Peptidase

B

Cellulase

C

Mixture of Peptidase and Cellulase

D

Amylase

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4

2007 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2007

Sizing of a spun yarn normally does not

A

Increase yarn strength

B

Reduce yarn hairiness

C

Increase yarn extension

D

Improves weavability

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5

2007 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2007

Wool scouring is normally done

A

In fibre form

B

In organic solvent

C

At boil in the presence of caustic soda

D

In fabric form

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6

2008 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2008

Sizing of warp yarn

A

Adds value to warp yarn

B

Improves weavability

C

Increases the strength of finished fabric

D

Increases breaking extension of the sized yarn

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7

2008 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2008

Singeing of cotton fabrics results in

A

Improved strength

B

Decreased crease recovery

C

Increased bending rigidity

D

Improved performance during printing

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8

2008 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2008

Souring is done to

A

Remove size

B

Neutralize the substrate after alkaline treatment

C

Remove colourant

D

Remove Wax

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9

2008 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2008

The essential step/s in carbonization of wool is / are treatment with

A

Dilute sulfuric acid and baking

B

Reducing agent followed by antichlor treatment

C

Carbon tetrachloride

D

Activated carbon

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10

2008 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2008

Excessive size makes the warp yarn

A

Stiffer

B

More extensible

C

More hairy

D

Better from the point of weaving

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11

2008 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2008

Damage to cotton due to bleaching CANNOT be estimated by

A

Methylene Blue Absorption

B

Barium Number

C

Cupranmonium Fluidity

D

Tensile Strength

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12

2009 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2009

Size is primarily applied on warp yarns to

A

Increase yarn uniformity

B

Increase yarn elongation

C

Increase yarn modulus

D

Provide protective coating against abrasion

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13

2009 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2009

Desizing of a grey cotton fabric having starch based size can not be done using

A

Amylase enzyme

B

dilute HCl

C

Hydrogen peroxide

D

DMDHEU

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14

2009 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2009

Consider the following statements :
P. Presence of iron and copper ions during bleaching with sodium chlorite is desirable.
Q. Sodium silicate is used as a stabilizer in bleaching of cotton with hydrogen peroxide.
R. Oil repellent finishes are based on fluorochemicals.
S. Sodium hydrosulphite is used as a reducing agent in vat printing.
Choose the correct set of statements from amongst the alternatives A, B, C and D.

A

P, S

B

Q, S

C

P, R

D

Q, R

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15

2009 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2009

The optimum conditions for bleaching cotton with hydrogen peroxide are

A

pH 7, 60°C

B

pH 7, boil

C

pH 10, 60°C

D

pH 10, boil

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16

2010 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2010

Size add-on is NOT influenced by

A

Machine speed

B

Squeeze pressure

C

Size paste concentration

D

Drying cylinder temperature

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17

2010 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2010

In bleaching with H₂O₂ the active oxidizing species is

A

Water

B

Perhydroxyl ion

C

Hydrogen

D

Hydroxyl ion

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18

2010 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2010

Choose the correct statement (s)
To get uniform impregnation of chemicals on cotton through minimum application techniques
(P) Material should be uniformly scoured
(Q) Material should be bone dry
(R) Material should contain optimum moisture
(S) Material should be uniformly bleached

A

P, R

B

P, Q, R

C

P, Q

D

P

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19

2011 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2011

The machine used for continuous processing of fabric is

A

Winch

B

Kier

C

J-Box

D

Jigger

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20

2011 · Textile Engineering & Fibre Science · Chemical Processing · Preparatory Processes

Textile Engineering & Fibre Science (TF) 2011

For a sizing process, the target add-on (%) and the size paste concentration (%) is 10 and 20, respectively. If the oven dry mass of the supply warp sheet is 100 kg, the mass of water in kg to be evaporated from the warp sheet during drying is ______________________

Check answer

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