APM401 Basics of Chemical Processing of Textiles B.Tech Question Paper : wbut.ac.in

Name of the University : West Bengal University of Technology
Department : Apparel Production Management
Degree : B.Tech
Sem : IV
Subject Code/Name : APM-401/Basics Of Chemical Processing Of Textiles
Website : wbut.ac.in
Document Type : Previous Year Examination Question Paper

Download Model/Sample Question Paper :
2012 : https://www.pdfquestion.in/uploads/qpaper.wbut.ac.in/6327-2012APM-401(4).pdf
2013 : https://www.pdfquestion.in/uploads/qpaper.wbut.ac.in/6327-2013APM%20-%20401(1).pdf

WBUT Chemical Processing Textiles Question Paper

Time Allotted : 3 Hours
Full Marks : 70
** The figures in the margin indicate full marks.
** Candidates are required to give their answers in their own words as far as practicable.

Related : West Bengal University of Technology APM404 Textile Wet Processing-II B.Tech Question Paper : www.pdfquestion.in/6322.html

GROUP – A

( Multiple Choice Type Questions )
1. Choose the correct alternatives for the following : 10 × 1 = 10
i) Degree of cross linking in the polymer system of a fibre significantly influences that fibre’s
c) Elastic-plastic nature and tenacity
d) Crystallinity.

ii) Polyester produced by micro-organisms is
a) Polyethylene terephthalate
b) Polyhydroxy alkanoate
c) Polyhydroxy lactanoate
d) Polyhydroxy caprolactone.

iii) Auxochrome tends to be
a) Polar b) Non-polar
c) Inert d) Hydrophilic.

iv) Molecules of fluorescent brighteners contain
a) Covalent bonds
b) Conjugated bonds
c) Hydrogen bonds
d) Co-ordinate bonds.

v) Fabrics having wavy selvedges can be signed by
a) Roller singeing machine
b) Plate singeing machine
c) Gas singeing machine
d) Diffused infrared radiations.

vi) The P/C fabric to be desized is impregnated with a solution of a desizing enzyme kept at 60°-70°C allowing at least
a) two dips in the liquor
b) three dips in the liquor
c) four dips in the liquor
d) five dips in the liquor.

vii) The M: L in kier is usually
a) 1 : 10 b) 1 : 20
c) 1: 40 d) 1 : 5.

viii) In case of P/C blends the fabric is scoured continuously in
a) Vaporlok type machine
b) Winch machine
c) Jigger machine
d) Jet dyeing machine.

ix) If 3% shade is required to be dyed on 4 grams of cotton yarn using a solution of 1 gram of dye in 200 ml water ( i.e., 0·5 gram in 100 ml water ), the stock dye solution required would be
a) 26 ml b) 24 ml
c) 28 ml d) 34 ml.

x) Remazol dyes react with cellulose by the mechanism of
a) Nucleophilic addition
b) SN1
c) SN2
d) Summarmann substitution.

GROUP – B

( Short Answer Type Questions )
Answer any three of the following : 3 × 5 = 15
2. Explain why —
a) nylon is flexible but polyester is rigid.
b) cotton is highly crystalline in nature but still it is used as a good summer garment. 2 + 3

3. a) What do you understand by the terms ‘Auxochrome’ and ‘Chromophore’ ?
b) Why is a pinch of soda ash added during pasting of direct dye ?
c) How is the efficiency of mercerization determined ? 1 + 2 + 2

4. a) Why is soaping essential in case of sulphur dyeing ?
b) Nylon fibre is particularly susceptible of uneven dyeing. Why ?
c) Write the time-temperature profile of cold brand reactive dye. 1 + 2 + 2

5. a) What is the ideal process sequence used in textile wet processing ?
b) Why is there a difference between scouring of cotton and wool ?
c) Write the stepwise hydrolysis of starch. 2 + 2 + 1

6. a) Both wool and silk and protein fibres but in what respect are they different from each other ? Mention a confirmative test to identify wool from silk.
b) Differentiate between dyeing and printing. 3 + 2
7. a) Name the basic styles of printing and differentiate between them.
b) What is a motif ?
c) Write the difference between a dyestuff and a pigment. 2 + 1 + 1

GROUP – C

( Long Answer Type Questions )
Answer any three of the following : 3 × 15 = 45
8. a) What is the objective of singeing ?
b) Describe with a neat sketch the different types of singeing machines with relative merits and demerits. 2 + 13

9. a) Why is desizing essential ? What kind of material is present in the size ? Name different methods of desizing. Describe the hydrolytic desizing process with relative merits and demerits. 2 + 1 + 2 + 5
b) What is enzyme ? Write the names of different enzymes of different sources mentioning concentration, pH and temperature for their specific use. 1 + 4