Textile Science Question Paper 2013

Exam Year:2013

The Kenya National Examinations Council
Diploma in Clothing Technology
Textile Science
3 hours

Answer Any Five Questions

l. (a) Study the fabric structure below and determine the following:
(i) the type of weave; (1 mark)
(ii) the designation of the weave; (1 mark)
(iii) five characteristics of the weave. (5 marks)
(b) Outline five limitations of each of the following:
(i) linen; (5 marks)
(ii) silk. (5 marks)
(c) Explain the term ”scouring” as used in cotton fabric production, citing one objective. (3 marks)
2. (a) Explain the following fabric finishes:
(i) burling; (2 marks)
(ii) antislip; (2 marks)
(iii) chlorination; (2 marks)
(iv) mercerization. (2 marks)
(b) Explain the production process of acetate fibres. (10 marks)
(c) Describe the term ”roving” in yarn production. (2 marks)
3. (a) (i) Explain the term ”slub dyeing”. (2 marks)
(ii) Outline three desirable qualities of dyed fabrics. (3 marks)
(b) Describe the discharge printing process.
(c) Highlight seven advantages and five disadvantages of nylon fabrics. (12 marks)
4. (a) State three functions of each of the following in laundry:
(i) sunlight; (3 marks)
(ii) Ironing. (3 marks)
(b) Illustrate the care label symbol for each of the following instructions:
(i) do not bleach; (1 mark)
(ii) do not dry clean; (1 mark)
(iii) do not tumble dry; (1 mark)
(iv) use cool iron; (1 mark)
(v) drip dry. (1 mark)
(c) Distinguish between each of the following in silk production:
(i) weighting and degumming; (2 marks)
(ii) reeling and throwing. (2 marks)
(d) (i) Explain the term ”selvedge”. (2 marks)
(ii) Identify three types of selvedges. (3 marks)
5. (a) State the effect of acetone on each of the following:
(i) viscose; (1 mark)
(ii) triacetate. (1 mark)
(b) With the aid of illustrations, describe the longitudinal microscopic appearance
of each of the following:
(i) linen; (3 marks)
(i i) wool; (3 marks)
(iii) unmercerized cotton. (3 marks)
(c) (i) Outline four objectives of the carding operation in cotton yarn production. (4 marks)
(ii) Highlight three objectives of stretching in nylon yarn production. (3 marks)
(d) Distinguish between ”pre-shrinking” and ”residual shrinking” in fabrics (2 marks)
6. (a) Outline three objectives of ”stiffening” as a fabric finish. (3 marks)
(b) With the aid of a labelled diagram, describe the wet spinning process. (7 marks)
(c) Explain the procedure for ironing a cotton shirt. (6 marks)
(d) Highlight four points to consider before and when hanging clothes on a drying line. (4 marks)
7. (a) (i) Describe the term ”fullfashioning” in knitting. (3 marks)
(ii) Highlight three advantages of warp knits over weft knits. (3 marks)
(b) Identify the following knitted fabric faults:
(i) ladder; (1 mark)
(ii) bowing; (1 mark)
(iii) float; (1 mark)
(iv) press-off. (1 mark)
(c) Outline six desirable qualities of suitable fabrics for lingerie. (6 marks)
(d) Identify the generic group of each of the following fibres:
(i) nylon; (1/2 mark)
(ii) crimplene; (1/2 mark)
(iii) lurex; (1/2 mark)
(iv) orlon; (1/2 mark)
(v) courtelle; (1/2 mark)
(vi) dacron; (1/2 mark)
(vii) spanzelle; (1/2 mark)
(viii) asbestos. (1/2 mark)

8. (a) Highlight five limitations of pile fabrics during usage. (5 marks)
(b) Explain the term ”mixing” in fabric formation, citing three disadvantages. (5 marks)
(c) State the number of shafts required to produce each of the following woven
fabric structures:
(i) ) 4/1 twill weave; (1 mark)
(ii) 3/3 twill weave; (1 mark)
(iii) 1/1 plain weave. (1 mark)
(d) (i) Explain the term ”dry cleaning”. (2 marks)
(i i) Highlight three advantages and two disadvantages of dry cleaning. (5 marks)

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