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Material Science Question Paper

Material Science

Course:

Exam Year:2006

INSTRUCTIONS TO CANDIDATES.
1.This paper consists of EIGHT questions.
2.Answer any FIVE questions.
3.Each question carries 20 marks.
1.(a) (i) State FOUR impurities found in wool fibers.(2 marks)
(ii) Distinguish between shoddy and mungo fibers.(2 marks)
(b) Explain FIVE causes of inhomogenity in the characteristics of natural plant fibres.(10 marks)
(c) Distinguish between woolen and worsted yarns.(3 marks)
(d) Describe resiliency of a textile material.(3 marks)

2.(a) State FIVE reasons for sewing synthetic fabrics with synthetic thread.(10 marks)
(b) Describe the production of silk filaments.(10 marks)
3.(a) (i) Outline THREE effects of overtwisting acetate yarns.(3 marks)
(ii) State TWO differences between open-end spun yarn and ring spun yarn.(2 marks)
(b) With the use of labeled sketches describe the TWO twist directions in yarns.(5 marks)
(c) Explain FIVE objectives for drafting fibres.(10 marks)

4.(a) Explain the term "grey fabrics".(2 marks)
(b) Describe the following types of fabrics:-
(i) Denim (2 marks)
(ii) Corduroy (2 marks)
(iii) Seer sucker.(2 marks)
(c) Describe the following types of fabric faults:-
(i) knots (2 marks)
(ii) mis-end (2 marks)
(iii) Floats (2 marks)
(iv) Oil stains.(2 marks)
(d) Explain the importance of sizing.(4 marks)

5.(a) Outline SIX properties of felted fabrics that make suitable in industrial and domestic application.(6 marks)
(b) State FOUR control factors in pressing of fabrics using steam press machines.(4 marks)
(c) (i) Describe mercerization process.(3 marks)
(ii) State SEVEN characteristics of mercerized fabrics.(7 marks)

6.(a) (i) State SIX classes of textile dyestuffs.(3 marks)
(ii) Compare hank dyeing to cone dyeing.(4 marks)
(b) (i) State FOUR control factors in printing process.(4 marks)
(ii) Describe batik method of coloration.(5 marks)
(c) Describe the following fabric finishes;
(i) Crease resistance (2 marks)
(ii) Water repellant (2 marks)

7.(a) Describe carbonizing process of wool fabrics.(4 marks)
(b) Explain the bleaching process during fabric manufacture.(6 marks)
(c) State TWO reasons for use of stiffening agents in laundry work.(2 marks)
(d) State SIX colour fastness tests.(3 marks)
(e) Describe 'fulling process'.(5 marks)

8.(a) (i) Describe how a fruit stain is removed from a viscose rayon garment.(2 marks)
(ii) Draw THREE labeled symbols for drying methods.(3 marks)
(b) Describe how a washing machine with a wringer operates.(4 marks)
(c) explain FOUR qualities required for fabrics used to make childen's wear.(8 marks)
(d) Outline the procedure for carrying out a wicking test of a fabric.(3 marks)

Material Science Question Paper

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