Download GTU BE/B.Tech 2019 Winter 4th Sem New 2142904 Fibre Physics Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER- IV (New) EXAMINATION - WINTER 2019

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Subject Name: Fibre Physics

Subject Code: 2142904

Date: 07/12/2019

Time: 10:30 AM TO 01:00 PM

Total Marks: 70

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Define the terms: Load, Stress, Tenacity. (03 MARKS)

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   2. Explain about Constant rate of traverse testers. (04 MARKS)
   3. What is Creep & Relaxation? Discuss primary and secondary creep. Also explain experiments on creep. (07 MARKS)
2. 1. Write short note on Irreversible shrinkage. (03 MARKS)
   2. Explain principle of Bowden and Leben’s apparatus for study of friction. (04 MARKS)

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   3. Explain clausius clapeyron equation for water vapour. (07 MARKS)

   OR

   1. With a neat sketch, explain morphological structure of cotton. (07 MARKS)
   2. Explain about Refractive index. (03 MARKS)
   3. Discuss in brief about Elastic recovery. (04 MARKS)

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3. 1. Define the terms: absolute humidity, relative humidity, moisture regain, moisture content with suitable examples. Discuss on Hysteresis. (07 MARKS)

   OR

   1. Enlist the sources of evidence of fibre structure. (03 MARKS)
   2. Write short note on birefringence. (04 MARKS)

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   3. Explain with neat sketch Fourier_transform infrared spectrometers (FTIR). (07 MARKS)
4. 1. Explain in brief about Electrical resistance. (03 MARKS)
   2. Write short note on reflexion and luster. (04 MARKS)
   3. Discuss about Dielectric‘properties. (07 MARKS)

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   OR

   1. Discuss requirements for fibre formation from linear polymers. (03 MARKS)
   2. Depict various physical and chemical properties of nylon fibers in context to their structure. (04 MARKS)
   3. Explain Buckle and Pollitt’s method for measurement of Fiber Friction. (07 MARKS)

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5. 1. Describe “Work factor”. (03 MARKS)
   2. Enlist the applications of electron microscopy. (04 MARKS)
   3. Explain with neat sketch Density measurement technique. (07 MARKS)

   OR

   1. Discuss directional friction in Wool. (03 MARKS)

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   2. Discuss the Thermal Expansion. (04 MARKS)
   3. Define swelling. Give methods of measurement of different types of swelling. (07 MARKS)

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