Pune University BE Polyer Engineering Fiber Technology Question Papers

Pune University BE Polymer Engineering Fiber Technology Question Papers

B.E. (Polymer) FIBER TECHNOLOGY (2008 Pattern) (Sem. – I) (Elective – I)

Time: 3 Hours]                                                                                              [Max. Marks :100

Instructions to the candidates:

1)            Answers to Section -1 and Section – II should be written in separate answer book.

2)             Solve 3 questions from Section -1 and 3 questions from Section – II.

3)            Neat diagrams should be drawn wherever necessary.

4)            Figures to the right indicate full marks.

5)            Assume suitable data, if necessary.

6)            Use of electronic pocket calculator is allowed.

SECTION – I

Q1) a) Briefly explain the unique properties of Synthetic compared to Natural Fibers?    [9]

b)            What is the significance of polymerization step in fiber manufacture? [3]

c)            Enlist the important points to be considered in production of PET by continuous process.                                                                                                       [6]

OR

Q2) a) With suitable flow diagram explain the important operations in the production of polyester filament yarn.                                                                                   [6]

b)           What are the molecular requirements the given polymer should possess in order to convert it into fiber?                                                                                 [6]

c)            Define the following terms – fiber, tenacity, denier, filament, yarn, staple fiber          [6]

Explain the effect of high speed spinning on the fiber morphology. [6] What are the functions of pre-filtration device that has been placed between static mixer and manifold in case of melt spinning operation.

[5]

Briefly explain the role of spin pack and spinneret in fiber forming operation.      [5]

OR

Explain in brief H4S and FDY spinning processes of Spin Draw technique.          [8]

What are various techniques of Solution Spinning? Explain any one in detail.      [8]

Enlist various post-spinning operations in fiber formation.                       [4]

What are the various factors affecting friction generated during manufacturing fiber? Explain any one in detail.                                                                                                        [8]

Explain the importance of stretching/drawing stage in fibers. [4]

OR

What are the major constituents of spin finish used in fiber? Briefly explain their significance. [8]

What do you understand by Draw Warping? What are its advantages?

[8]

SECTION – II

Write a short note on Crystal Defect model in fibers.                                 [6]

Compare between Crush Cutting and Stretch Breaking Converters used for converting polyester tow into tops.                                                                                                       [6]

Explain the Heat setting step and its effect of staple fiber.                         [6]

 

Q8) a) Write a short note on Transitions in Fiber Structure.                       [6]

b)            Explain in detail One step continuous plant for melt spun staple fiber production.     [7]

c)            Comment on Chain folding and Fiber annealing.                                        [5]

Q9) a) What are the various methods of Mass Colouration of Polyester? Explain any one in detail.                                                                                                          [10]

b) Why is it difficult to dye PP fibers? What are the various modifications carried out to make dyeable PP?                                                                                    [6]

OR

Q10)a) Explain Chips Dyeing technique used for Mass colouration of Nylon.

b)            What are the factors those make polyester fibers difficult to dye? [4]

c)            Write a short note on Carrier dyeing technique used for polyesters. [6]

Q11)a) Explain the necessity of modifying synthetic fibers.                     [6]

b)            Write a short note on Hydrophilic Polyester.                                                [7]

c)            Enlist applications of flame retardant synthetic fibers.                               [3]

OR

Q12)a) Enlist the important tests performed for checking quality of filament yarns and staple fibers. Explain any one in detail.                                                               [8]

b) Write a short note on Hydrophilic Acrylic fibers.                                             [8]

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