Download GTU BE/B.Tech 2018 Winter 7th Sem New 2172307 Frp Technology And Composites Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018

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Subject Code: 2172307

Subject Name: FRP Technology and composites

Time: 10:30 AM TO 01:00 PM

Date: 29/11/2018

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. MARKS

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   1. (1) Resin injection molding is an intermediate process between molding and molding. (2) List any two inhibitors used for the Polyester resin. (3) techniques is used for manufacturing pipes, tubes, cylinders and spheres. [03]
   2. (1) Gel coat resins contain a additive to prevent runs and sags from forming during application and cure. (2) Which basic materials are used to make a polyester resin? (3) Polyester resin with high chemical resistance are frequently made from (a)ethylene glycol (b)dipropylene glycol (c) bisphenol A (4) List the purposes of adding styrene during the manufacture of polyester resin. [04]
   3. Give advantages and limitations of FRP. [07]
2. 1. Define term composites. Explain role of fibers in composites. [03]

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   2. Explain role of matrix in composites. [04]
   3. List and explain about types of glass fibers according to their application and commercial forms of availability. [07]

      OR

   4. Draw and explain manufacturing process of glass fiber. [07]

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3. 1. Short note on: Natural fibers. [03]
   2. Write note on Gel coat. [04]
   3. Explain manufacturing process of carbon fibers with neat sketch(Using PAN as precursors) [07]

      OR

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4. 1. List the advantages of carbon fibers. [03]
   2. List causes and remedies of the following faults during FRP manufacturing : (1) Fish eyes or craters (2) blisters [04]
   3. Write a note on: GRP molds. [07]
5. 1. List factors influencing designing of FRP. [03]

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   2. Explain Dough or Bulk molding compound. [04]
   3. Explain Hand layup techniques with neat sketch. List advantages and disadvantages of it compare to other process. [07]

      OR

6. 1. List the different types of fibers arrangement in FRP. [03]

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   2. List the advantages of Resin Transfer Molding. [04]
   3. Explain filament winding process with neat sketch. [07]
7. 1. List different types of Glycols used in manufacturing of Polyester resin. [03]
   2. Explain role of Catalyst, inhibitors and accelerators for matrix material in FRP. [04]

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   3. Explain Vacuum bag and Pressure bag molding process in detail with neat sketch. [07]

      OR

8. 1. List the material preparation techniques for FRP. [03]
   2. List various types of commercially available unsaturated polyester resins. [04]

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   3. Explain Pultrusion process with neat sketch. [07]

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