Mahatma Gandhi University B.Tech Polymer Engineering and Technology polymer engineering branch. Question paper 2014

University:  Mahatma Gandhi University
Course: B.Tech
Subject : polymer engineering branch
Year of  Question Paper : 2014


VIII Sem. B. Tech. Polymer Engineering Degree Examination
Mahatma Gandhi University
PO 010 804 L 01: Adhesive Technology
Time: 3Hours                                                                                                                           
Marks:100

Part A
(Answer all questions)
(Each question carries 3 marks)

1. Explain the thermodynamic concept of wettability  in adhesives
2. With an example define primer
3. Define hot melt adhesives.  What are the advantages and limitations?
4. Define structural adhesives with examples
5. Mention the different types of adhesive joints  
(3x5 =15)

Part B
(Answer all questions)
(Each question carries 5 marks)

6. Differentiate between adhesive failure and cohesive failure of the adhesive
7. Differentiate between high energy and low energy surfaces
8. Define pressure sensitive adhesives
9. Briefly mention on the use of adhesives in electrical industry
10. Mention the general principles followed in the design of adhesive bonds for optimum bond
strength
(5x5 =25)

Part C
(Answer either a OR b)  
(Each question carries 12 marks)

11(a) What are the advantages and disadvantages of adhesive bonding over other
conventional      
         methods of joining
OR
            (b)   Write notes on:
                  (i) Work of adhesion    (ii) Rheology of adhesion
                  (iii) Effect of Tg on adhesion
            12(a) Discuss the various surface preparation techniques prior to adhesive bonding     
OR
                     (b) Discuss on the various theories of adhesion  
       13 (a) Write notes on:
                   (i) classification of adhesives based on the method of cure  
                   (ii) Natural adhesives      
OR
                (b) Write notes on:  
                (i) cyanoacrylate adhesive (ii) anaerobic adhesives
                (iii) polyvinyl acetate adhesives
       14(a) (i) Formulate an epoxy resin adhesive with the function of each ingredient      
                 (ii) use of adhesives in automobile industry
OR
              (b) What are structural adhesives? Discuss the preparation, properties and   
                  applications of phenolic resin adhesives  
    15(a) (i) What are the standard test methods for determining the strength of adhesive joints?
              (ii) what precautions should be taken for maximum effectiveness of adhesive bonds
(8+4)
OR
          (b) Compare the different joint geometries in adhesive bonds
            
(12x5 =60)..

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