Anna University Polymers and Ceramics Model Test Paper

Anna University Polymers and Ceramics Model Test Paper

VI SEM –  Polymers and Ceramics

METALLURGICAL ENGINEERING

TIME – 3 Hours                                                                    MAX. Marks

PART – A                     (10 x 2 = 20 Marks)

ANSWER ALL QUESTIONS

1.Schematically show the structure of a co polymer.  Give an example for co polymer.

2.Give one example each for (i) amorphous and (ii) semi-crystalline polymers.

3.What type of polymerization is used for the production of (i) thermoplastics and  (ii) thermosets?

4.A polyethylene sample has a molecular weight of 1,00,000 g/g mole.  What is the degree of                                          polymerization?

5.Distinguish between the term polymer and plastics.

6.Define the term ceramics.  Give two examples.

7.Calculate the critical radius ratio for six fold coordination in ionic ceramics.

8.What are the characteristics required for ceramics used in nuclear applications?

9.List any two ceramic components made by (i) hot pressing and (ii) hot isostatic pressing.

10. What are glasses? How are they classified?                                                                                                                                                                                                                                                      PART – B                             5 x 16 = 80 Marks

 

11. a)  Discuss the different types of polymerization with examples.                   (8)

b)  Discuss how fine ceramics are classified.  Discuss their applications with

suitable examples.                                                                                             (8)

 

12. a. (i) Explain how polymers are classified? Give examples for each class   (8)

 

(ii) What are the different ways of expressing molecular weight of

polymers? Explain.                                                                                        (8)

( OR )

b. (i) Discuss the structure, properties and applications of

(i)       polyethylene      (ii) polyvinyl chloride

(iii)  polystyrene and  (iv) Teflon.                                                              (8)

(ii) Compare the yielding and fracture behavior of thermoplastics

and thermo set.                                                                                            (8)

13. a) (i) What is glass transition temperature in polymers?  Explain.

What are the factors that influence glass transition temperature?        (8)

 

(ii) Discuss the creep and stress relaxation phenomena in polymers

with examples.                                                                                                (8)

 

( OR )

b)  (i) Discuss briefly any two processes used for forming thermoplastics

with neat sketches.                                                                               (8)

 

(ii)  Discuss the various criteria to be considered in the selection of

polymers.                                                                                                      (8)

 

14.a) (i) Discuss briefly the following structures with neat sketches

(i) CsCl  (ii) Flourite       (iii) alumina                                                         (8)

 

(ii)   Calculate the coordination number and density of magnesia

from the following data :

radius of magnesium ion = 0.66 Ao

radius of oxygenion  = 1.32 Ao

the atomic weights are 24.3 g/g mole and 16 g/g mole for

magnesium and oxygen respectively.

MgO has NaCl structure                                                                  (8)

 

( OR )

b) (i) Discuss the important ceramics and their properties for use in

(i) magnetic and (ii) thermal functions.                                                   (8)

 

(ii) Briefly discuss  hot isostatic pressing process with a neat sketch

of the HIP unit.                                                                                              (8)

 

15. a) (i) Explain how slip casting of ceramics is done. What are the

parameters that affect slip casting process?                                              (8)

 

(ii) Discuss Pilkington process for float glass manufacture?                      (8)

 

( OR )

b) (i) Discuss the structure, properties and applications of glasses.              (8)

 

(ii)Discuss briefly (i) blowing and (ii) pressing processes used

for forming glass articles.                                                                   (8)

 

Leave a Comment