Anna University Polymers and Ceramics Model Test Paper
VI SEM – Polymers and Ceramics
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
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)