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Material Science 2 Question Paper

Material Science 2

Course:Electrical And Electronics Engineering

Institution: Technical University Of Mombasa question papers

Exam Year:2016

CONDUCTOR MATERIALS
1. Explain factors that affect conductivity.
2. State FIVE common conducting materials.
3. Outline the factors required to select materials for:-
(i) Electrical resistance alloys
(ii) Fuse metals
(iii) Contact metals
4. Mention advantages of using carbon and graphite as conductors.
5. What are semiconductors?
6. Explain
(i) Superionic conductors.
(ii) Super conductivity
7. Mention advantages of GaAs semiconductors which are doped
8. What is magnetostriction.
9. Mention 5 magnetic materials.
10. Explain:-
(i) Paramagnetism
(ii) Antiferromagnetism
(iii) Ferrimagnetism
(iv) Ferromagnetic
11. Sketch a graph of magnetization vs temperature and show how the currie point is determined.
12. How is relative permeability determined?

MAGNETIC MATERIALS.
1. Describe the hysteresis curve of a magnetic material.
2. Explain the cause of magnetism in materials.
3. Define:-
(i) Curie temperature
(ii) Coercive force
(iii) Remanence
4. Distinguish:-
(i) Piezoelectrics
(ii) Pyroelectrics
(iii) Ferroelectrics
5. Explain why ferroelectrics are suitable for applications such as:-
(i) DRUM storage
(ii) Microactuators
(iii) Memory cells
(iv) Infra-red switch/sensor.
PCB
1. Describe a method of generating an artwork for each layer of the board.
2. Explain the function of the photo resist.
3. Briefly outline the steps of making a circuit board.
4. Mention 2 types of etchants.
5. For what reason is tin plating applied on a circuit board.
6. How are holes made on the board?
ETCHING
1. Distinguish wet and dry etching
2. Explain the mechanism of etching
3. What factors determine etch rate.
DIELECTRICS
1. Mention 4 examples of dielectrics
2. How is dielectric strength measured?
3. Explain forms of plastic insulating materials.
4. Why is wood not used commonly as an electrical insulating material?
ENCAPSULANTS
1. Explain the functions of encapsulants.
2. Provide 3 examples of encapsulants.
FERROELECTRICS
1. Give the characteristics of ferroelectrics
2. Mention 3 examples of ferroelectric materials
3. State 4 applications of ferroelectrics
4. Explain the purpose of ferroelectrics and highlight their advantages.
5. Show a diagram explaining the temparature dependence of a typical ferroelectric ceramics.
ADHESIVES MATERIALS
1. Explain the purpose of adhesives.
2. List 3 types of adhesives.
3. Outline the different desired properties of adhesives.
4. Why is the use of lead- base solder alloys discouraged in adhesives?
5. How do we prepare a surface for adhesive?
6. State 4 mechanisms of adhesive.
7. Mention 4 applications of electrically conducting adhesives.

Material Science 2 Question Paper

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