Periyar University 2005 B.Sc Electronics - Question Paper

(For the candidates admitted from 2003-2004 onwards)
B.Sc. DEGREE EXAMINATION, OCTOBER/NOVEMBER 2005.
First Semester
Electronics
PHYSICS OF MATERIALS AND SEMICONDUCTOR
DEVICES
Time : 3 hours Maximum : 100 marks
PART A — (10 x two = 20 marks)
ans ALL ques.. All ques. carry equal marks.
1. What is ionic bond?
2. Define space lattice.
3. Define mean free path.
4. What is Drift Velocity?
5. What is an intrinsic semiconductor?

6. Define hall effect.
7. Define static and dynamic resistance of a diode.
8. Draw the PIN diode.
9. Name 3 thyristor devices.
10. Draw the equivalent circuit of an SCR.
PART B — (5 x four = 20 marks)
ans ALL ques..
All ques. carry equal marks.
11. (a) discuss about metallic bond.
Or (b) Write a short note on Bravais lattices.
12. (a) Write a note on phonons
Or (b) discuss the matheissen's rule.
13. (a) discuss the majority and minority carriers of
p kind semiconductor.
Or
(b) discuss the effect of temperature on semiconductors.
14. (a) discuss properties of pn junction diode.
Or
(b) discuss the working function of a Varactor diode.
15. (a) Write a short note on photo conductor.
Or (b) discuss the constructional details of SCR. PART C — (5 x 12 = 60 marks)
ans ALL ques.. All ques. carry equal marks.
16. (a) discuss about ionic and covalent bonds and
their characteristics.
Or
(b) discuss the powder method of X ray diffraction to determine the crystal structure.
17. (a) discuss the free electron theory.
Or
(b) discuss the electrical and thermal conductivity of a metal.
18. (a) With a neat diagram discuss in detail about
N kind semiconductor.
Or
(b) define the insulators, conductors and semiconductors using energy band diagram.
19. (a) Draw the forward bias and Reverse bias
connection of a Zener diode. discuss the
VI characteristics of the Zener diode.
Or
(b) With a neat diagram discuss the characteristics of UJT.
20. (a) discuss the VI characteristics of a SCR.
Or (b) discuss the function of CCD.

Earning:   Approval pending.