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Posted By: Jagadeesan. D Member Level: Silver Posted Date: 17 Dec 2007
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2007 Anna University B.E Electrical and Electronics EC 1211 – Electronic Devices - May / June – 2007 Question paper
B.E. / B.Tech. Degree Examination, May / June – 2007
Third Semester
Electrical and Electronics Engineering
EC 1211 – Electronic Devices
PART – A (10 X 2 =20 marks)
1. Give the diode current equation.
2. Define cutin voltage.
3. Give the current gain expression for a common emitter transistor configuration.
4. What are the tools used for small signal analysis of BJT?
5. Differentiate between BJT and JFET’s.
6. Give any two application of UJT.
7. Give any two application of liquid crystal cells.
8. What is the difference between LED’s and Photo diodes?
9. Why are zener diodes employed as voltage regulations?
10. What is the significance of a varactor diode?
PART –B ( 5 X 16 = 80 marks)
11. (a) Explain the working of a PN junction diode under various biasing conditions using the relevant circuit sketch.
Or
(b) (i) Explain how a PN junction is formed? ( Marks – 8)
(ii) Write a note on diode capacitors. ( Marks – 8)
12. (a) Explain the input and output characteristics of a common base BJT configuration. Also draw the characteristics curves.
Or
(b) Using the hybrid equivalent model, analyse and deduce the expression for the parameters using the circuit sketch. What is the significance of this approach?
13. (a) Explain the construction, working and operating characteristics of N-Channel JFET’s with relevant diagrams. Give the application of JFET’s.
Or
(b) Explain the construction and working of the unijunction transistor. What is the significance of the operating VI characteristics of UJT. Draw the relevant diagrams.
14. (a) Write a detailed note on :
(i) LED’s ( Marks – 8)
(ii) Phototransistor. ( Marks – 8)
Or
(b) Explain the construction, working and VI characteristics of a Phototransistor. Bring out the difference between phototransistor and photodiodes.
15. (a) Give the theory of construction, working and VI characteristics of SCR. List out the applications of it.
Or
(b) Discuss about the construction, working and operating characteristics of a tunnel diodes. What is the salient feature of this diode?
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