Friday, May 29, 2015

BE CSE 5ET221/6C0024 (2006/07/08/09) Electronic Devices & Circuits Sathyabama University December 2010

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act, 1956)

Course & Branch: B.E/B.Tech - CSE/IT

Title of the Paper: Electronic Devices & Circuits Max. Marks: 80

Sub. Code: 5ET221/6C0024 (2006/07/08/09) Time: 3 Hours

Date: 08/12/2010 Session: AN

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PART - A (10 X 2 = 20)

Answer ALL the Questions

1. Define drift and diffusion.

2. What are the applications of a Photo diode?

3. Compare MOSFET and JFET.

4. What are the regions in which a transistor operates?

5. What is a load line of an amplifier?

6. What is a tuned amplifier, list its types.

7. What is a Colpitts Oscillator? Give its applications.

8. What are the merits and demerits of negative feedback?

9. List the applications of Operational Amplifier.

10. List the applications of a 555 timer IC.

PART – B (5 x 12 = 60)

Answer All the Questions

11. Explain the Transition Capacitance of a PN junction diode? Derive the expression for the same.

(or)

12. Write short notes on

(a) Tunnel Diode

(b) Photo Transistor

13. Convert a transistor in Common Emitter configuration to its hybrid model. Give the expressions of current gain, voltage gain, input and output impedances.

(or)

14. Explain in detail the construction and working of a N-Channel Mos FET in enhancement and depletion mode.

15. What is the need for biasing a BJT? Discuss in detail on various circuits used for biasing BJT.

(or)

16. Explain the working of a class A power amplifier. Derive an expression for its efficiency.

17. Classify the feedback amplifiers and explain the working of any two types with neat diagrams.

(or)

18. Draw the circuit of a transistorized RC phase shift oscillator and explain its working. Derive the expression for its frequency of oscillation.

19. Discuss the application of a Op-amp as a

(a) Subtractor

(b) Comparator

(or)

20. Draw the circuit of a mono-stable multivibrator using IC 555 and explain its working. Give its applications.

Duraimani

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