Wednesday, November 4, 2009
| B.E./B.Tech. DEGREE EXAMINATION, May/June 2007 |
| Annual Pattern First Year |
| (Regulation 2004) |
| Computer Science and Engineering |
| EC 1X11- ELECTRONIC DEVICES AND CIRCUITS |
| (Common to Information Technology ) |
| Time:Three hours Maximum:100 marks |
| Answer all questions |
| (PART A-10*2=20 marks) |
| !.What is intrinsic semiconductor? Give two examples. |
| 2.What is meant by zener breakdown? |
| 3.What are the biasing conditions to operate a transistor in active region? |
| 4.What is thermal runaway? |
| 5.List the merits and demerits of negative feedback. |
| 6.Write the Barkhausen criterion condition for oscillator. |
| 7.Draw the VI characteristics of DIAC. |
| 8.What is an opto-isolator. |
| 9.What is meant by precision rectifier? |
| 10.Mention the ideal characteristics of op-amp. |
| (PART B-5*16=80 marks) |
| 11.(a).Discuss the VI characteristics of P-N diode and zener Diode with their |
| construction and principle of operation. |
| Or |
| (b).(i).Explain the operation of full wave rectifier with necessar y wave forms. |
| (ii).With suitable circuit diagram, explain the operation of positive clipper, negative |
| clipper, positive clamper and negative clamper. |
| 12.(a).Discuss the VI characteristics of any two types of MOSFET. |
| Or |
| (b).Determine the operating points of the following circuit. Also find the stability |
| factor if ß value of the silicon transistor is 50. |
| 13.(a).Design a negative feed back amplifier with a feed back factor of 10%. Also |
| find the number of stages required to get a gain of 100 with feed back. Assume the |
| non feed back amplifier has a gain of 1000. |
| Or |
| (b).Write short notes on the following: |
| (i).Colpitts oscillator. |
| (ii).Bistable multivibrator |
| 14.(a).Explain the VI characteristics of SCR and TRIAC. |
| Or |
| (b).Discuss the operation of LCD and solar cell in detail. |
| 15.(a).With operational amplifier, explain the operation of Wein bridge oscillator and |
| low pass filter. |
| Or |
| (b).Explain the applications of op-amp with respect to the following: |
| (i).Non inverting amplifier |
| (ii).Integrator |
| (iii).Differentiator |
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