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UGC NET DEC 2007 : ELECTRONIC SCIENCE PAPER III

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Signature and Name of Invigilator Roll No. (In figures as per admission card) 1. (Signature) (Name) Roll No. 2. (Signature) (Name) Test Booklet No. D 8 8 0 7 Time : 2 hours] (In words) PAPER III ELECTRONIC SCIENCE Number of Pages in this Booklet : 32 [Maximum Marks : 200 Number of Questions in this Booklet : 26 Instructions for the Candidates U U 1. Write your roll number in the space provided on the top of this page. 1. U DU U S U U U U U 2. U U U, U S U U 2. Answers to short answer/essay type questions are to be given in the space provided below each question or after the questions in the Test Booklet itself. U U No Additional Sheets are to be used. 3. U U U, - S U U U - S U U 3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below : (i) - S U U U U U U U S U U- U S S U U (i) To have access to the Test Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet. (ii) U DU U U U - S DU U U U U U U S DU / U U U U U S S U U U U U S U U - S U U - S U UQ (ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the question booklet will be replaced nor any extra time will be given. 4. U U 4. Read instructions given inside carefully. 5. One page is attached for Rough Work at the end of the booklet before the Evaluation Sheet. 5. U U- S (Rough Work) U U DU 6. If you write your name or put any mark on any part of the Answer Sheet, except for the space allotted for the relevant entries, which may disclose your identity, you will render yourself liable to disqualification. 6. U- S U , U U U U 7. U # U U- S U U U U U # U U U U 7. You have to return the Test booklet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. 8. / U Z U S U 8. Use only Blue/Black Ball point pen. 9. Use of any calculator or log table etc. is prohibited. 9. U ( U U) U U 10. There is NO negative marking. 10. U U D 8807 1 P.T.O. ELECTRONIC SCIENCE PAPER III NOTE : D 8807 This paper is of two hundred (200) marks containing four (4) sections. Candidates are required to attempt the questions contained in these sections according to the detailed instructions given therein. 2 SECTION - I Note : This section contains five (5) questions based on the following paragraph. Each question should be answered in about thirty (30) words and each carries five (5) marks. (5x5=25 marks) Integrated circuits are classified as either linear or digital, referring to the two broad categories of applications for which they may be designed. Linear integrated circuits are those whose components are operated in the linear or active regions of their characteristics such as amplifiers. These circuits are said to be analog or continuous in nature, because voltages and currents can vary through a continuous range of possible values. Applications include audio and high-frequency amplifiers, operational amplifiers, modulators, oscillators, voltage regulators and power amplifiers. Digital integrated circuits are those whose components are used in logic and switching circuits. The devices in digital ICs are operated so that they switch rapidly between only two possible outputs, typically saturation and cut-off. They are used in computer logic circuitry, computer memories, and digital communication systems. 1. List out different steps for fabrication of integrated circuits. D 8807 3 P.T.O. 2. Mention characteristics of analog ICs. 3. Explain the operating principle of any LSI digital IC logic family. D 8807 4 4. Define propagation delay and fan-out of digital logic system. 5. Define the characteristics of ideal operational amplifier. D 8807 5 P.T.O. SECTION - II Note : This section contains fifteen (15) questions each to be answered in about thirty (30) words. Each question carries five (5) marks. (5x15=75 marks) 6. Draw the bridge rectifier circuit and define the term ripple factor . D 8807 6 7. Describe the process of epitaxial growth. 8. What are the advantages and disadvantages of frequency response analysis ? D 8807 7 P.T.O. 9. State and prove the Superposition theorem. 10. Discuss the superiority of FETs over BJTs. D 8807 8 11. Discuss the advantage of object oriented programming in C. 12. Draw the equivalent circuit and explain the working principle of SCR. D 8807 9 P.T.O. 13. What is meant by interrupt ? What are its types with respect to 8085 microprocessor. 14. What are the advantages of PPM over PAM ? D 8807 10 15. Explain the function of Gunn diode. 16. With the help of schematic diagram, describe the working principle of Magnetron. D 8807 11 P.T.O. 17. Define directivity and effective area of an antenna. Draw the radiation pattern of a half-wave dipole antenna. 18. In what way is the graded-index fiber better than the multimode step-index fiber ? Define the normalized frequency for an optical fiber and explain its use in the determination of number of guided modes propagating within a step-index fiber. D 8807 12 19. Draw the circuit diagram using OPAMP as an integrator. 20. Discuss open-loop and close-loop control system. D 8807 13 P.T.O. SECTION - III Note : This section contains five (5) questions. Each question carries twelve (12) marks and is to be answered in about two hundred (200) words. (12x5=60 marks) 21. Explain pinch-off effect for JFET. Write an equation relating VGS to VP for a JFET. 22. What do you mean by Phase Lock Loop (PLL) ? Explain free running frequency, capture range and locking range. 23. (a) Use an op-amp to be connected as (i) (ii) (b) Differentiating circuit Summer Define the following : (i) CMRR (ii) Bandwidth (iii) Open-Loop and closed loop gain of op-amp 24. Describe the step by step procedure to draw Bode plot ? 25. What do you mean by spontaneous emission and stimulated emission ? Why LASER shows high degree of coherence ? D 8807 14 D 8807 15 P.T.O. D 8807 16 D 8807 17 P.T.O. D 8807 18 D 8807 19 P.T.O. D 8807 20 D 8807 21 P.T.O. D 8807 22 D 8807 23 P.T.O. SECTION - IV Note : This section consists of one essay type question of forty (40) marks to be answered in about one thousand (1000) words on any of the following topics. (40x1=40 marks) 26. (a) Explain zener diode and draw its I - V characteristics. (b) Draw the necessary diagram and explain the functioning of Maximum Power Transfer theorem. (c) Explain in detail the working of band pass filter. (d) What do you mean by multivibrator ? With a neat diagram, explain the operation principle of bistable multivibrator. OR (a) Explain the principle of PIN photodiode and how it is used as an optical detector in fiber optic communication. (b) With a neat diagram, explain the operation of C.R.O. Give three applications. (c) Draw the architecture of 8085 microprocessor and explain its working. (d) Discuss the operation of PID controller. D 8807 24 D 8807 25 P.T.O. D 8807 26 D 8807 27 P.T.O. D 8807 28 D 8807 29 P.T.O. D 8807 30 D 8807 31 P.T.O. FOR OFFICE USE ONLY 1 26 51 76 2 27 52 77 3 28 53 78 4 29 54 79 5 30 55 80 6 31 56 81 7 32 57 82 8 33 58 83 9 34 59 84 10 35 60 85 11 36 61 86 12 37 62 87 13 38 63 88 14 39 64 89 15 40 65 90 16 41 66 91 17 42 67 92 18 43 68 93 19 44 69 94 20 45 70 95 21 46 71 96 22 47 72 97 23 48 73 98 24 49 74 99 25 50 75 Marks Obtained Question Number Marks Obtained Question Number Marks Obtained Question Number Marks Obtained Question Number Marks Obtained 100 Total Marks Obtained (in words) ..................................... (in figures) .................................... Signature & Name of the Coordinator ............................... (Evaluation) D 8807 Date ............................. 32

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Additional Info : Ugc Net December 2007 Question Paper - Electronic Science Paper III
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