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UGC NET JUN 2008 : 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. J 8 8 0 8 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 J 8808 1 P.T.O. ELECTRONIC SCIENCE PAPER III NOTE : J 8808 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 f ive (5) q uestions based on the following paragraph. Each question should be answered in about thirty (30) words and each carries five (5) marks. (5x5=25 Marks) Even in a large scale digital system, such as a computer or a data-processing, control or digital-communication system, there are only a few basic operations which must be performed. These operations to be sure, may be repeated very many times. The four circuits most commonly employed in such a systems are known as the OR, AND, NOT, NOR etc. These are called logic gates or circuits, because they are used to implement Boolean algebraic equations. This algebra was invented by G. Boole in the middle of the nineteenth century as a system for the mathematical analysis of logic. 1. Define : (a) Positive logic (b) Negative logic J 8808 3 P.T.O. 2. Define an OR gate and give its truth table. 3. Define an AND gate and give its truth table. J 8808 4 4. State the two forms of De Morgan s Law. 5. Show how to implement an AND with OR and NOT gates. J 8808 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. Define the followings : (a) Cut-in voltage of a transistor. (b) Early effect J 8808 6 7. Describe the physical mechanism of Zener breakdown. Draw a circuit which uses Zener diode to regulate the voltage across a load. 8. State clearly the Thevenin s and Superposition theorems and explain their usefulness in linear network analysis. J 8808 7 P.T.O. 9. What do you mean by Multivibrator ? Classify different types of multivibrator. Explain the operation of bistable multivibrator. 10. What is Memory ? Describe different memory types used with microprocessor based system. J 8808 8 11. What is conditional operator in C ? When it can be used ? What do you mean by storage class in C ? 12. Define the characteristic impedance of a transmission line. When is the input impedance of a transmission line equal to its characteristic impedance ? Explain the meaning of the term Standing Wave Ratio . J 8808 9 P.T.O. 13. What is Multiplexing ? Discuss Time Division Multiplexing. 14. Explain critical angle, acceptance angle and numerical aperture for an optical fiber. J 8808 10 15. Write short notes on Logic State Analyser. 16. Describe the diffusion process. What do you mean by impurity profile ? J 8808 11 P.T.O. 17. What is signal generator ? How does it differs from an ordinary oscillator ? 18. Explain in detail the principle of operation and working of any A/D converter with the help of necessary diagram. J 8808 12 19. What do you understand by interrupt in 8085 microprocessor system ? Explain different steps to understand the execution of interrupt instructions. 20. Compare the laser diode and LED for use as light sources in optical communication system. J 8808 13 P.T.O. SECTION - III Note : This section contains f ive (5) q uestions. Each question carries twelve (12) marks and is to be answered in about two hundred (200) words. (12x5=60 Marks) 21. (a) Describe the various steps involve in photoetching process during IC fabrication. (b) State and prove Norton s theorem. (a) Classify different types of oscillators. (b) State and prove Barkhausen s criterion for oscillator. 22. 23. Explain the architecture of 8086 microprocessor. 24. Draw the block diagram of a PLL system and explain its ability to track the frequency changes in the input signal. What do you mean by Lock range and Capture range . 25. Explain the difference between open loop and closed loop control system. J 8808 14 J 8808 15 P.T.O. J 8808 16 J 8808 17 P.T.O. J 8808 18 J 8808 19 P.T.O. J 8808 20 J 8808 21 P.T.O. J 8808 22 J 8808 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. Draw the circuit of an OPAMP as an integrator and explain its operation. Draw the structure and refractive index profile for (i) step-index multidiode (ii) graded-index and (iii) single mode fibers Define the term flag and explain how each flag are executed with suitable examples. With a neat circuit diagram, explain the working of a crystal oscillator. Give its merits and demerits. OR Explain in detail the principle and working of D/A converter. A program has been compiled and linked successfully. When you run this program you face one or more of the following situations. (i) Program is executed but no output (ii) It produces incorrect answers (iii) It does not stop running What are the possible causes in each case and what steps would you take to correct them ? With a neat diagram, explain the working of cavity magnetron. Discuss Hall Effect in materials. Explain how this phenomena can be used to determine whether a semiconductor is n type or p type. (a) (b) (c) (d) (a) (b) (c) (d) J 8808 24 J 8808 25 P.T.O. J 8808 26 J 8808 27 P.T.O. J 8808 28 J 8808 29 P.T.O. J 8808 30 J 8808 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) J 8808 Date ............................. 32

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Additional Info : Ugc Net June 2008 Question Paper - Electronic Science Paper II
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