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UGC NET paper-3 (Electronic Science)June-2010

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Signature and Name of Invigilator Roll No. 1. (Signature) __________________________ (Name) ____________________________ 2. (Signature) __________________________ (Name) ____________________________ J 88 Time : 2 1/2 hours] Roll No.____________________________ (In words) Test Booklet No. 1 0 PAPER-III ELECTRONIC SCIENCE Number of Pages in this Booklet : 24 Instructions for the Candidates 1. Write your roll number in the space provided on the top of this page. 2. Answer 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. No Additional Sheets are to be used. 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) To have access to the Question 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) 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. Read instructions given inside carefully. 5. One page is attached for Rough Work at the end of the booklet before the Evaluation Sheet. 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. 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. Use only Blue/Black Ball point pen. 9. Use of any calculator or log table etc., is prohibited. J-8810 (In figures as per admission card) [Maximum Marks : 200 Number of Questions in this Booklet : 26 1. 2. , 3. , - - : (i) - - (ii) - / - - 4. 5. - (Rough Work) 6. - , 7. - 8. / 9. ( ) P.T.O. ELECTRONIC SCIENCE PAPER III Note : 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. J-8810 2 SECTION I Note : This section consists of two essay type questions of twenty (20) marks each, to be answered in about five hundred (500) words each. 1. (2 20 = 40 marks) Discuss how the design is transferred from the initial art work to the final design on a silicon wafer using photolithography technique. OR Write an essay on combinational logic. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 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Explain the applications of OPAMP as (i) adder, (ii) integrator, (iii) differentiator & (iv) Schmitt trigger. OR What are different methods to control speed of a dc motor ? Explain any one technique in detail. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ J-8810 6 _______________________________________________________________________________________________ _______________________________________________________________________________________________ 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_______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ SECTION II Note : This section contains three (3) questions of fifteen (15) marks each to be answered in about three hundred (300) words. 3. (3 15 = 45 marks) Explain with suitable diagram demultiplexing of AD0 AD7 and formation of Address, data and control buses for 8085. 4. (a) Calculate all the currents through the resistances and delivered by voltage source of the following circuit. (10) (b) Determine the Laplace Transform of following function F(s) = 5. J-8810 s (s + 2) (s + 1) (5) Derive the value of numerical aperture and acceptance angle in a fiber optic communition system. Discuss how the data rate increases with the change in the value of numerical aperture ? 10 _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 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_______________________________________________________________________________________________ J-8810 16 SECTION III Note : This section contains nine (9) questions of ten (10) marks, each to be answered in about fifty (50) words. (9 10 = 90 marks) 6. The equivalent circuit of tunnel diode is shown below : Calculate its input impedance. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 7. Define tree, cotree, nodes, loops and incidence matrix w.r.to the graph theory. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ J-8810 17 P.T.O. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 8. Draw the structure of MOSFET and explain the threshold voltage for enhancement mode and depletion mode MOSFET by drawing the transfer characteristics. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 9. How NAND gate works as a universal gate ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ J-8810 18 10. What is the difference between post-increment and pre-increment operations ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 11. Define gain and radiant frequency of an antenna. Give one property of isotropic antenna. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ J-8810 19 P.T.O. 12. Explain the function of physical layer in data communication system. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 13. What do you mean by coherence ? Why LASER exhibits high degree of coherence ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ J-8810 20 14. What is the significance of hysteresis in ON-OFF controller ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ SECTION IV Note : This section contains five (5) questions of five (5) marks each based on the following passage. Each question should be answered in about thirty (30) words. (5 5 = 25 marks) There are several conventional vacuum tubes and microwave tubes in common use. The conventional vacuum tubes such as triodes, tetrodes and pentodes are still used as signal source of low output power at low microwave frequencies. The most important microwave tubes at present one two kavity klystron and reflex klystrons. The advent of klystron amplifier began in 1939. The two cavity klystron is widely used as microwave amplifier operated by principle of velocity and current modulation. All electrons injected from cathode arrive at the first cavity with uniform velocity and then pass through the second cavity. As a result of these actions the electrons gradually bunched together as they travel down the drift space. In 1957, the first solid state microwave devices was invented in 1957 and is called the tunnel diodes. Tunnel diode is useful in microwave oscillators and amplifiers. It exhibits a negative resistance characteristics in the region between peak current and valley current. J-8810 21 P.T.O. 15. What is velocity modulation ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 16. What is current modulation ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 17. Discuss briefly the bunching process. How does it take place ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ J-8810 22 _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 18. Draw the current-voltage characteristics of tunnel diode and mark the tunnelling current. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 19. Explain the operation of tunnel diode. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ ____________ J-8810 23 P.T.O. FOR OFFICE USE ONLY Marks Obtained Marks Obtained Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Total Marks Obtained (in words) ........................................... (in figures) .......................................... Signature & Name of the Coordinator ................................... (Evaluation) J-8810 Date ......................... 24

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