UGC 2009 Electronic Science Paper-3

1. ¯ÖÆü»Öê ¯ÖéÂü êú ú¯Ö¸ü ×­ÖµÖÖ Ã£ÖÖ­Ö ¯Ö¸ü ¯Ö­ÖÖ ¸üÖê»Ö ­Ö´²Ö¸ü ×»Ö×Ö 2. »ÖÖã ¯ÖÏ¿­Ö Ö£ÖÖ ×­Ö²ÖÓ¬Ö ¯ÖÏúÖ¸ü êú ¯ÖÏ¿­ÖÖë êú ¢Ö¸ü, ¯ÖϵÖêú ¯ÖÏ¿­Ö êú ­ÖßÖê µÖÖ ¯ÖÏ¿­ÖÖë êú ²ÖÖ¤ü ´Öë פüµÖê Æãü ׸üÖ Ã£ÖÖ­Ö ¯Ö¸ü Æüß ×»Ö×ÖµÖê ÃÖêú ×»Ö úÖêÔ ×Ö׸üÖ úÖÖÖ úÖ ¯ÖµÖÖêÖ ­ÖÆüà ú¸ü­ÖÖ Æîü 3. ¯Ö¸üßÖÖ ¯ÖÏÖ¸ü´³Ö ÆüÖê­Öê ¯Ö¸ü, ¯ÖÏ¿­Ö-¯ÖãÛÃÖúÖ Ö¯ÖúÖê ¤êü ¤üß ÖÖµÖêÖß ¯ÖÆü»Öê ¯ÖÖÑÖ ×´Ö­Öü Ö¯ÖúÖê ¯ÖÏ¿­Ö-¯ÖãÛÃÖúÖ ÖÖê»Ö­Öê Ö£ÖÖ ÃÖúß ×­Ö´­Ö×»Ö×ÖÖ ÖÖÑÖ êú ×»Ö ×¤üµÖê ÖÖµÖëÖê ×ÖÃÖúß ÖÖÑÖ Ö¯ÖúÖê ¾Ö¿µÖ ú¸ü­Öß Æîü : (i) ¯ÖÏ¿­Ö-¯ÖãÛÃÖúÖ ÖÖê»Ö­Öê êú ×»Ö ÃÖêú ú¾Ö¸ü ¯ÖêÖ ¯Ö¸ü »ÖÖß úÖÖÖ úß ÃÖᯙ úÖê ±úÖÍü »Öë Öã»Öß ÆãüÔ µÖÖ ×²Ö­ÖÖ Ãüßú¸ü-ÃÖᯙ úß ¯ÖãÛÃÖúÖ Ã¾ÖßúÖ¸ü ­Ö ú¸ëü (ii) ú¾Ö¸ü ¯ÖéÂü ¯Ö¸ü û¯Öê ×­Ö¤ìü¿ÖÖ­ÖãÃÖÖ¸ü ¯ÖÏ¿­Ö-¯ÖãÛÃÖúÖ êú ¯ÖéÂü Ö£ÖÖ ¯ÖÏ¿­ÖÖë úß ÃÖÓµÖÖ úÖê ûß Ö¸üÆü Öîú ú¸ü »Öë ×ú µÖê ¯Öæ¸êü Æïü ¤üÖêÂÖ¯ÖæÖÔ ¯ÖãÛÃÖúÖ ×Ö­Ö´Öë ¯ÖéÂü/¯ÖÏ¿­Ö ú´Ö ÆüÖë µÖÖ ¤ãü²ÖÖ¸üÖ Ö ÖµÖê ÆüÖë µÖÖ ÃÖß׸üµÖ»Ö ´Öë ­Ö ÆüÖë £ÖÖÔÖ ×úÃÖß ³Öß ¯ÖÏúÖ¸ü úß ¡Öã×ü¯ÖæÖÔ ¯ÖãÛÃÖúÖ Ã¾ÖßúÖ¸ü ­Ö ú¸ëü Ö£ÖÖ ÃÖß ÃÖ´ÖµÖ ÃÖê »ÖÖîüÖú¸ü ÃÖêú ãÖÖ­Ö ¯Ö¸ü ¤æüÃÖ¸üß ÃÖÆüß ¯ÖÏ¿­Ö-¯ÖãÛÃÖúÖ »Öê »Öë ÃÖêú ×»Ö Ö¯ÖúÖê ¯ÖÖÑÖ ×´Ö­Öü פüµÖê ÖÖµÖëÖê ÃÖêú ²ÖÖ¤ü ­Ö ÖÖê Ö¯Öúß ¯ÖÏ¿­Ö-¯ÖãÛÃÖúÖ ¾ÖÖ¯ÖÃÖ »Öß ÖÖµÖêÖß Öî¸ü ­Ö Æüß Ö¯ÖúÖê ×Ö׸üÖ ÃÖ´ÖµÖ ×¤üµÖÖ ÖÖµÖêÖÖ 4. ­¤ü¸ü פüµÖê ÖµÖê ×­Ö¤ìü¿ÖÖë úÖê ¬µÖÖ­Ö¯Öæ¾ÖÔú ¯ÖÍëü 5. ¢Ö¸ü-¯ÖãÛÃÖúÖ úêú ­Ö ´Öë úÖÖ úÖ´Ö (Rough Work) ú¸ü­Öê êú ×»Ö´Ö滵ÖÖÓú­Ö ¿Ößü ÃÖê ¯ÖÆü»Öê ú ¯ÖéÂü פüµÖÖ ÆãüÖ Æîü 6. µÖפü Ö¯Ö ¢Ö¸ü-¯ÖãÛÃÖúÖ ¯Ö¸ü ¯Ö­ÖÖ ­ÖÖ´Ö µÖÖ êÃÖÖ úÖêÔ ³Öß ×­Ö¿ÖÖ­Ö ×ÖÃÖÃÖê Ö¯Öúß ¯ÖÆüÖÖ­Ö ÆüÖê ÃÖêú, ×úÃÖß ³Öß ³ÖÖÖ ¯Ö¸ü ¤ü¿ÖÖÔÖê µÖÖ Ó×úÖ ú¸üÖê Æïü ÖÖê ¯Ö¸üßÖÖ êú ×»ÖµÖê µÖÖêµÖ ÖÖê×ÂÖÖ ú¸ü פüµÖê ÖÖµÖëÖê 7. Ö¯ÖúÖê ¯Ö¸üßÖÖ ÃÖ´ÖÖ¯Ö ÆüÖê­Öê ¯Ö¸ü ¢Ö¸ü-¯ÖãÛÃÖúÖ ×­Ö¸üßÖú ´ÖÆüÖê¤üµÖ úÖê »ÖÖîüÖ­ÖÖ Ö¾Ö¿µÖú Æîü Öî¸ü ÃÖê ¯Ö¸üßÖÖ ÃÖ´ÖÖÛ¯Ö êú ²ÖÖ¤ü ¯Ö­Öê ÃÖÖ£Ö ¯Ö¸üßÖÖ ³Ö¾Ö­Ö ÃÖê ²ÖÖÆü¸ü ­Ö »Öêú¸ü ÖÖµÖë 8. êú¾Ö»Ö ­Öß»Öê/úÖ»Öê ²ÖÖ»Ö ¯¾ÖÖÕü ¯Öî­Ö úÖ Æüß ÃÖê´ÖÖ»Ö ú¸ëü 9. ×úÃÖß ³Öß ¯ÖÏúÖ¸ü úÖ ÃÖÓÖÖú (îú»Öãú»Öêü¸ü) µÖÖ »ÖÖÖ êü²Ö»Ö Öפü úÖ ¯ÖϵÖÖêÖ ¾ÖÙÖÖ Æîü 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. D-8809 P.T.O. Signature and Name of Invigilator Roll No. (In words) 1. (Signature) __________________________ (Name) ____________________________ 2. (Signature) __________________________ (Name) ____________________________ Roll No.____________________________ D-8809 PAPER-IIITest Booklet No. [Maximum Marks : 200 Time : 2 1/2 hours] Number of Pages in this Booklet : 32 Number of Questions in this Booklet : 26 Instructions for the Candidates ¯Ö¸üßÖÖÙ£ÖµÖÖë êú ×»Ö ×­Ö¤ìü¿Ö (In figures as per admission card) ELECTRONIC SCIENCED-8809 2 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. D-8809 3 P.T.O. 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 carries five (5) marks. (5 × 25 = 25 marks) Transducers are energy converters. They are classified as passive and active. The transducers can be electrical or mechanical. However, electrical transducers are preferred since signal conditioning becomes easier. The important parameters for the selection of a transducer are linearity, sensitivity, range repeatability size etc. The transduction involves the principle of resistance, Inductance, Capacitance, photoemission, photo-resistance, thermo-electricity and so on. Some examples of transducers are LVDT, strain gauge, RTD, Bourdon tube, thermistors, photo-diode. The parameters measured with transducers are temperature, pressure, level, flow, force and position etc. At the input of any Data Acquisition System transducers are necessary. 1. What is a transducer ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 4 2. What is the advantage of using electrical transducers ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 3. Which transducers are used to measure pressure ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 5 P.T.O. 4. Define the term linearity. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 5. What is the range of K-type and J-type thermocouples ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 6 SECTION – II Note : This section contains fifteen (15) questions, each to be answered in about thirty (30) words. Each question carries five (5) marks. (5 × 15 = 75 marks) 6. How does the junction capacitance vary with reverse voltage in a p-n junction diode ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 7 P.T.O. 7. Write the steps involved in fabrication of MOSFET devices. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 8. What is the concept of duality ? Write the duality for at least 5 electrical quantities. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 8 9. What are h parameters ? State their importance. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 10. What is the difference between x ++ and ++ x ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 9 P.T.O. 11. What data types the bitwise operators can and cannot operate on ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 12. What is Poynting Vector ? 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Write Maxwell’s equation in integral and differential forms. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 14. What is the principle of super heterodyne receivers ? Why it is preferred ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 11 P.T.O. 15. Compare ASK, FSK and PSK. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 16. State applications of Choppers. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 12 17. Explain the meaning of 312 digit in multimeters. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 18. What are different methods of Blood Pressure measurements ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 13 P.T.O. 19. Explain the importance of derivative term in PID Controllers. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 20. State the Nyquist Criterion. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 14 SECTION – III Note : This section contains five (5) questions of twelve (12) marks each. Each question is to be answered in about two hundred (200) words. (12 × 5 = 60 marks) 21. Compare JFET with MOSFET. Draw I-V characteristics of depletion layer MOSFET and explain the different parameters of MOSFET. What is the basic difference between Depletion and Enhancement type MOSFETs ? 22. What is Modulus of a Counter ? Give design Mod-5 synchronous counter. Draw the required timing diagrams. 23. (a) Write a program in ‘C’/C ++/FORTRAN, which implements On-off control or proportional control. (b) Write a program to swap the values stored in two variables. 24. (a) How bunching is formed in Klystron ? Explain. (b) What are the applications of Smith chart ? 25. (a) Draw the functional block diagram of CRO and explain the function of sweep generator. What is importance of compensated probes ? (b) How phase measurements can be carried out with CRO ? _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 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_______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ D-8809 24 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 one of the following topics. (1 × 40 = 40 marks) 26. (a) Explain the difference between Zener and Avalanche breakdown mechanisms. Draw I-V characteristics of a Zener diode and explain its parameters. (b) What is Hall effect ? And derive the expression for Hall Voltage. (c) What is a semiconductor diode laser ? Describe its structure and explain its working. (d) Explain the working principle of Electron microscope along with its diagram. OR (a) What is interfacing ? How is the incompatibility due to the following are removed by interfacing (i) voltage other than TTL ? (ii) currents in excess of driving capacity of the bus ? (iii) capacitive load greater than 100 pF ? (b) Draw the circuit of a Schmitt Trigger and explain its working with suitable waveforms. (c) What are various digital modulation techniques ? Explain any one. (d) Draw the structure of a stepper motor and explain its working principle along with its industrial applications. _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ 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(in figures) .......................................... Signature & Name of the Coordinator ................................... (Evaluation) Date ......................... D-8809 32 Marks Obtained