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1997 Course Modern Electronic Systems

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Total No. of Questions :10] [Total No. of Pages : 2 P1622 [3764]-1047 B.E. (Electronics) MODERN ELECTRONIC SYSTEMS (404208) (1997 Course) Time :3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Assume suitable data, if necessary. SECTION - I Q1) a) With the help of neat diagram, explain absorption, stimulated emission, and spontaneous emission of an electron. [8] b) Explain population inversion and thresold condition of gain to start LASER. [8] Q2) a) With the help of energy level diagram, explain working of Nd : YAG LASER. [10] b) State typical applications of Nd : YAG LASER. [6] Q3) a) Draw diagram and explain how Load Cell can be used for vibration measurement. [8] b) Draw and explain different controls on a vibration analyzer. State specifications. [8] Q4) a) What is meaning of Air pollution index? How this index indicates different pollutants in the air? [8] b) How sound pollution is expressed and measured? State maximum allowable sound pollution levels in different areas in the city. [8] P.T.O. Q5) Write short notes on any three. [18] a) Semiconductor Laser. b) Holography. c) Water pollution measurement. d) Sound level meter. e) GPS system. SECTION - II Q6) a) b) Q7) a) Explain a security system with sensors for a bank. [8] Explain working of a Gas sensor in fire alarm system. [8] Draw block diagram and explain solar powered street lamp. [8] b) What is meant by AH capacity of an battery Calculate AH capacity of an battery to operate 12 v / 18 Watt CFL lamp for 3 Hrs. [8] Q8) a) What is principle of operation of an Microwave oven? What is the power rating and limitations of microwave oven? [8] b) What are the recording formats used for audio CD, video CD & DVD? [8] Q9) a) What is thro ratio of an LCD projector? How computer output is [8] interfaced with the LCD projector? b) Describe main features of EPABX. Explain working of two incoming and 32 extensions EPABX with minimum essential facilities. [8] Q10)Write short notes on any three. [18] a) Fuzzy logic in instrumentation. b) Railway route relay interlocking. c) Electronic ignition system in an automobile. d) Solar water heater for domestic application. e) WLL communication. #### [3764]-1047 2

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