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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.

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