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1997 Course Opto-Electronics

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Total No. of Questions :10] [Total No. of Pages : 2 P1606 [3764]-1066 B.E. (Industrial Electronics) OPTO - ELECTRONICS (1997 Course) Time :3 Hours] [Max. Marks : 100 Instructions to 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) Your answers will be valued as a whole. 6) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. SECTION - I Q1) a) Classify the opto-electronics devices and explain the bulk photo detector. [8] b) What are different types of opto-couplers? How to select opto coupler for specific application? [8] Q2) a) b) Q3) a) b) With neat diagram explain Ruby LASER. [8] How to use solar cell for battery charging? [8] Explain principle of holography. [8] How to measure displacement using optical devices. [8] Q4) a) Compare single mode and multimode step-index and graded index optical fibers. [8] b) 2 Show that the numerical aperture of step index fiber is given as n12 n2 , Where n1 and n2 are refractive indices of core and cladding. [4] Calculate the numerical aperture of step index fiber having n1 = 1.48 and c) n2 = 1.46. What is the maximum entrance angle 0 max for this fiber if the outer medium is air. [4] P.T.O.

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