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2003 Course Electronic Product Design

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Total No. of Questions :12] P1333 [Total No. of Pages :4 [3864]-242 B.E. (Electronics) ELECTRONIC PRODUCT DESIGN (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer any Three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of electronic pocket calculator is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) b) c) With the help of suitable block diagram explain in detail the different stages of an electronic product development. Discuss the implications of skipping particular stage in development. [10] An electronic circuit consists of 4 resistors, 4 capacitors, 1 transistor, 4 diodes and a power transformer. The failure rate of each components are 0.1, 0.01, 0.8, 0.25 and 0.6 per 106 hrs respectively. Calculate i) The MTBF of the circuit. ii) The reliability at t = 1000 hrs. [5] In the far field a 50 dB shielding effectiveness using conductive coating is to be obtained at enclosure level. Calculate the value of coating impedance to achieve this value of SE. [3] OR Q2) a) b) c) State the various objectives of Ergonomics. Also explain how the ergonomics and aesthetic design considerations are satisfied for mobile phone. [8] Discuss the different noise coupling mechanisms and ways to reduce the noise being coupled with suitable sketches. [8] Calculate the value of a decoupling capacitor, if the current is 50 mA and the voltage is changing at the rate of 0.1v/5ns. [2] P.T.O.

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