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2003 Course Electronic Product Design

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Total No. of Questions : 12] P1438 [Total No. of Pages : 4 [3764]-223 B.E. (E & TC) ELECTRONIC PRODUCT DESIGN (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section-I and 3 questions from Section-II. 2) Answers to the two sections should be written in separate books. 3) Figures to the right indicate full marks. 4) Use of electronic pocket calculator is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Draw a sketch of front panel of a Laboratory CRO and explain how ergonomic and aesthetic design considerations are taken care of this instrument. [10] b) Explain the Bathtub curve for reliability indicating all its regions. Also explain how failures are reduced prior to shipment of the product. [8] OR Q2) a) Discuss the noise coupling mechanisms and also explain how to minimize these at board level. [6] b) For following situations, suggest suitable suppression device or component/mechanism and also explain how it is effective in [12] suppressing the EMI. i) The power transformer in PLC fails due to 1800 V transient present on AC mains due to switching off a DC motor. ii) When these is a call on cell phone of a person operating PC, the monitor looses synchronization. iii) In a multi PCB industrial DC converter housed in 19" rack, the CPU gets reset whenever one the driver circuit switches on four or more electronic relays. P.T.O.

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