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2003 Course Electronic Product Design

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Total No. of Questions : 12] [Total No. of Pages :4 [3864] - 263 B.E. (E & T/C) ELECTRONIC PRODUCT DESIGN (2003 Course) P1147 Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer 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) Explain the bathtub curve for reliability indicating all its regions. Also explain how failures in different regions are reduced? [8] b) What are the different types of transient suppressors? What is the selection criteria to select TVS for any application. [8] c) Define shielding effectiveness & state on which factor it depends. [2] OR Q2) a) With the help of neat block schematic explain the different stages of an electronic product development. What will be the effect on development if any one of the stage is skipped? [12] b) State the different basic ergonomics requirements for any product design. [6] Explain the main factors to be considered for signal conductors in: [8] Q3) a) i) High frequency amplifiers / oscillators. ii) Low level signal amplifiers. P.T.O. b) Estimate the parasitic values for the following geometries of PC tracks: i) Resistance of 150mm long copper track with 0.8mm width on standard 35 micron copper clad laminate. (Assume resistivity of Cu = 1.72 x 10-6 - cm) ii) Capacitance of two 0.15 cm wide tracks on opposite face of double sided PCB, each with a track length of 15 cm. The thickness of PCB laminate is 1.6 mm and relative permittivity is 4.2. [8] OR Q4) a) Discuss which factors should be carefully considered while designing high - speed boards? [8] b) A twisted pair wire is used to carry a signal. The dimensions of twisted pair are as follows: [8] i) Diameter of conductor = 0.02 inch. ii) Separation between centers = 0.1 inch. iii) Length of twisted pair = 2.0 inch. iv) Relative dielectric constant of medium between wires r = 2.5. Calculate 1) Characteristic impedance. 2) Propagation delay offered by wire. Q5) a) b) What is signal integrity? What are the issues to be considered while ensuring signal integrity in high - speed design? [8] Explain with justification & schematic arrangement the type of instrument that should be used to find faults in following circuits: i) ii) Combinational logic circuit producing glitches. Sequential logic circuit producing erratic o/p due to slow rising edge of CLK. [8] OR Q6) a) Explain the use and limitations of : i) Operating point analysis. ii) [8] AC analysis. b) Compare simulation with prototyping. [4] c) What are the capabilities of MSO. [4] [3864] - 263 -2- SECTION - II Q7) a) With the help of real life microprocessor based product justify how all the recommended steps in a software development are implemented.[8] b) A software is to be developed for ECG system. Explain the factors that determine the choice between assembly language and high level language.[8] OR Q8) a) Explain the different stages in software development at which bugs may enter. List the common bugs and how to overcome these bugs. [8] What are the desirable features of : [8] b) i) ii) Assemblers. Cross Compilers. Q9) a) What is CE Marking? What is the need of CE marking? What are the different objectives of CE marking? [8] b) Specify with justification the choice of environmental tests to be carried out on following products: (any two) [8] i) ii) iii) Q10)a) b) CNC Machine. Domestic washing machine. Vacuum cleaner. OR Explain the importance of shielded room when EMI/EMC tests are conducted. [8] Explain the different temperature tests carried out on industrial product. Also indicate the various parameters related to each test. [8] Q11)With suitable electronic product, draw/prepare the following documents: (any four) [18] a) PCB fabrication drawing. b) Wiring diagram. c) Product test specifications. d) Bill of material. e) Interconnection diagram. [3864] - 263 -3- OR Q12)a) Justify : i) ii) iii) b) Engineering note book is foundation of any engineering work. [9] Documentation is integral part of any product. Bill of material is considered to be the basic product document. Explain in detail (any two) [9] i) User manual of TV. ii) Application manual for a software product. iii) Service manual of oscilloscope. ***** [3864] - 263 -4-

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