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Pune University - FY BSc ELECTRONIC SCIENCE - II, April 2010

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Total No. of Questions : 5] P200 [Total No. of Pages : 2 [3717] - 22 F.Y. B.Sc. ELECTRONIC SCIENCE EL1T2 : Principles of Digital Electronics (Paper - II) (New Course) (2008) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates: 1) All questions are compulsory. 2) Neat labelled diagram must be drawn wherever necessary. 3) Use of calculators and log tables is allowed. 4) Figures to the right indicates full marks. Q1) Answer the following questions in brief : [16] a) Define positive logic and negative logic. b) What is hexadecimal number system? Give its examples. c) Draw logic symbol of following gates : AND, NAND, NOR, NOT. d) Write 2 s complement of binary number-101011. e) Define combinational and sequential logic circuits. f) What is decade counter? Name the IC which contain decade counter. g) Define logic families. h) Define memory capacity. Q2) Attempt any Four of the following : [16] a) Draw the logic circuit of two input AND gate using transistors. Write its truth table and explain it. b) Explain the method of converting Gray code to binary code and convert (101011)Gray = (......)2. c) Convert the following i) (35)10 = ( )2 = ( )16 ii) (1110.10)2 = ( )10 = ( )8. d) What is parity bit? Explain how Ex-OR gate can be used as parity generator. e) Draw the logic circuit for the following boolean equations using basic gates i) y = AB + BC + CD; ii) y = (A + B) ( A + C); f) Simplify the given boolean equation and draw the logic circuit using basic logic gates y = AB C + ABC + BC. P.T.O.

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Additional Info : F.Y.BSc. ELECTRONIC SCIENCE EL1T2 : Principal of Digital Electronics (New Course)(2008) (Paper - II), Pune University
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