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Pune University - FY BSc ELECTRONIC SCIENCE - II, April 2010 (Old Course)

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Total No. of Questions : 5] [Total No. of Pages : 2 P241 [3717] - 73 F.Y. B.Sc. ELECTRONIC SCIENCE EL1-T2 : Principles of Digital Electronics (Paper - II) (2004 Old Course) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates: 1) All questions are compulsory. 2) Draw neat labelled diagrams wherever necessary. 3) Use of calculator and logtable is allowed. 4) Figures to the right indicate full marks. Q1) All questions are compulsory : a) What is Multiplexer? b) [16] Name the following IC'S. i) c) 7400 ii) 7402 Convert the following decimal to hexadecimal number i) (12)10 ii) (20)10 d) Write full form of BCD and ASC II code. e) Write 1 s complement for following numbers i) 1010011 ii) 1110001 f) Write output (y) equation for following circuit. g) Draw the symbol of EX-OR gate. h) What is decoder? P.T.O. Q2) Attempt any four of the following : [16] a) Explain how pair quad octet can help for simplifying K-Map. b) Explain the basic circuit diagram for transistor NOT GATE. c) State and verify Demorgan s theorems. d) Convert the following i) (101101) 2 ii) (11001)2 in to gray code. e) Draw logic circuit of 2 : 1 line multiplexer, explain its action with truth table. f) What is meant by half subtractor? Explain half subtractor in detail. Q3) Attempt any four of the following : a) b) c) d) e) f) [16] Simplify the expression AB + ABC + A B using boolean algebra. Draw logic diagram of 1:4 line Demultiplexer explain its action with truth table. Draw AND GATE, NOT GATE and OR GATE using NAND GATES only. What is flip-flop? What are the limitations of S-R flip-flop. Perform the following subtraction (18)10-(15)10 using 2 s complement. Explain with logic diagram decimal to BCD encoder. Q4) Attempt any two of the following : [16] a) i) Write a note on Priority encoder. ii) Draw three input OR GATE using diode circuit, explain its working. b) What is decade counter? Name the IC which contain the decade counter. Explain the function of Ro(1) and Ro(2) and Rg(1) and Rg(2). c) Explain with logic diagram SISO and SIPO shift register. Q5) Attempt a) i) ii) b) i) ii) c) any two of the following : [16] Write the use of ring counter using shift register. Draw the circuit of three bit down counter. Explain its working. Distinguish between sycronous and Asycronous counter. Explain the working of J-K flip-flop with logic diagram and truth table. Describe BCD to seven segment display driver. vvvv [3717]-73 2

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Additional Info : F.Y. B.Sc. ELECTRONIC SCIENCE - II : ELECTRONIC SCIENCE EL1- T2 : Principal of Digital Electronics (Paper - II) (2004 Old Course), Pune University
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