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Previous Year Exam Questions for Digital Electronics Circuit - DEC of 2019 - BPUT by Bput Toppers

  • Digital Electronics Circuit - DEC
  • 2019
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Electrical Engineering
  • B.Tech
  • Uploaded 6 months ago
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Registration No : Total Number of Pages : 01 B.Tech PCEC4202 4th Semester Back Examination 2018-19 DIGITAL ELECTRONICS CIRCUIT BRANCH : ELECTRICAL Time : 3 Hours Max Marks : 70 Q.CODE : F1011 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Q1 a) b) c) d) e) f) g) h) i) j) Answer the following questions : State the advantages of CMOS logic. Write the differences between Demultiplexer and decoder. Give the truth table of transparent latch. Define noise margin. Draw the logic diagram of 4-bit parallel subtractor. What is memory expansion and why it is required? Write the difference between Moore’s and Mealy model. Draw the general model of ASM. Briefly explain about EPROM. Realize the OR gate and AND gate using NOR gate. Q2 a) b) Express the Boolean functions F = AB’+C in a sum of minterms. Solve using K-Map. ∑(0,1,2,5,7,8,9,10,15,18) (5) (5) Q3 a) Implement Boolean expression using minimum number of 3 input NAND gate ( , , , ) = ∑(1,2,3,4,7,9,10,12) Discuss the features and functional blocks of FPGA. (5) b) (2 x 10) (5) Q4 a) b) Discuss about the operation of TTL NAND gate. Draw the MSOP representation for ( , , , , ) = (1,4,6,10,20,22,24,26) + (0,11,16,27) using K-Map method. Draw the circuit of the minimal expression using only NAND gates. (5) (5) Q5 a) Explain how a state graph of a sequential machine can be converted to an equivalent ASM chart. Discuss in detail about the Pulse-Triggered S-R flip flop. Also draw the output waveform of this flip flop and explain it with example. (5) Q6 Using D flipflops design a Synchronous counter which counts in the sequence. 000, 001, 010, 011, 100, 101, 110, 111, 000 (10) Q7 Draw and explain the 4-bit SISO, SIPO, PISO and PIPO shift register with its waveforms. (10) b) Q8 a) b) c) Write short answer on any TWO : Programmable Logic Array(PLA) Static and Dynamic RAM 4 bit binary to gray code converter. (5) (5 x 2)

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