JNTUH
JNTUH B.Tech II DIGITAL SYSTEM DESIGN Previous Question Paper (April/May - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
Given that (292)10 = (1204)b, determine the value of b.
Answer
To find the base b, we express the decimal number 292 in terms of powers of b based on the given representation (1204)b:
Simplifying the equation:
Testing integer values for b, if b = 6: 216 + 2(36) = 216 + 72 = 288. Since 288 - 288 = 0, the base b is 6.
Write short notes on weighted binary codes.
Answer
Weighted binary codes are a class of digital codes where each bit position is assigned a specific numerical weight. In these systems, the value of a decimal digit is calculated by summing the products of each bit's value (0 or 1) and its corresponding weight.
A general weighted code can be represented by the formula:
where b_i represents the binary digit at position i and w_i represents the weight assigned to that position. The most common example is the standard 8421 BCD (Binary Coded Decimal) code, where the weights for the four bit positions are 8, 4, 2, and 1 respectively. Other examples include the 2421 code and the 5421 code. These codes are primarily used for decimal-to-binary conversion and arithmetic operations within digital systems.
What is the difference between Decoder and Demultiplexer?
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Define a combinational logic circuit and give some examples.
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What is a Flip-Flop? What is the difference between Flip Flop and Latch
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Give the excitation table and characteristic equations of SR and JK Flip Flops
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What are Meely and Moore models?
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What are Finite State Machines and what are their limitations?
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Draw the circuit diagram of OR gates using discrete components.
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State advantages and disadvantages of TTL.
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PART - B
Perform the following using BCD arithmetic. i) (79)10 + (177)10 ii) (481)10 + (178)10
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Obtain the Dual and complement to the following Boolean expressions: i) F = AB + A(B + C) + B' (B + D) ii) F = A + B + A'B'C
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Place the following equations into proper canonical form. i) F(A, B, C) = AB' + AC' + BC ii) F(A, B, C, D) = (A + B')(A + B' + D)
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State and prove consensus theorem.
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Simplify F(A,B,C,D) = Σ(4,5,6,7,12,13,14) + d(1,9,11,15) using K-map
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With a neat design procedure, explain the implementation of a 4-bit Magnitude Comparator.
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What is Encoder? Design an octal to binary Encoder.
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Reduce the expression using Quine McCluskey's method F(x1, x2, x3, x4, x5) = Σm(0, 2, 4, 5, 6, 7, 8, 10, 14, 17, 18, 21, 29, 31) + Σd(11, 20, 22).
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With a neat diagram, explain the operation of bidirectional shift register.
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Describe the conversion of SR-FlipFlop to JK-FlipFlop.
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With a neat diagram, explain the operation of a 10-bit ring counter.
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Explain the operation of synchronous and asynchronous counter.
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Design a sequential circuit for the diagram shown in the figure.
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Discuss about the capabilities of Finite State Machines.
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Explain in detail about state equivalence and machine minimization.
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With an example, describe state reduction in an incompletely specified machine.
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Draw the circuit of CMOS NOR gate and explain its operation. List some of the advantages of CMOS over other logic families.
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Explain about Fan-In, Fan-Out, Tri-state gate.
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Draw and explain the circuit of 2-input NAND and 2-input NOR gates using CMOS.
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Draw the symbol of CMOS transmission gate and write its advantages and applications.
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