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BSc CSIT 1st Sem Exam Paper || Digital Logic


Section A: Attempt any two questions.

  1. Implement the function F(A, B, C, D) = Σm(0, 1, 2, 6, 8, 9) using (a) Multiplexer, (b) Decoder, and (c) PLA.

  2. What is a Magnitude Comparator? Design a 4-bit magnitude comparator using logic gates.

  3. What do you mean by a ripple counter? Explain the design procedure of a synchronous sequential circuit using an example.

 

Section B: Attempt any eight questions.

  1. (a) Convert (43)₁₀ into hexadecimal and (12)₁₀ into octal. (b) Perform (+43)₁₀ - (-12)₁₀ in binary using signed 2's complement representation for negative numbers.

  2. Design a 4x2 priority encoder circuit.

  3. Reduce the function F = B'DA'BC + AB'C + ABC' using K-Map and implement the reduced function using NAND gates only.

  4. Draw the logic circuits of 4-to-1 line Multiplexer. Describe its operation briefly.

  5. How does a JK flip-flop differ from a D flip-flop in its basic operation? Draw a JK flip-flop circuit using a D flip-flop.

  6. Design a 4-bit ripple counter using D flip-flops.

  7. What is the difference between serial and parallel transfer? What type of registers can be used to convert serial data to parallel and parallel data to serial?

  8. Explain Shift Register with Parallel Load and its practical implications.

  9. Write short notes on (any two): (a) State Diagram (b) Negative Logic (c) Programmable Array Logic (PAL)

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