Digital Logic – BSc.CSIT (TU) Question Paper 2069 | Second Semester

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digital logic question paper 2069Second Semester | First Year | Tribhuvan University
Computer Science and Information Technology (Csc. 151)
Digital Logic, Year: 2069
Old Question Collection | Question Bank

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Full Marks: 60 | Pass Marks: 24 | Time: 3 hours.

Candidates are required to give their answers in their own words as far as practicable.
The figures in the margin indicate full marks.

Long Answer Questions:
Attempt any TWO questions.    (2×10=20)

  1. What is decoder? Implement the following using decoder.
    (a) F (W X Y Z) = Σ (0,1,3,4,8,9,10)
    (b) F (W X Y Z) = Σ (1,3,5,6,11,13,14)
  2. What do you mean by asynchronous counter? Design a mod-6 synchronous counter using T flip-flops.
  3. Explain the Master-slave S-R flip-flop with logic diagram, truth table and timing diagram.
    Short answer questions :
    Attempt any eight questions :    (8×5=40)
  4. Design a half subtractor using only NOR gates.
  5. Convert the following decimal numbers into hexadecimal and octal number.
    (a) 220
    (b) 1020
  6. Design a multiplexer 4×1 using only universal gates.
  7. What is J-K flip flop? Explain.
  8. Write a procedure to reduce K-maps.
  9. What are the various types of shift registers?
  10. Draw a logic diagram of a 4 bit ripple counter using D-flip flop.
  11. Differentiate between combinational logic and sequential logic. List some applications of sequential logic.
  12. Explain the decimal adder.
  13. Write short notes on :
    (a) Programmable Logic Array
    (b) Triggering at flip-flop
    (c) Memory Unit
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2 Comments

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