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

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## Second 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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