Tribhuvan University
Bachelor of Computer Application
Semester 1 · TU Board 2020
Course Title: Digital Logic (CACS103)
Full Marks: 60Pass Marks: 24Time: 3 hours
Candidates are required to answer the question in their own words as far as possible.
Group B
Attempt any SIX question.(6 × 5 = 30)
- 2.5
Define Digital Logic. Explain digital signal with its applications, advantages and disadvantages.
- 3.5
Define positional number system. Calculate following: a) Subtract 21 from 35 using 2's complement method b) Convert (62.75)₁₀ into single precision floating point format
- 4.5
Define universal gate. Explain Universal gates with their graphical symbol, algebraic expression, truth table, and Venn diagram.
Answer comingAlso asked in 2023
- 5.5
Define Decoder. Explain binary to octal converter with block diagram, truth table and logic diagram.
Answer comingAlso asked in 2026, 2023, 2022, 2021, 2020, 2019
- 6.5
Simplify the Boolean function F(w, x, y, z) = π(0,2,4,6,8,10,12,14) and don't care conditions d(w, x, y, z) = π(1,3,9,11) using K-Map method for both SOP and POS form.
Answer comingAlso asked in 2022, 2021, 2019
- 7.5
Define Multiplexer. Explain 4:1 multiplexer with its block diagram, truth table and logic diagram.
Answer comingAlso asked in 2026, 2023, 2022, 2021, 2020, 2019
- 8.5
Write short Notes on (any Two): a) Parallel Adder b) PLA c) State Diagram
Group C
Attempt any TWO questions(2 × 10 = 20)
- 9.10
Explain JK and T Flip Flop with their Logic and Diagram, graphical symbol, characteristic table, characteristic equation and excitation table.
Answer comingAlso asked in 2024, 2021, 2019, Model question
- 10.10
Differentiate between asynchronous and synchronous sequential circuits with example. Draw a block diagram, truth table and timing diagram to store 2001 in 4-bit SIPO register.
- 11.10
Define counter. Write a procedure to design a counter circuit. Design MOD-8 up counter.
— The End —