Tribhuvan University
Bachelor of Computer Application
Semester 1 · Model question
Course Title: Digital Logic (CACS103)
Full Marks: 60Pass Marks: 24Time: 3 hours
Group B
Attempt any SIX question.(6 × 5 = 30)
- 2.5
Convert the following: a. (101101)₂ to decimal b. (45)₁₀ to binary
- 3.5
Subtract 23 from 18 using both 1's and 2's complement method.
Answer comingAlso asked in 2026, 2022, 2021, 2019
- 4.5
Simplify Boolean expressions using K-Map F(A,B,C)=Σ(0,2,4,6) and d= Σ(1,3,)
- 5.5
Describe the working of half adder with logic diagram.
- 6.5
Explain multiplexer with applications.
- 7.5
Explain bidirectional shift register.
Answer comingAlso asked in 2026
- 8.5
Explain different types of flip-flops (RS, JK) with truth table.
Answer comingAlso asked in 2024, 2021, 2020, 2019
Group A
Group A (Very Short Questions) Attempt all questions.(10 × 1 = 10)
- 1.1
a. Define analog signal. b. What is a binary number system? c. What is the need for complement? d. Define a Gray code. Find gray code of 1011010 e. What is a Boolean algebra? How is it different from Binary System? f. What is a basic logic gate? g. Define a combinational circuit. h. What is the race around condition? i. What is a register? j. Define a counter.
Group B
Group B Attempt any SIX questions.(6 × 5 = 30)
- 2.5
Convert the following: a. (101101)₂ to decimal b. (45)₁₀ to binary
- 3.5
Subtract 23 from 18 using both 1's and 2's complement method.
Answer comingAlso asked in 2026, 2022, 2021, 2019
- 4.5
Simplify Boolean expressions using K-Map F(A,B,C)=Σ(0,2,4,6) and d= Σ(1,3,)
- 5.5
Describe the working of half adder with logic diagram.
- 6.5
Explain multiplexer with applications.
- 7.5
Explain bidirectional shift register.
Answer comingAlso asked in 2026
- 8.5
Explain different types of flip-flops (RS, JK) with truth table.
Answer comingAlso asked in 2024, 2021, 2020, 2019
Group C
Group C Attempt any TWO questions.(2 × 10 = 20)
- 9.10
Write the steps for designing a combinational circuit. Design a 4-bit magnitude comparator and explain its working principle.
- 10.10
A JK flip-flop is subjected to continuous clock pulses and both J and K inputs are HIGH. a. Explain what happens in a simple JK flip-flop. b. Explain how a Master-Slave configuration resolves this issue. c. Illustrate your answer using a timing diagram
- 11.10
Design a 4-bit binary counter using JK flip-flops. a. Show logic diagram b. Explain counting sequence c. Analyze timing behavior
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