Digital Electronics Unit 3 – Sequential Logic and Its Applications: AKTU previous year questions
55 AKTU questions from Unit 3 (Sequential Logic and Its Applications) asked in 2022–2026, tagged by marks, year and topic. In short: about 32 marks of every paper come from this unit; the most asked topic is Latches and Flip Flops (32 times); 42 questions came back in a later year. The latest ones are listed below; on the page you can filter them by 2-mark or long questions, topic and repeats.
Unit 3 previous year questions
- What is a shift register? Name any two types. (2 marks, 2026, Shift Registers)
- Describe the construction and working of a Johnson counter. (7 marks, 2026, Johnson and Ring Counter)
- Explain the working of a D flip-flop using logic diagram, truth table and characteristic equation. (7 marks, 2026, Latches and Flip Flops)
- Explain Ring Counter with diagram and applications. (7 marks, 2026, Johnson and Ring Counter)
- Elucidate the race around condition in sequential circuit. (2 marks, 2025, Latches and Flip Flops)
- What is the advantage of a synchronous counter over an asynchronous counter? (2 marks, 2025, Synchronous Counters)
- Discuss the R-S flip flop in detail. (2 marks, 2025, Latches and Flip Flops)
- Define bi-directional shift register. Draw and explain 3-bit bi-directional shift register using D flip-flop. (7 marks, 2025, Shift Registers)
- Explain flip-flop conversion. How can a JK flip-flop be converted into a D flip-flop? (7 marks, 2025, Latches and Flip Flops)
- Design a synchronous binary MOD-6 counter. (7 marks, 2025, Synchronous Counters)
- What are synchronous counters? Explain the design and working of a 4-bit synchronous counter. (7 marks, 2025, Synchronous Counters)
- Explain Johnson counters with timing diagrams and applications. (7 marks, 2025, Johnson and Ring Counter)
Most asked Unit 3 topics
- Latches and Flip Flops – asked 32 times
- Shift Registers – asked 9 times
- Synchronous Counters – asked 8 times
Unit 3 question pattern
- 2-mark questions: 20 asked in 2022–2026
- 7-mark questions: 11 asked in 2022–2026
- 10-mark questions: 24 asked in 2022–2026
- About 32 marks from Unit 3 in every paper
- 42 questions were asked again in a later year
Unit 3 questions year by year
- 2026: 4 Unit 3 questions asked (23 marks across that year's papers)
- 2025: 8 Unit 3 questions asked (41 marks across that year's papers)
- 2024: 3 Unit 3 questions asked (21 marks across that year's papers)
- 2023: 25 Unit 3 questions asked (170 marks across that year's papers)
- 2022: 15 Unit 3 questions asked (102 marks across that year's papers)