Digital Electronics Unit 1 – Digital System, Binary Numbers and Logic Simplification: AKTU previous year questions
69 AKTU questions from Unit 1 (Digital System, Binary Numbers and Logic Simplification) asked in 2022–2026, tagged by marks, year and topic. In short: about 36 marks of every paper come from this unit; the most asked topic is Karnaugh Map Simplification (17 times); 65 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 1 previous year questions
- Represent the decimal number 45 in binary and octal number systems. (2 marks, 2026, Number Systems and Arithmetic)
- Differentiate between combinational and sequential circuits (any two points). (2 marks, 2026, Boolean Algebra and De Morgan)
- Explain binary subtraction using 2's complement method with a suitable example. (7 marks, 2026, Number Systems and Arithmetic)
- What is Excess-3 code? Convert (57)₁₀ to Excess-3 code and explain the advantages of Excess-3 code over BCD. (7 marks, 2026, Binary Codes and Conversion)
- Using K-map, minimize the Boolean function and implement it using only NAND gates: F(A,B,C,D)=Σm(0,2,4,5,8,10,12,13). (7 marks, 2026, Karnaugh Map Simplification)
- What are SOP and POS forms? (2 marks, 2025, Boolean Algebra and De Morgan)
- Convert the following binary number into grey code. 1. (110111)₂ 2. (100110)₂ (2 marks, 2025, Binary Codes and Conversion)
- Which logic gates are called universal gates? (2 marks, 2025, NAND NOR Implementation)
- Perform the subtraction using 2's complement method of the following (1100)₂-(11101)₂ (2 marks, 2025, Number Systems and Arithmetic)
- Convert the following numbers to their respective bases: i) (47.625)₁₀ to binary ii) (101101.101)₂ to decimal iii) (3F9)₁₆ to decimal iv) (543)₈ to binary (7 marks, 2025, Number Systems and Arithmetic)
- Simplify the Boolean expression using K-map F (A, B, C, D) = ∏ M (4,5,6,7,8,12). d (0, 1, 2, 3, 9, 11, 14) (7 marks, 2025, Karnaugh Map Simplification)
- Simplify and minimize the following four variable switching function using Quine-McCluskey tabulation method. f(A,B, C, D)=∑m(0,1,2,3, 4, 6,8, 9, 10, 11) (7 marks, 2025, Quine McClusky Tabular Method)
Most asked Unit 1 topics
- Karnaugh Map Simplification – asked 17 times
- NAND NOR Implementation – asked 13 times
- Number Systems and Arithmetic – asked 12 times
Unit 1 question pattern
- 2-mark questions: 32 asked in 2022–2026
- 7-mark questions: 12 asked in 2022–2026
- 10-mark questions: 25 asked in 2022–2026
- About 36 marks from Unit 1 in every paper
- 65 questions were asked again in a later year
Unit 1 questions year by year
- 2026: 5 Unit 1 questions asked (25 marks across that year's papers)
- 2025: 10 Unit 1 questions asked (50 marks across that year's papers)
- 2024: 5 Unit 1 questions asked (25 marks across that year's papers)
- 2023: 31 Unit 1 questions asked (182 marks across that year's papers)
- 2022: 18 Unit 1 questions asked (116 marks across that year's papers)