Fundamentals of Electronics Engineering Unit 4 – Digital Electronics: AKTU previous year questions
41 AKTU questions from Unit 4 (Digital Electronics) asked in 2022–2026, tagged by marks, year and topic. In short: about 25 marks of every paper come from this unit; the most asked topic is K-Map Minimization (14 times); 33 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 4 previous year questions
- What are the basic laws and theorems of Boolean algebra? (2 marks, 2026, Boolean Algebra Simplification)
- Determine base of the following: (i) (211)X = (152)8 (ii) (193)X = (623)8. (2 marks, 2026, Number Systems and Arithmetic)
- Simplify the function F= ∑m(0,3,5,7,8,9,10,12,13) + ∑d(1,6,11,14) using K-map and also implement the simplified expression using Basic gates only. (7 marks, 2026, K-Map Minimization)
- Perform following operation as indicated:- (i) Convert (472.254)8 to its decimal value (ii) Subtract using 1's complement: (10111)2 - (110011)2. (iii) Calculate the 1's and 2's complement of binary number 1010101. (iv) Subtract using 2's complement: (1010)2 – (0101)2. (v) Convert (5678)10 into BCD. (7 marks, 2026, Number Systems and Arithmetic)
- (i) Define universal logic Gates. Realize XOR, XNOR gates using NAND and NOR gate only. (ii) Prove the following Boolean functions: AB+ABC+AB̄=A and AB̄+ĀB+AB+ĀB̄=1 (7 marks, 2026, Basic and Universal Gates)
- Why is NAND gate called a 'universal gate'? Realize NOT gate using NAND gate only. (2 marks, 2025, Basic and Universal Gates)
- Why are NAND and NOR gates called universal gates? (2 marks, 2025, Basic and Universal Gates)
- Find 1's and 2's complement of 10011010. (2 marks, 2025, Number Systems and Arithmetic)
- What are the binary-arithmetic operations for 11.10 + 10.11 + 111.00 + 110.11+ 001.01=? (2 marks, 2025, Number Systems and Arithmetic)
- Distinguish between POS & SOP. Convert the given expression in standard SOP form. F (A, B, C) = AB+BC+CA (7 marks, 2025, Boolean Algebra Simplification)
- Minimize the four variable logic function using k-map f (A,B,C,D)=Σm(0,1,2,3,5,7,8,9,11,14) (7 marks, 2025, K-Map Minimization)
- F =∑(0,1,2,3,5,7,13,15) + d(8,10) simplify using K-Map and design logic resultant circuit using basic logic gates. (7 marks, 2025, K-Map Minimization)
Most asked Unit 4 topics
- K-Map Minimization – asked 14 times
- Number Systems and Arithmetic – asked 12 times
- Basic and Universal Gates – asked 8 times
Unit 4 question pattern
- 2-mark questions: 15 asked in 2022–2026
- 7-mark questions: 20 asked in 2022–2026
- 10-mark questions: 6 asked in 2022–2026
- About 25 marks from Unit 4 in every paper
- 33 questions were asked again in a later year
Unit 4 questions year by year
- 2026: 5 Unit 4 questions asked (25 marks across that year's papers)
- 2025: 9 Unit 4 questions asked (43 marks across that year's papers)
- 2024: 10 Unit 4 questions asked (50 marks across that year's papers)
- 2023: 7 Unit 4 questions asked (44 marks across that year's papers)
- 2022: 10 Unit 4 questions asked (68 marks across that year's papers)