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Fundamentals of Electronics Engineering Unit 4 – Digital Electronics: important questions for AKTU

Unit 4 (Digital Electronics) questions that AKTU repeats most often. This unit carries about 25 marks per paper. Start with the repeated questions, then the most asked topics.

Most repeated Unit 4 questions

  • Simplify the function F(A,B,C,D) = Σm(0,2,5,6,7,13,14,15) + d(8,10) using K-map and implement the simplified function using NAND gates only. (10 marks, 2022, K-Map Minimization) – also asked in 2023, 2024, 2025, 2026
  • Define universal logic Gates. Realize basic logic gates using NAND and NOR gates. (10 marks, 2022, Basic and Universal Gates) – also asked in 2023, 2024, 2025, 2026
  • 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) – also asked in 2022, 2023, 2024

Most important Unit 4 topic

  • K-Map Minimization (Unit 4: Digital Electronics) – asked 14 times in 2022, 2023, 2024, 2025, 2026

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

More 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)

Unit 4 syllabus topics

  • Number Systems and Arithmetic
  • Basic and Universal Gates
  • Boolean Algebra Simplification
  • K-Map Minimization