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Digital Electronics Unit 1 – Digital System, Binary Numbers and Logic Simplification: important questions for AKTU

Unit 1 (Digital System, Binary Numbers and Logic Simplification) questions that AKTU repeats most often. This unit carries about 36 marks per paper. Start with the repeated questions, then the most asked topics.

Most repeated Unit 1 questions

  • 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) – also asked in 2022, 2023, 2024, 2026
  • Implement the Boolean expression using only NAND gate. Y=((A+B)C)D (7 marks, 2025, NAND NOR Implementation) – also asked in 2022, 2023, 2024, 2026
  • Simplify the Logical Expression F(A,B,C,D)=∑m(1,3,7,11,15) + d(0,2,5) (7 marks, 2024, Karnaugh Map Simplification) – also asked in 2022, 2023, 2025, 2026

Most important Unit 1 topic

  • Karnaugh Map Simplification (Unit 1: Digital System, Binary Numbers and Logic Simplification) – asked 17 times in 2022, 2023, 2024, 2025, 2026

Most asked Unit 1 topics

  • Karnaugh Map Simplification – asked 17 times
  • NAND NOR Implementation – asked 13 times
  • Number Systems and Arithmetic – asked 12 times

More 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)

Unit 1 syllabus topics

  • Number Systems and Arithmetic
  • Binary Codes and Conversion
  • Boolean Algebra and De Morgan
  • Karnaugh Map Simplification
  • NAND NOR Implementation
  • Quine McClusky Tabular Method