Digital Electronics (BOE310) AKTU previous year questions 2022–2026
Every Digital Electronics question from 10 AKTU papers, tagged by unit, topic and marks. A few recent questions from each unit are listed below; open the page to filter by unit, topic or mark type.
Unit 1: Digital System, Binary Numbers and Logic Simplification – AKTU PYQs
- 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 2: Combinational Logic – AKTU PYQs
- State the function of an encoder. (2 marks, 2026, Encoders and Decoders)
- What is a multiplexer? Write any two applications. (2 marks, 2026, Multiplexer and Demultiplexer)
- Design a full subtractor circuit using two half subtractors and basic gates. (7 marks, 2026, Adders and Subtractors)
- Explain the operation of a 4-bit priority encoder with truth table and logic diagram. (7 marks, 2026, Encoders and Decoders)
- Design a Full Adder using two Half Adders and basic gates. (7 marks, 2026, Adders and Subtractors)
Unit 3: Sequential Logic and Its Applications – AKTU PYQs
- 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)
Unit 4: Synchronous and Asynchronous Sequential Circuits – AKTU PYQs
- What is a hazard in digital circuits? (2 marks, 2026, Hazards in Digital Circuits)
- Explain the steps involved in state assignment of synchronous sequential circuits. (7 marks, 2026, Synchronous Circuit Analysis)
- Explain race conditions in asynchronous sequential circuits. (7 marks, 2026, Asynchronous Circuit Design)
- Explain the complete design procedure of a synchronous sequence detector using state diagram and state table. (7 marks, 2026, Synchronous Circuit Design Procedure)
- What are essential hazards? (2 marks, 2025, Hazards in Digital Circuits)
Unit 5: Memory, Programmable Logic and Digital Logic Families – AKTU PYQs
- What is noise margin in logic families? (2 marks, 2026, Digital Logic Families)
- Compare TTL, ECL and CMOS logic families with respect to power dissipation, speed and noise immunity. (7 marks, 2026, Digital Logic Families)
- Explain fan-in, fan-out and power dissipation in CMOS logic family. (7 marks, 2026, Digital Logic Families)
- Differentiate between PLA and PAL. Explain how a given Boolean function can be realized using a PLA. (7 marks, 2026, PLA and PAL Devices)
- What is fan-out? (2 marks, 2025, Digital Logic Families)