Digital Electronics (BOE310) - AKTU Question Paper 2025-26
B.Tech · Semester 3 · Free PDF Download
This is the official AKTU Digital Electronics Previous Year Question Paper for B.Tech Semester 3, academic session 2025-26. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 3
Session:2025-26
University:AKTU / UPTU
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Questions Asked in 2025-26
Digital Electronics (BOE310) — extracted question text · 70 marks · 3 Hours
Section AAttempt all questions in brief. 02 x 7 = 14
- aRepresent the decimal number 45 in binary and octal number systems
- bDifferentiate between combinational and sequential circuits (any two points)
- cState the function of an encoder
- dWhat is a multiplexer? Write any two applications
- eWhat is a shift register? Name any two types
- fWhat is a hazard in digital circuits?
- gWhat is noise margin in logic families?
Section BAttempt any three of the following: 07 x 3 = 21
- aExplain binary subtraction using 2’s complement method with a suitable example
- bDesign a full subtractor circuit using two half subtractors and basic gates
- cDescribe the construction and working of a Johnson counter
- dExplain the steps involved in state assignment of synchronous sequential circuits
- eCompare TTL, ECL and CMOS logic families with respect to power dissipation, speed and noise immunity
Section CAttempt any one part of the following: 07 x 1 = 07
- aWhat is Excess-3 code? Convert (57)₁₀ to Excess -3 code and explain the advantages of Excess-3 code over BCD
- bUsing K-map, minimize the Boolean function and implement it using only NAND gates
- aExplain the operation of a 4-bit priority encoder with truth table and logic diagram
- bDesign a Full Adder using two Half Adders and basic gates
- aExplain the working of a D flip -flop using logic diagram, truth table and characteristic equation
- bExplain Ring Counter with diagram and applications
- aExplain race conditions in asynchronous sequential circuits
- bExplain the complete design procedure of a synchronous sequence detector using state diagram and state table
- aExplain fan-in, fan-out and power dissipation in CMOS logic family
- bDifferentiate between PLA and PAL. Explain how a given Boolean function can be realized using a PLA
Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.
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