B.TechSemester 32025-26Digital ElectronicsBOE310

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) — complete question paper · 70 marks · 3 Hours

Section AAttempt all questions in brief. 02 x 7 = 14

a
Represent the decimal number 45 in binary and octal number systems
b
Differentiate between combinational and sequential circuits (any two points)
c
State the function of an encoder
d
What is a multiplexer? Write any two applications
e
What is a shift register? Name any two types
f
What is a hazard in digital circuits?
g
What is noise margin in logic families?

Section BAttempt any three of the following: 07 x 3 = 21

a
Explain binary subtraction using 2’s complement method with a suitable example
b
Design a full subtractor circuit using two half subtractors and basic gates
c
Describe the construction and working of a Johnson counter
d
Explain the steps involved in state assignment of synchronous sequential circuits
e
Compare 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

a
What is Excess-3 code? Convert (57)₁₀ to Excess -3 code and explain the advantages of Excess-3 code over BCD
b
Using K-map, minimize the Boolean function and implement it using only NAND gates
a
Explain the operation of a 4-bit priority encoder with truth table and logic diagram
b
Design a Full Adder using two Half Adders and basic gates
a
Explain the working of a D flip -flop using logic diagram, truth table and characteristic equation
b
Explain Ring Counter with diagram and applications
a
Explain race conditions in asynchronous sequential circuits
b
Explain the complete design procedure of a synchronous sequence detector using state diagram and state table
a
Explain fan-in, fan-out and power dissipation in CMOS logic family
b
Differentiate 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. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

Repeated Questions — BOE310

Questions that appeared in more than one session, found by comparing 2 years of Digital Electronics papers (2024-25, 2025-26)

Explain Ring Counter with diagram and applications

Appeared in: 2024-25 · 2025-26

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