B.TechSemester 42022-23Digital ElectronicsKEE-401

Digital Electronics (KEE-401) - AKTU Question Paper 2022-23

B.Tech · Semester 4 · Free PDF Download

This is the official AKTU Digital Electronics Previous Year Question Paper for B.Tech Semester 4, academic session 2022-23. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 4

Session:2022-23

University:AKTU / UPTU

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Questions Asked in 2022-23

Digital Electronics (KEE-401) — complete question paper

Section AAttempt all questionsinbrief. 2 x 10 = 20

a
Explain Duality Principle. Prove that positive logic AND Gate is equivalent to negative logi c OR Gate
b
Explain 2-input EX-NOR Gate and implement it using minimum number of 2- input NOR Gates
c
Explain Half adder circuit and implement it using 2-input NAND Gates
d
Write down the differences between Combinational and Sequential digital circuits
e
Differentiate between Synchronous and Asynchronous sequential circuits
f
Explain in brief:- (i) Astable Multivibrator (ii) Bistable Multivibrator
g
Explain the working of a PISO type shift register briefly
h
What are Static and Dynamic Hazards? (i) What is Noise Margin? (j) What are the advantages of CMOS logic family?

Section BAttempt any three ofthefollowing: 10x3=30

a
Find the Simplified logical expression for Y. Implement a 1:8 De-mux with selection lines A,B,C using 1:2 De-mux. Verify your implementation with the help of Truth Tables
c
What is Race-Around condition in J-K flip-flop? Explain it’s solution Master- Slave J-K Flip -Flop
d
Given the conditions, such that If input A = 0, the circuit oscillates between either one of the two cases. Case1:- 00-01-00-01 and Case2:- 10-1 1-10-11 And If A = 1, it switches inter between two cases. Draw the state transition diagram and implement the same using JK flip -flop and by using basic logic gates
e
Implement a 3-input NOR Gate using CMOS and DTL logic families. Also Explain the working in both cases

Section CAttempt any one part ofthe following: 10x1=10

a
Implement NOT, OR, AND , EX-OR, EX-NOR, NOR (all 2-inputs except NOT Gate) gates using minimum number of 2 -input NAND Gates
b
Convert all possible 4-bit binary codes into Gray Code. Also show the implementation circuit using 2 -input EX -OR Gates only
a
Implement a circuit using logic gates that compares the magnitudes of two 4- bit numbers
b
Implement the Boolean function F(A,B,C,D)= ∑m(0,1,2,5,8,13,14) using 8:1 MUX with A,C,D as selection lines
a
Implement S-R, T, D flip-flops using J-K flip-flop. Also show the implementation with help of State Tables
b
Design a MOD-12 asynchronous down counter using T flip-flops
a
Given a sequential logic circuit expression as X(t+ 1) = p’X + pY Y(t+1) = pX’+p’Y where X and Y are the two flip-flop outputs and pis the main external input. Draw the state transition table for the above- given logic f unction. Also, draw the state transition diagramassociated with it. Design a synchronous3-bitFSM (which can be used for counting) using D flip-flops with no external inputs and count sequence as follows:- 0- 1-3-7-4-2-0
a
Explain Propogation delay in logic families. Also explain why TPLH >T PHL
b
Explain ROM and its various types. Implement a 4-T SRAM cell using MOSFETs

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.