Digital Electronics (KEE401) - AKTU Question Paper 2021-22
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 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
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Questions Asked in 2021-22
Digital Electronics (KEE401) — complete question paper
- aIdentify the value of x in the expression 16 8(56.1A) ( )x . 1
- bPerform the subtraction (101101-100110) 2 using 2’s complement method. 1
- cCompare serial adder and parallel adder. 2
- dWhat is difference between combi national and sequential circuits. 2
- eThe content of 4 bit register is initially 1101. The register is sifted six time to right with the serial input being 101101. What is the conten t of the register after sixth shift?
- fIf in an edge triggered JK flip flop, J=1, K=1 and Q=1, when t he clock pulse goes HIGH, what would be the next sate of Q
- gDefine critical race and n on-critical race conditions. 4
- hDifferentiate synchronous and a synchronous sequential circuits. 4 i. Write the advantage and disadva ntages of TTL and CMOS logic family 5 j. Explain fan-in and fan-out in logic families. 5
- aSimplify the following Boolean function using K-map and also draw the simplified logic circuit using basic logic gates. ( , , , ) (0,1,5,6,12,13,14) (2, 4)mfA B C D d
- bImplement the function (,, , ) ( 0 , 1 , 2 , 5 , 8 , 1 3 , 1 4 )mYA B C D using 8:1 multiplexer. Consider A, B, C as the select lines
- cDifferentiate between synchronous and asynchronous counters. Design a 2 bit synchronous UP counter
- dAn asynchronous sequential circ uit with two excitation funct ion with two feedback loop is given as: 112Yx yx y ; 21 2Yx y x y (i) Draw the logic diagram of the circuit. (ii) Derive the transition table & obtain the flow table
- eDifferentiate RAM and ROM. E xplain various types of ROM. 5
- aExplain Error detecting and Error correcting codes. A seven- bit Hamming code coming out of a transmission line is 1000010. What was the original code transmitted? Consider the even parity check
- bExpress the design of Ex- OR gate with the help of (i) NAND gates only and (ii) NOR gates only
- aExplain the design of a Full adder, with its truth table and Boolean expression
- bDesign a Binary Code to Gray code Converter, Also show its t ruth table, Boolean expression and logic diagram
- aDiscuss the Race around condition of JK flip flop. How JK fl ip-flop can be used as T flip-flop, Explain the design procedure
- bAnalyze RS flip –flop using NAND-NAND logic and obtain its characteristic equation and exci tation table. Explain how will you convert it in D Flip-flop
- aImplement the circuit defi ned by the following transition table with a NOR SR Latch. Also show the implementation with NAND SR latch
- bWrite the design procedure for clocked sequential circuits a nd implement the following state diagram
- aExplain PLA and PAL. Implemen t the given Boolean function with a PLA. 1(,, ) ( 4 , 5 , 7 )mYA B C ; 2 (,, ) ( 3 , 5 , 7 )mYA B C
- bConstruct the following logic gates from NMOS and PMOS logic Families (i) NAND (ii) NOR
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 — KEE401
Questions that appeared in more than one session, found by comparing 2 years of Digital Electronics papers (2021-22, 2022-23)
What is difference between combi national and sequential circuits. 2
Appeared in: 2021-22 · 2022-23
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