Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (CSE-IT)- Computer Science Engineering -Information Technology 2020 December 3rd Sem 76435 Digital Electronics Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (CSE/IT) (2018 Batch) (Sem.?3)
DIGITAL ELECTRONICS
Subject Code : BTES-301-18
M.Code : 76435
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1.
Perform the subtraction 10012-11102 using 1's complement method of subtraction.
2.
Convert 3816 hexadecimal number to binary.
3.
Convert the BCD number 00011000 to decimal number.
4.
Write the truth table of 3-input OR gate.
5.
Give the functional difference between a NAND gate and a negative OR gate.
6.
Construct a truth table for the given Boolean expression AB+BC.
7.
Give the comparison between synchronous & Asynchronous sequential circuits.
8.
Determine the resolution of the output from a DAC that has a 12-bit input.
9.
What is the difference between static RAM and dynamic RAM?
10. Draw the logic diagram for SR latch using two NOR gates.
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SECTION-B
11. Using the Boolean Algebra, simplify the expression:
A A AB ABC
12. Use a Karnaugh map to simplify the function to its minimum sum of product form:
X ABC D ABC D ABC D ACD ABC D
13. Design a Excess-3 to BCD code converter using minimum number of NAND gates.
14. Explain the operation of master-slave J-K flip flop. Give its advantages.
15. Design a 4-bit asynchronous up/down counter and explain its working with the help of
timing diagram.
SECTION-C
16. Simplify using K-map
f(ABCD) = M(l,3,5,7,8,9,l0,13,15) and implement using NAND/NOR logic.
17. a) Explain how a 4-bit R/2R register DAC works?
b) Design and working of a synchronous MOD- 6 counter using JK FF.
18. Write short notes on any two :
a) PLA
b) Ring Counter
c) BCD to 7 segment decoder
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021