Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (EEE)- Electrical And Electronics Engineering 2020 December 4th Sem 57103 Digital Electronics Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.T ech. (EE) (2012 Onwards) / (Electrical & Electronics Engg.) (2011 Onwards)
B.T ech. (Electronics & Electrical Engg./ Electrical Engineering & Industrial
Control) (2012 to 2017 ) (Sem.?4)
DIGITAL ELECTRONICS
Subject Code : BTEC-404
M.Code : 57103
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
Answer briefly :
1)
Convert the following numbers to octal :
i) (365)16
ii) (22.64)10
iii) (11011.1100)2
iv) (101)2
2)
Convert the following gray code to binary, i) 100101 ii) 11111
3)
State DeMorgan's First theorem
4)
What is meant by Latch?
5)
Define the following terms regarding a logic family :
i) Noise Margin
ii) Propagation delay
6)
Draw the truth table of T Flip flop.
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7)
Which of the following language can describe the hardware?
8)
Why do we need HDL?
9)
What are the facts of behavioral description?
10) What are the file processing tasks in VHDL? Name them.
SECTION-B
11) What are the different types of codes used in digital systems? Explain them.
12) Implement the following Boolean function using 8:1 multiplexer.
f ( ,
A
,
B C, D) ABD ABC BCD ACD
13) Compare the flash type, successive approximation and dual slope A/D converters.
14) How does an edge triggered JK FF avoid race around condition?
15) What is the difference between synchronous and asynchronous counter?
SECTION-C
16) Find the minimal expression for the following function using Quine-McCluskey method.
f ( ,
A B,C, D)
m
0,1,4,6,8,9,10,12 d 5,7,14
17) A combinational circuit is defined by the function
1
F ( ,
A B, C,)
m
4,5,7
2
F ( ,
A B, C,)
m
3,5,7
Implement this circuit with a PLA having 3 inputs, 3 product terms and 2 outputs.
18) Compare the performance of TTL, CMOs and ECL logic.
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