Download PTU (Punjab Technical University) BSc IT (BCA) 2nd Semester 72727 DIGITAL CIRCUITS and LOGIC DESIGNS Last 10 Years 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011 and 2010 Previous Question Papers.
Roll No. Total No. of Pages : 02
Total No. of Questions : 07
B.Sc.(IT) (2015 & Onward) (Sem.?2)
DIGITAL CIRCUITS & LOGIC DESIGNS
Subject Code : BSIT-204
M.Code : 72727
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains SIX questions carrying TEN marks each and students have
to attempt any FOUR questions.
SECTION-A
1) Answer briefly :
a) When will be NAND gate output low? Write complete table.
b) What is the Binary equivalent of the decimal number 368?
c) What is the Decimal Equivalent of Hex number 1A53?
d) Convert (9B2 - 1A) H to its decimal equivalent.
e) What is difference between latch and flip-flop?
f) What is a Multiplexer?
g) Given the two binary numbers X=1010100 and Y=1000011, perform the subtraction
X-Y, Y-X using l's complement.
h) State the commutative property of Boolean algebra.
i) Prove that ABC + ABC? + AB?C + A?BC = AB + AC + BC
j) State the limitations of Karnaugh Map.
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1 | M- 72727 (S3)-2195
Roll No. Total No. of Pages : 02
Total No. of Questions : 07
B.Sc.(IT) (2015 & Onward) (Sem.?2)
DIGITAL CIRCUITS & LOGIC DESIGNS
Subject Code : BSIT-204
M.Code : 72727
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains SIX questions carrying TEN marks each and students have
to attempt any FOUR questions.
SECTION-A
1) Answer briefly :
a) When will be NAND gate output low? Write complete table.
b) What is the Binary equivalent of the decimal number 368?
c) What is the Decimal Equivalent of Hex number 1A53?
d) Convert (9B2 - 1A) H to its decimal equivalent.
e) What is difference between latch and flip-flop?
f) What is a Multiplexer?
g) Given the two binary numbers X=1010100 and Y=1000011, perform the subtraction
X-Y, Y-X using l's complement.
h) State the commutative property of Boolean algebra.
i) Prove that ABC + ABC? + AB?C + A?BC = AB + AC + BC
j) State the limitations of Karnaugh Map.
2 | M- 72727 (S3)-2195
SECTION-B
2. What is a Logic gate? Give the classification of logic families. Which gates are called as
the universal gates? What are its advantages?
3. a) Explain about Boolean expression. Simplify the Boolean expression
F = C(B + C)(A + B + C).
b) Explain SOP and POS forms in detail.
4. What is K-map? Simplify the following expression into sum of products using Karnaugh
map
F(A,B,C,D) = ? (1,3,4,5, 6, 7, 9, 12, 13).
5. Explain Flip Flop. Show how a JK flip-flop can be constructed using a T flip-flop and
other logic gates.
6. What is a Counter? What is the difference between Asynchronous counter and
Synchronous counter?
7. What is the working of multiplexer and demultiplexer? What are their applications and
advantages?
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 07 December 2019