Roll No. ...........................
Total No.
of Questions : 13]
PAPER ID[A0305]
B.Sc. (IT/DCA-201)(SEM.-2nd)
DIGITAL ELECTRONICS
Time : 03 Hours
Instruction to Candidates:
1)
Section - A is Compulsory.
2)
Attempt any Nine questions from Section - B.
Section - A
Q1)
i. Convert
Hex BSC to binary.
ii.
Add
binary numbers: 1101 + 1001 + 1111.
iii.
Convert
decimal 100. 5 to binary.
iv. What
do you mean by minterm and maxterm?
v.
Write
De-Morgan’s theorem.
vi.
Draw
the symbol of a 4 input NAND gate and 3-input
vii.
What
is the role of a half adder and half subtractor?
viii.
What
do you mean by combinational circuits? Give exa
ix.
Where
do we use MUX and DEMUX?
x.
Write
the truth table of half adder and draw its circuit.
xi.
What
are the various types of Flip Flop?
xii.
Where
do we use Flip Flop and memories?
xiii.
How
Register constitute a memory?
xiv.
Explain
what do you mean by Main and Secondary me
xv.
Where
do we use D-Flip Flop and clocked Flip Flops?
SECTION –B
2. If
X=1101.110 and y = 1001.101(both in binary) Find x+ y and x-y( by2’s
complement
method).
3. Convert
hex Cf 8.7 to binary, octal and decimal system.
4. simplify
the following function by K-map:
a)
F(A ,B,C) =∑(0,2,3,4,6)
B) XY
+YZ+XY’Z
5) simplify the following expression in (a)
S-O-P and (b) P-O-S:
X’
z’+ y’ z +z y ’+x y
6)
write the truth table of a Full adder
and then from it derive the circuit in terms of half adders.
7)
Draw the circuit of a 2 to 4 decoder
and explain its function.
8)
Explain how 3 to 8 decoder function can be obtained
from a demultiplexer(1 to 8)
9)
draw the symbols and write the truth
tables of the various logic gates you have studied
10)
draw the circuit of an S-R flip flop
using NAND gates only from it derive the
circuit of a D-flip flop and explain its truth table.
11) How can you realize the edge triggered J-K
flip flop from an S-R flip flop? Write the truth table of J-K flip flop an
explain how race – around problem can be solved in it.
12)
Explain the difference between the
following memories:
a)
Volatile
and Non – volatile
b)
Static
and dynamic
c)
Sequential
and random access.
d)
Magnetic
and semiconductor.
13) Discuss:
a)
Classification
of memories.
b)
Basic
memory structure
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