1988
1.
For the circuit shown below, the
output F is given by
2.
Minimum number of 2 input NAND gates
required to implement the function given below is
a.
3
b.
4
c.
5
d.
6
1989
1.
Indicate which of the following
logic gates can be used to realized all possible combinational logic functions
:
a.
OR gates only
b.
NAND gates only
c.
EX-OR gates only
d.
NOR gates only
1993
1.
For the logic circuit shown in
figure, the output Y is equal to
Answer: B
2.
Boolean expression for the output of
XNOR logic gate with inputs A and B is
a.
AB’ + A’B
b.
(AB)’ + AB
c.
(A’ + B)(A + B’)
d.
(A’ + B’)(A + B)
Answer: C
1994
1.
The output of a logic gate is ‘1’
when all its inputs are at logic ‘0’. The gate is either
a.
a NAND or an EX-OR gate
b.
a NOT or an EX-NOR gate
c.
an OR r an EX-NOR gate
d.
an AND or an EX-OR gate
Answer: B
1995
1.
The output of the circuit shown in
figure is equal to
Answer: B
2.
The minimum number of NAND gates
required to implement the Boolean function
A + AB’ + AB’C is equal to
a.
Zero
b.
1
c.
4
d.
7
Answer: A
1997
1.
The output of the logic gate shown
is
a.
0
b.
1
c.
A
d.
A’
1998
1.
The minimum number of 2 input NAND
gates required to implement the Boolean function Z = AB’C, assuming that A, B
and C are available, is
a.
Two
b.
Three
c.
Five
d.
Six
Answer: C
2000
1.
For the logic circuit shown in the
figure, the required input combination (A,B,C) to make the output X = 1 is
a.
1, 0, 1
b.
0, 0, 1
c.
1, 1, 1
d.
0, 1, 1
Answer: D
2.
For the logic circuit shown, the
simplified Boolean expression for the output Y is
a.
A + B + C
b.
A
c.
B
d.
C
Answer: C
2001
1.
In the figure, the LED
a.
Emits light when both S1
and S2 are closed.
b.
Emits light when both S1
and S2 are open.
c.
Emits light when only of S1
or S2 is closed.
d.
Does not emit light, irrespective of
the switch positions.
Answer: D
2002
1.
If the input to the digital circuit
of the figure, consisting of a cascade of 20 XOR gates is X, then the output Y
is equal to
Answer: B
Solution : https://www.youtube.com/watch?v=iRCfbhzqgOQ
2008
1.
The logic function implemented by
the following circuit at the terminal OUT is
a.
P NOR Q
b.
P NAND Q
c.
P OR Q
d.
P AND Q
Answer: D
2.
Which of the following Boolean expression
correctly represents the relation between P, Q, R and M1?
Answer: D
2010
1.
Match the logic gates in Column A
with their equivalents in Column B.
a.
P – 2, Q – 4, R – 1, S – 3
b.
P – 4, Q – 2, R – 1, S – 3
c.
P – 2, Q – 4, R – 3, S – 1
d.
P – 4, Q – 2, R – 3, S – 1
Answer: D
2.
For the output F to be 1 in the
logic circuit shown, the input combination should be
a.
A = 1, B = 1, C = 0
b.
A = 1, B = 0, C = 0
c.
A = 0, B = 1, C = 0
d.
A = 0, B = 0, C = 1
Answer: D
Solution : https://www.youtube.com/watch?v=pQAOPtOwtBk
2011
1.
The output Y in the circuit below is
always ‘1’, when
a.
Two or more of the inputs P,Q, R are
‘0’
b.
Two or more of the inputs P,Q, R are
‘1’
c.
Any odd number of the inputs P,Q,R
is ‘0’
d.
Any odd number of the inputs P,Q,R
is ‘1’
Answer: B
2014
1.
The output F in the digital logic
circuit shown in the figure is
Solution : https://www.youtube.com/watch?v=cIpdKO6C078
2.
In the circuit shown in the figure,
if C = 0, the expression for Y is
Answer: A
Solution : https://www.youtube.com/watch?v=zVTaxNYq03A
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