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WorksheetsCombinational Logic Circuits
Total questions: 20
Worksheet time: 10mins
The device shown here is most likely a ________
a) Comparator
b) Multiplexer
c) Inverter
d) Demultiplexer
What type of logic circuit is represented by the figure shown below?
a) XOR
b) XNOR
c) AND
d) XAND
A Full adder adds
2 bits
3 bits
4 bits
more than 4 bits
Convert binary to octal: (110110001010)2
A) (5512)8
B) (6612)8
C)(4532)8
D)(130)10
Binary coded decimal is a combination of
A) 2 Binary Digits
B) 3s Binary Digits
C)4 Binary Digits
D)5 Binary Digits
For the device shown here, let all D inputs be LOW, both S inputs be HIGH, and the EN' input be HIGH. What is the status of the Y output?
low
HIGH
HIGH IMPEDANCE
DONT CARE
2'S Complement of 1110101010100001010
0001010101011110110
0001010101011110101
0001010101011110100
1101010101011110110
(48)10 - (22)10 = ()2
1011010
0011001
0011010
0011011
AB+A’C+BC=
AB+A’C'
AB+A’C
AB+AC'
AB'+A’C'
110 IS REPRESENTED AS IN SOP & IN POS FORM ABC’=m6 A’+B’+C=M6
AB'C’=m6 A’+B+C=M6
A'BC’=m6 A+B’+C=M6
ABC’=m7 A’+B+C=M6
ABC’=m6 A’+B’+C=M6
THE SOP EQUATION FOR F(A,B,C)= ∑ m(1,2,4,7) IS
Y=A’B’C+ A’BC’+AB’C’+AB
Y=A’B’C+ A’BC’+AB’C’+ABC
Y=A’B’C'+ A’BC’+AB’C’+ABC
Y=A’B’C+ A’BC’+A'B’C’+A'BC
Y=(A+B+C)(A+B’+C’)(A’+B+C’)(A’+B’+C) IS EQUIVALENT TO
F(A,B,C)=∏ M(0,3,5,6)
F(A,B,C)=∏ M(0,3,7,8)
F(A,B,C)=∏ M(0,3,9,4
F(A,B,C)=∏ M(0,1,3,6)
SOP EQUATION IS
Y+Z
X'+Z
Z'+X'
Z'+Y
SOP EQUATION FOR THIS IS
WY+YZ
W'Y'+Y'Z'
W'Y'+Y'Z'
W'Y'+YZ
A n bit parallel adder requires full adders to perform the operation.
n
n+1
n-1
n2
A parallel binary subtractor performs subtraction using
decimal rules
2"s complement method
1's complement method
nines complement method
In the given 4-to-1 multiplexer, if c1 = 1 and c0 = 0 then the output M is
X0
X2
X3
X1
How many select lines would be required for an 8-line-to-1-line multiplexer?
2
3
4
5
The word Demultiplexer means
a) One into one
b) both a & c
c) Many into one
d)One into many
Fig shows Truth Table for active ------enable & active -------- output.
low, high
high, low
low, low
high,high
