Semiconducting Devices Question 74
Question: For the given combination of gates, if the logic states of inputs A, B, C are as follows A = B = C = 0 and A = B = 1, C = 0 then the logic states of output $ D $ are
[AMU 1998]
Options:
A) 0, 0
B) 0, 1
C) 1, 0
D) 1, 1
Show Answer
Answer:
Correct Answer: D
Solution:
The output D for the given combination
$ D=\overline{(A+B).C}=\overline{(A+B)}+\bar{C} $
If $ A=B=C=0 $ then $ D=\overline{(0+0)}+\bar{0}=\bar{0}+\bar{0}=1+1=1 $
If $ A=B=1 $ , $ C=0 $ then
$ D=\overline{(1+1)}+\bar{0}=\bar{1}+\bar{0}=0+1=1 $
