Electronic Devices Question 272

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 $



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