question_answer

The output Y, when all the three inputs a first high and then low, will respectively bf

A)  1, 0                       

B)  1, 1    

C)  0, 0                       

D)  0, 1

E)  1, -1

Correct Answer: D

Solution :

                Let inputs A, B and C are given to circuits As gate-I is AND and Gate-II is NAND Output    \[Y=\overline{A.\,B.\,C}\] when  \[A=1,\]\[B=1\]and \[C=1,\] \[Y=\overline{(1.1).\,\,1}=\bar{1}=0\] when  \[A=0,\]\[B=0\]and \[C=0,\]then \[Y=\overline{(0\,.\,0)\,.\,\,0}=\bar{0}=1\]