A) A B Y 0 0 0 0 1 0 1 0 0 1 1 1
B) A B Y 0 0 1 0 0 1 1 0 1 1 1 0
C) A B Y 0 0 1 0 1 0 1 0 0 1 1 0
D) A B Y 0 0 0 0 1 1 1 1 1
Correct Answer: D
Solution :
Key Idea: Gates-I and II are NOR gates. We can simplify the gate circuit as Here, gates-I and II are NOR gates. The output \[(\overline{A+B})\] of gate-I will be appeared as input of gate-II. The final output is \[Y=\overline{\overline{A+B}}\,=A+B\] This is he Boolean expression of OR gate whose truth table is given below:A | B | Y |
0 | 0 | 0 |
0 | 1 | 1 |
1 | 0 | 1 |
1 | 1 | 1 |
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