Question

The circuit given below represents which of logic operations?

• A. AND
• B. NOT
• C. OR
• D. NOR

Answer 1

Answer: (A)

AND

Answer 2

Let two inputs are $A$ and $B$. The circuit can be shown as : The two gates shown are NAND gates. The output of gate $-1, Y _{1}=\overline{ A \cdot B }$ The output of gate $-2, Y =\overline{ Y _{1} \cdot Y _{1}}$ or $Y =\overline{\overline{ A \cdot B } \cdot \overline{ A \cdot B }}$ $=\overline{\overline{ A \cdot B }}$ $= A \cdot B$ Thus, the combination behaves as it is an AND gate.