Question

The circuit given below represents which of the logic operations?

• A. NOT
• B. AND
• C. OR
• D. NOR

Answer 1

Answer: (B)

Let two inputs are $A$ and $B$. The circuit can be shown as

The two gates shown are NAND gates.
The output of gate $1,Y_1=\overline{A.B}$
The output of gate $2,Y=\overline{Y_1.Y_1}$
or $Y=\overline{\overline{A.B}.\overline{A.B}}=\overline{\overline{A.B}}=A.B$
Thus, the combination behaves as an AND gate.