Question

The circuit given below represents which of the logical operations?

• A. AND
• B. NOT
• C. OR
• D. NOR

Answer 1

The correct option is A AND

The circuit can be shown as in figure
The two gates shown are NAND gates
The output of first gate $Y_1=\overline{A.B}$
The output of second gate $Y=\overline{Y_1.Y_1}=\overline{\overline{A.B}.\overline{A.B}}=\overline{\overline{A.B}}=A.B$
Thus the given combination behaves as an AND gate.