Question

What is an equivalent gate for the following circuit?

• A. XOR gate
• B. NAND gate
• C. AND gate
• D. NOR gate

Answer 1

The correct option is C AND gate

For the given circuit, input $A$ and $B$ become $\overline{A}\text{and}\overline{B}$ due to NOT gate, and the output $Y$ has one more NOT gate making OR gate output as, $\overline{Y}=\overline{\overline{A}+\overline{B}}=A\cdot B$ (AND gate).

So, the equivalent gate of for $\overline{Y}=\overline{\overline{A}+\overline{B}}$ is an AND gate.

Hence $\left(D\right)$ is the correct answer.

Why this Question? Application: The conversion of an OR gate into an AND gate using DeMorgan's law.