Question

Which logic gate is represented by the following combination of logic gates?

• A. OR
• B. NAND
• C. AND
• D. NOR

Hint:

In logic circuits, a NAND gate is the combination of a NOT gate followed by an AND gate. It produces the inverse of the AND operation.

Answer 1

The Correct Option is B

In the given circuit diagram, we have two logic gates:
1. The first gate is a NOT gate, which inverts the input signal. The input \( A \) is passed through the NOT gate, so the output is \( \overline{A} \).
2. The second gate is an AND gate, which takes the output of the first NOT gate (\( \overline{A} \)) and the input \( B \) and produces the output \( \overline{A} \cdot B \). Now, considering the logic gates in sequence: - The first logic gate inverts \( A \), so it is a NOT gate. - The second logic gate combines the output of the first NOT gate and input \( B \) using an AND operation.
Thus, this combination of gates produces the same output as a NAND gate, which is the inverse of an AND gate. Therefore, the correct answer is: \[ \text{(B) } \text{NAND} \]