Question

The circuit as shown in figure, the equivalent gate is

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

Answer 1

Answer: (A)

Let the outputs of individual gates be labelled as X, Y and Z respectively starting from left to right. we have:

$Z=\overline{Y}Y=\overline{XX}=\overline{X}+\overline{X}=\overline{X}X=\overline{A+B}\Rightarrow Z=X=\overline{A+B}$.

Thus, the combination behaves as NOR gate.