Physics - Semiconductors Question with Solution | TestHub

Output of the first gate (NOR gate) is $Y_1=\overline{A+B}$.

The second gate is a NAND gate with both inputs connected together, which acts as a NOT gate. Its output is $Y_2=\overline{Y_1}=\overline{\overline{A+B}}=A+B$.

The third gate is a NOT gate. Its output is $Y=\overline{Y_2}=\overline{A+B}$.

The final output $Y=\overline{A+B}$ represents a NOR gate.

Answer: NOR gate