Question

The given electrical network is equivalent to

• A. AND gate
• B. OR gate
• C. NOR gate
• D. NOT gate

Answer 1

Answer: (C)

Output at NOR gate $Y_1=\overline{A+B}$
The output of first NOR gate is input to the second NOR gate, so the output of second NOR gate is
$Y_2=\overline{Y_1+Y_1}=\overline{Y_1}=\overline{\overline{A+B}}=A+B$
The output of NOT gate is $Y=\overline{Y_2}=\overline{A+B}$
The given electrical network becomes equivalent to the NOR gate.