The given electrical network is equivalent to :

• A

  OR gate
• Correct answer
  B

  NOR gate
• C

  NOT gate
• D

  AND gate

Solution

$Y_1=\overline{A+B}$

$Y_2=\overline{Y_1+Y_1}=\overline{Y_1}=A+B$

$Y=\overline{Y_2}=\overline{A+B}$ i.e., NOR gate

Hence, the correct answer is option: 'B'.