For the logic circuit shown, the output waveform at $Y$ is

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Professor PC Thomas Classes · Answer

(d) : $Y=\overline{\bar{A} \cdot \bar{B}}=\overline{\bar{A}}+\overline{\bar{B}}=A+B$ The logic circuit behaves as OR gate. \  For $t ightarrow 0$ to $1 ; A=0, B=0$ Therefore, $y=0+0=0$ For $t ightarrow 1$ to $2 ; A=0, B=1$ Therefore, $y=0+1=1$ \ For $t ightarrow 2$ to $3 ; A=1, B=0$ Therefore, $y=1+0=1$ For $t ightarrow 3$ onwards; $A=1 B=1$ Therefore, $y=1+1=1$ The output wave form is shown below.