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JEE Main 2023 (30 Jan, Shift 1) · Logic Gates

Logic Gates question from JEE Main 2023 (30 Jan, Shift 1)

Q106JEE Main 2023 · 30 JAN · SHIFT 1Medium

Logic Gates

The output waveform of the given logical circuit for the following inputs A and B as shown below, is:

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Answer: (d)

NAND with joined inputs is NOT, so $Y = \overline{\bar{A}\,\bar{B}} = A + B$ (OR).
$A$ is high for $t_1$ – $t_3$ and $t_5$ – $t_6$ ; $B$ is high for $t_2$ – $t_4$ and after $t_6$ .
Both are low only before $t_1$ and between $t_4$ and $t_5$ , so $Y=0$ there and $Y=1$ elsewhere.
So the answer is (d).

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