Official PYQ · 2015Set 1 · Q37Plane Waves and PropertiesNAT2 marks

GATE EC 2015 Set 1 Q37 — Plane Waves and Properties

All the logic gates shown in the figure have a propagation delay of $20$ ns. Let $A=C=0$ and $B=1$ until time $t=0$ . At $t=0$ , all the inputs flip (i.e., $A=C=1$ and $B=0$ ) and remain in that state. For $t>0$ , output $Z=1$ for a duration (in ns) of ________.

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Answer: 40:40

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Published 10 Oct 2026

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