Question

Input waveforms $A$ and $B$ as shown in Fig-I are applied to the combination of gates as shown in Fig-II. Which of the waveforms shown in Fig. (i) to (iv) correctly represents the output waveform?

• A. Fig.(i)
• B. Fig.(ii)
• C. Fig.(iii)
• D. Fig. (iv)

Answer 1

Answer: (C)

$Y=\overset{̄}{A}+\overset{̄}{B}$

So, output is 'zero' when both inputs are 'one'. In all other cases output is one.