Question

In a given circuit as shown, the two input waveforms A and B are applied simultaneously. The resultant waveform Y is

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

(1=high, 0=low)
Input to A is in the sequence 1, 0, 1, 0.
Input to B is in the sequence 1, 0, 0, 1.

Sequence is inverted by NOT gate.

Thus, input to OR gate becomes 0, 1, 0, 1 and 0, 1, 1, 0 respectively.

Since for OR gate 0+0=0 or 0+1=1 or 1+1=1, output of OR gate becomes 0, 1, 1, 1. Hence choice (a) is correct