Question

 Identify the equivalent gate for the following circuit and write its truth table.

Answer 1

Output,`Y=overline(A'+B')`

Here A′ ≡ Output of A from NOT gate, = `overlineA`

B′ ≡ Output of B from NOT gate, = `overlineB`

Thus, Output `Y=overline(A'+B')`

                           `=overlineA'*overlineB'`

                            =`A*B`

So, the equivalent gate for the given circuit is AND GATE.

Truth Table

A	B	Y = A · B
0	0	0
0	1	0
1	0	0
1	1	1