Question

In the circuit shown in the figure, identify the equivalent gate of the circuit and make its truth table.

Answer 1

`Y = overline(A'.B') = overline(A') +overline(B') = A+B = `

Truth table

A	B	`A' =overline(A.A)`	`B' =overline(B.B)`	`Y' =overline(A'.B')`
0	0	1	1	0
0	1	1	0	1
1	0	0	1	1
1	1	0	0	1

Thus the equivalent gate is OR gate.