Question

The logic gate represented in following figure is

• A. OR Gate
• B. NOT Gate
• C. NAND Gate
• D. XOR Gate

Answer 1

Answer: (A)

Truth table of this gate

A	B	Y'	Y
0	0	1	0
1	0	0	1
0	1	0	1
1	1	0	1

$Y^{\prime }=\overline{A+B}=\bar{A}\times \bar{B}$
and $Y={\bar{Y}}^{\prime }=\overline{\bar{A}\times \bar{B}}=\overline{\stackrel{ˉ}{A}}+\overline{\stackrel{ˉ}{B}}=A+B$
This is the boolean expression for the OR gate.