Question

The output is low when either of the input is high, then this represents which of the following gates?

• A. OR
• B. NOR
• C. AND
• D. NAND

Answer 1

Answer: (B)

NOR

Answer 2

NOR gate is universal gate. The NOT-OR operation is known as the NOR operation. Figure shows an $N$ input $(N \geq 2)$ OR gate followed by a NOT gate. The operation of this circuit can be described in the following way. The output of the OR gate $Y$ can be written As $Y=A+B+\ldots+N$...(i) and the output of the NOT gate $(Y)$ can be written using $Y=\bar{Y}=\overline{A+B+\ldots \ldots+N}$...(ii) The logic operation represented by E (ii) is known as the NOR operation. or Table gives the truth table of a $2$-input NOR gate. It indicates when either of input is high, the output is low.