Question

The output of a logic gate is '1' when all its inputs are at logic '0'. The gate is either

• A. a NAND or an EX-OR gate
• B. an NOR or an EX-NOR gate
• C. an OR or an EX-NOR gate
• D. an AND or an EX-OR gate

Answer 1

The correct option is B an NOR or an EX-NOR gate

NOR gate $\Rightarrow F=\overline{A+B}=\overline{A}.\overline{B}$

EX-NOR gate $\Rightarrow F=A⨀B=\overline{A}.\overline{B}+AB$