Question

The gate is either _________

(a) A NAND or an EX-OR

(b) An OR or an EX-NOR

(c) An AND or an EX-OR

(d) A NOR or an EX-NOR

I got this question during an online interview.

The question is from Logic Gates and Networks topic in section Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

Answer 1

The correct option is (d) A NOR or an EX-NOR

To explain I would say: The output of a logic gate is 1 when all inputs are at logic 0. The gate is NOR. The output of a logic gate is 1 when all inputs are at logic 0 or all inputs are at logic 1, then it is EX-NOR. (The truth tables for NOR and EX-NOR Gates are shown in the above table).