question_answer

Which of the following logic gates is a universal gate?

A) OR       

B)               NOT

C) AND                            

D) NAND

Correct Answer: D

Solution :

The NAND gate and the NOR gate can be said to be universal gates since combinations of these can be used to accomplish any of the basic operations and can thus produce an invert, an OR gate or an AND gate. The non-inverting gates do not have this versatility since they can?t produce an invert. Note: The basic symbol and truth table of NAND gate are shown.