question_answer

Which logic gate is represented by thefollowing combination of logic gates?

A)  OR                                        

B)  NOR

C)  AND                                     

D)  NAND

Correct Answer: C

Solution :

                 Output of gate-1, \[{{Y}_{1}}=\bar{A}\] output of gate-2,   \[{{Y}_{2}}=\bar{B}\] output of gate 3 \[Y=\overline{{{Y}_{1}}+{{Y}_{2}}}=\overline{\bar{A}+\bar{B}}=\bar{\bar{A}}\,\bar{\bar{B}}=AB\] which is the output of AND gate.