question_answer

The circuit given below represents which of the logic operations?

A) AND   

B)                                       NOT                      

C)       OR                         

D)       NOR

Correct Answer: A

Solution :

Let two inputs are A and B. The circuit can be shown as: The two gates shown are NAND gates. The output of gate \[-1,{{Y}_{1}}=\overline{A.B}\] The output of gate \[-2,Y=\overline{{{Y}_{1}}.{{Y}_{1}}}\] or          \[Y=\overline{\overline{A.B}.\overline{A.B}}\] \[=\overline{\overline{A.B}}\] \[=A.B\] Thus, the combination behaves as it is an AND gate.