The two combinations of NAND gates shown in the figure are equivalent to (i) (ii)

The two combinations of NAND gates shown in the figure are equivalent to (i)
(ii)

1. (i)-Or gate, (ii)-AND gate
2. (i)-AND gate, (ii)-NOT gate
3. (i)-NOT gate, (ii)-AND gate
4. (i)-AND gate, (ii)-OR gate

Solution

The output of combination of NAND gate shown in circuit diagram (i) is given as
$ \begin{aligned} & C=\overline{\bar{A} \cdot \bar{B}}=\overline{\bar{A}}+\overline{\bar{B}} \quad[\because \overline{x \cdot y}=\bar{x}+\bar{y}] \\ & C=A+B=\text { Output of OR gate } \end{aligned} $ The output of combination of NAND gate shown in circuit diagram (ii) is given as Fig. (ii) $C=\overline{\overline{A B}}=A B=$ Output of AND gate

Asked in: AP EAMCET 2020 (22 Sep Shift 2)

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