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  4. For which one of the following input combinations, the given logic circuit gives the output Y = 1 ?

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Q. For which one of the following input combinations, the given logic circuit gives the output $Y = 1$ ?Physics Question Image

KEAMKEAM 2015Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

The logic circuit is
image
The output,
$Y=\overline{\overline{\bar{A}} \cdot B}+\overline{\bar{C}}=\overline{\overline{\bar{A}} \cdot \bar{B} \cdot \bar{C}}=\bar{A} \cdot B \cdot C$
$[\overline{A+B}=\bar{A} \cdot \bar{B}$, Demorgan's law]
when $A=0, B=1, C=1$, then $Y=1[\because \bar{A}=1]$