Question 149: Semiconductors and Logic Gates

Question

To get output 1 at R, for the given logic gate circuit the input values must be

Accepted Answer

P = $$\overline x  + $$ y
Q = $$\overline {\overline y .x} $$ = y + $$\overline x $$
Output, R = $$\overline {P + Q} $$
To make R = 1
$$\overline {P + Q} $$ should be = 1
$$ 	herefore $$ P + Q must be 0
$$ 	herefore $$ ($$\overline x  + $$ y) + (y + $$\overline x $$) = 0
Now by checking each option you can see
When y = 0 and x = 1 then
$$\overline x  + $$ y = 0
$$ 	herefore $$ ($$\overline x  + $$ y) + (y + $$\overline x $$) = 0

Answer

x = 0,  y = 0

Answer

x = 1,  y = 0

Answer

x = 0,  y = 1

Answer

x = 1,  y = 1

Semiconductors and Logic Gates

To get output 1 at R, for the given logic gate circuit the input values must be

Choose the correct answer: