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NCERT Class XII Chapter
Semiconductor Electronics
Questions With Solutions

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Question : 17
Total: 19
You are given two circuits as shown in figure which consist of NAND gates. Identify the logic operation carried out by the two circuits.

Solution:  
(a) Let us find Boolean expression for given logic circuit
so, output Y = {
––––––––––––
−
AB
.
−
AB
} =
––––––
––––
AB
 = AB
hence logic circuit operates as AND gate.

(b) By De-Morgan’s theorem
(
−
−
A
−
B
 =
−
−
A
+
−
−
B
) = A + B

so, the given logic circuit acts as OR gate.
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