Question

You are given two circuits as shown in figure, which consists of NAND gates. Identify the logic operation carried out by the two circuits.

Answer 1

(a) Split the gate `:`

C is the output of AND gate 1 and input of NOT gate 1,D is the output of NOT gate 1and input of AND gate 2, E is the output of AND gate 2,Y is finally output
Truth table `:`

So,this logic operation is AND gate .
(b)
C is the output of AND gate 1
D is the output of AND gate 2.
E is the output of NOT gate 1
F is the output of NOT gate 2
G is the output of AND gate 3 and input of NOT gate 3.
Here, it is same as OR gate. A and B are inputs and Y is output.

So, this logic operation resembles to OR gate.