What logic function is performed by the circuit shown below?
A.  Ring counter 
B.  Ripple counter 
C.  Full adder 
D.  Half adder 
Option: D Explanation :
Here total 7 NAND gates are present and in half adder one AND and one EXOR gate are required. Click on Discuss to view users comments. wdw said: (5:41am on Monday 6th January 2014)
Option D is Correct

What is the Boolean expression for the following circuit?
A.  F(A, B) = ( A + B' ) . ( B + A' ) 
B.  F( A, B ) = 1 ( Tautology ) 
C.  F( A, B ) = ⊕ ( inconsistency) 
D.  F ( A, B ) = A ⊕ B ( A exclusive OR'ed with B) 
Option: A Explanation :
Ans is A as input to 1st OR gate is A, and B' so output of 1st OR gate is (A+B') Click on Discuss to view users comments. 
In the circuit shown below, which logic function does this circuit generate?
A.  AND 
B.  NOR 
C.  NAND 
D.  OR 
Option: D Explanation : Click on Discuss to view users comments. 