# Digital Logic - Combinational Circuits

46:

Which one of the following logic expression is incorrect?

 A. 1 ⊕ 0 = 1 B. 1 ⊕ 1 ⊕ 0 = 1 C. 1 ⊕ 1 ⊕ 1 = 1 D. 1 ⊕ 1 = 0 Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Mahvish said: (3:28pm on Thursday 19th October 2017) With the formulaA ex-OR B = A'B AB' Write your comments here:
47:

The circuit shown in the figure is equivalent to?

 A. B. C. D. Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. wdw said: (11:20pm on Monday 6th January 2014) Please Explain how ? Write your comments here:
48:

The black box in the following figure consists of a minimum complexity circuit that uses only AND,OR and NOT gates. The function f (x,y,z) = 1 whenever x , y are different and 0 otherwise. In addition the 3 inputs x,y,z are never all the same value. Which of the following equation lead to the correct design for the minimum complexity circuit?

 A. x'y + xy' B. x + y'z C. x'y'z' + xy'z D. xy + y'z + z' Answer Report Discuss Option: A Explanation : Click on Discuss to view users comments. rehan said: (1:41am on Sunday 1st March 2015) A part not contain the value of Z so how it full fill the function ????????? Write your comments here:
49:

If A ⊕ B = C, then

 A. A ⊕ C = B B. B ⊕ C = A C. A ⊕ B ⊕ C = 0 D. Both (a) & (b) Answer Report Discuss Option: D Explanation : Mathematically, XOR is both associative and commutative ie.   If C = A  XOR  B then B = C  XOR  A or  B = A  XOR  C and   and A = B  XOR C   A = C  XOR  B Click on Discuss to view users comments. bikash said: (11:05am on Wednesday 4th September 2013) Option C is also correct bikash said: (11:05am on Wednesday 4th September 2013) Option C is also correct Write your comments here:
50:

To make the following circuit a tautology ? marked box should be
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