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ISRO | ISRO CS 2008 | Question 25

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  • Difficulty Level : Hard
  • Last Updated : 20 Nov, 2018
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The logic operations of two combinational circuits in Figure-I and Figure-II are

(A) entirely different
(B) identical
(C) complementary
(D) dual

Answer: (A)

Explanation: The Two functions are entirely different as:

Figure 1: The logic gates derive the following function:

F1 = ((X + Y')' + X)'
   = ((X + Y')')'. X'
   = (X + Y'). X'
   = XX' + X'Y'
   = X'Y'

Figure 2: It is simple AND gate which has 1 input already complimented.

F2 = XY'

So, these two functions are entirely different.

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