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Question 85

Which of the following Boolean expression correctly represents the logic circuit diagram ?

Which of the following Boolean expression correctly represents the logic circuit diagram ? Circuit: A and B feed a NOR gate; C and D feed a second NOR gate; the outputs of both NOR gates feed an AND gate, whose output is the circuit output.
  1. A(A+B) . (C+D)
  2. B(A . B)' + (C . D)'
  3. CA . B + C . D
  4. D(A+B)' . (C+D)'
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Correct answer: (D) (A+B)' . (C+D)'

Explanation

The NOR gates give (A+B)' and (C+D)', and the AND gate combines them, so the output is (A+B)' · (C+D)'.

From DSSSB TGT Computer Science Practice Set 2

This is question 85 of DSSSB TGT Computer Science Practice Set 2. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.