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JEE Main & Advanced Physics Semiconducting Devices Question Bank Digital Electronics

  • question_answer
    For the given combination of gates, if the logic states of inputs A, B, C are as follows A = B = C = 0 and A = B = 1, C = 0 then the logic states of output\[D\]are                                                                                                            [AMU 1998]

    A)            0, 0

    B)            0, 1 

    C)            1, 0

    D)            1, 1

    Correct Answer: D

    Solution :

                       The output D for the given combination                    \[D=\overline{(A+B).C}=\overline{(A+B)}+\bar{C}\]                    If \[A=B=C=0\]then \[D=\overline{(0+0)}+\bar{0}=\bar{0}+\bar{0}=1+1=1\]                    If \[A=B=1\],\[C=0\]then \[D=\overline{(1+1)}+\bar{0}=\bar{1}+\bar{0}=0+1=1\]


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