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JEE Main & Advanced Physics Semiconducting Devices Question Bank Critical Thinking

  • question_answer
    The shows two NAND gates followed by a NOR gate. The system is equivalent to the following logic gate

    A)             OR

    B)             AND

    C)             NAND

    D)             None of these

    Correct Answer: B

    Solution :

                       The truth table of the circuit is given
    A B C \[\bar{Y}\] \[P=\bar{X}+Y\] \[R=\overline{P+Q}\]
    0 0 0 1 1 0
    1 0 0 1 1 0
    0 0 1 1 1 0
    1 0 1 1 1 0
    0 1 0 1 1 0
    1 1 0 0 1 0
    0 1 1 1 0 0
    1 1 1 0 0 1
    Output Z of single three input gate is that of AND gate.


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