Digital electronics miscellaneous

Digital electronics miscellaneous

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Digital Electronics

Digital electronics miscellaneous
  1. Sequential circuits contains—








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    Sequential circuit contains at least one memory element.

    Correct Option: B

    Sequential circuit contains at least one memory element.

  1. The characteristic equation of an SR flip-flop is given by—








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    The characteristic equation of SR flip-flop is given by Qn+1 = S + RQn

    Correct Option: C

    The characteristic equation of SR flip-flop is given by Qn+1 = S + RQn

  1. Assume that only the X and Y logic inputs are available and their complements X and Y are not available. What is the minimum number of two input NAND gates required to implement X ⊕ Y?








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    Let the function be F
    F = X ⊕ Y = XY + YX
    This require four NAND gates to implement. Implementation is shown below.


    Correct Option: C

    Let the function be F
    F = X ⊕ Y = XY + YX
    This require four NAND gates to implement. Implementation is shown below.


  1. Which of the following statement is not correct?








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    Given X + XY = X
    But X + XU = X + U
    Hence option (A) is not correct.
    X ( X + Y) = XX + XY = XY → correct
    X + XY = X (1 + Y) = X → correct
    ZX + ZXY = Z [X + Y] = ZX + ZY → correct

    Correct Option: A

    Given X + XY = X
    But X + XU = X + U
    Hence option (A) is not correct.
    X ( X + Y) = XX + XY = XY → correct
    X + XY = X (1 + Y) = X → correct
    ZX + ZXY = Z [X + Y] = ZX + ZY → correct

  1. Mark the incorrect statement—








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    NA

    Correct Option: A

    NA