Home / ECE / Exam Questions Paper :: Discussion

Discussion :: Exam Questions Paper

  1. Figure shows four D type FFs are connected as a shift register using an XOR gate. The initial state and 3 subsequent states for 3 clock pulses are also given


    The state QA QB QC QD after the 4th clock pulse is

  2. A.
    0000
    B.
    1111
    C.
    1001
    D.
    1000

    View Answer

    Workspace

    Answer : Option D

    Explanation :

    After the 3rd pulse FF3 is 0 and FF4 is 1, so that XOR output is 1 which is fed to DA.

    So, QA = 1, QA to QB → 0

    AB to AC → 0, QC → QD → 0.


Be The First To Comment