Exam Questions Paper - ECE Questions and Answers

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Figure below shows D type Flip-Flops connected as shift register, then outputs Q_D, Q_C, Q_B, Q_A are given by:

1 and 2 only

2 and 3 only

1, 2 and 3

none of these

Answer : Option D

Explanation :

Here D_A = Q_D ⊕ Q_C; D_B = Q_A; D_C = Q_B;

D_D = Q_C

For the given input string, outputs are Q_D, Q_C, Q_B, Q_A.

Therefore right most bit is Q_A and left most bit is Q_D.

Now we determine the string sequence according to the above mentioned equations.