Exam Questions Papers - Engineering

Q1:

Figure below shows D type Flip-Flops connected as shift register, then outputs QD, QC, QB, QA are given by:

A 1 and 2 only

B 2 and 3 only

C 1, 2 and 3

D none of these

ANS:D - none of these

Here DA = QD ⊕ QC; DB = QA; DC = QB; DD = QC For the given input string, outputs are QD, QC, QB, QA. Therefore right most bit is QA and left most bit is QD. Now we determine the string sequence according to the above mentioned equations. (i) (ii) (iii)