# Practice Questions on Digital circuits

 Q1. The circuit shown below is a 4-bit SIPO right shift register loaded with 1011.  If clock pulses are applied continuously, then the number of clock pulses required to give 0111 is:
 A. 6 B. 5 C. 3 D. 2

 Q2. How many prime implicants are there in SOP representation of the function $f(ABCD)=\sum (0,1,2,3,6,7,9,13,14,15)$
 A. 2 B. 3 C. 5 D. 6

 Q3. Simplified expression for the following will be: \begin{align*} [1+A.\overline{B}+\overline{A}.B].[(A+\overline{B}).(\overline{A}.B)+\overline{A}.\overline{B}(A+B) \end{align*}
 A. 1 B. 0 C. AB D. A+B

 Q4. The output Y of the combinational circuit is:
 A. $\overline D+\overline A .BC$ B. $C(\overline D+\overline A .BD)$ C. $\overline C( \overline D+\overline A .B$ D. $\overline C(\overline B+\overline A .BD)$

 Q5. In the sequence generator given below the counter status $Q_A, Q_B, Q_C$ is initially 000. The clock has a frequency of 20 MHz and transitions take place at the positive clock edge. The value of $Q_A, Q_B, Q_C$ after 5 pulses will be:
 A. 100 B. 111 C. 011 D. 101

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