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

 View Ans

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

 View Ans

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

 View Ans

Q4.

The output Y of the combinational circuit is:

A.

$\overline D+\overline A .BC$

B.

$ C(\overline D+\overline A .BD)$

C.

$\overline D+\overline A .B$

D.

$\overline C(\overline B+\overline A .BD)$

 View Ans

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.

001

D.

101

 View Ans


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