Download Question Paper of "Digital Circuits and Logic Designs 2" , Question Paper of BCA 2nd Semester, Subject Code : BSBC - 205, Paper ID 802091, Paper 10

Roll No. .............

Total No. of Questions : 07

BCA (Sem. – 2nd)

DIGITAL CIRCTITS AND LOGIC DESIGN

SUBJECT QODE : BC-205 (S05)

Paper ID : [80209]

[Note : Please fill subject code and paper ID on OMR]

Time : 03 Hours

Instruction to Candidates:

1) Section - A is Compulsory.

2) Attempt any Four questions from Section - B.

Section - A

1)       

a.     Convert  (i)  11011.11 (binary number ) to decimal number.

               (ii) 7825.6875 decimal number to octal.

b.     Convert  (i)  125.89 binary number to BCD number.

               (ii) A4F to Octal number.

c.      Simplify

                     ____   ____

                    (a+b)+(a+b)

d.     Prove using truth table

                           A +AB = A+B

e.      Draw the logic diagram & truth table of Full adder.

f.       Define the term propagation Delay.

g.     Simply the following logic function using k- map and find the minterm & maxterms.

                      F(X,Y,Z)= XZ+XYZ+YZ

h.     Write the truth table of 3:8 Decoder.

i.       State & prove the De- Margin theorems.

j.       What do you mean by race around condition?

k.     Explain the term LOCKOUT with the help of a suitable example?

l.       What is the difference between Latch and a flip- flop?

m.  What is shift register? what are the various configurations of shift register?

n.     Differentiate between synchronous & asynchronous logical circuits.

o.     Explain the operation of master-Slave flip-flop?

Section –B

2)    What do you mean by error detecting and correcting codes? Explain  both with the help of suitable examples.

3)    Obtain the truth table of the following & implement it by using NAND Gates?

                  F(A,B,C)=(AB+BC)(AC+BC)

4)    Minimize the following Using K-Map and Realize It with NAND Gates?

          F(A,B,C,D)=∑m(2,3,4,5,13,15)+ ∑d(8,9,10,11)

5)    Implement BCD to Excess-3 Code converter?

6)    Explain the following terms with help of suitable example:

a.     HAZARDS.

b.     RACES.

7)    Implement following using 4X16 Decoder.

                     F=X Y +Z

8)    What  do you mean by Multiplexer. Draw the block diagram and logical diagram of 4:1 Multiplexer.

9)    Design a synchronous counter using JK flip flop for the following sequence ?              

                      000,101,110,111,011,010,000

10)                  Explain the term universal shift register.

11)                 Classify the counters and Discuss the BCD counters. Also explain ring counters.

12)                 Explain the various rules of K-Map reduction technique.

13)                 Give any five differences between combinational & sequential logical circuits.