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Monday, May 30, 2016

Roll No. .............
Total No. of Questions : 07
BCA (Sem. – 2nd)
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
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
                     ____   ____
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?
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 ?              
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.



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