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Monday, June 27, 2016






Roll No......................
Total No. Of Questtions:13
Paper ID [ A0210]
BCA (205)(S05)(O) (Sem.-2nd)
DIGITAL CIRCUITS AND LOGIC DESIGN
Time : 03 Hrs.
Instruction to Candidates:
1.     Section – A is Compulsory
2.     Attempt any Nine questions from Section – B

SECTION – A
1.       
a.     Convert 40 from decimal to octal number.
b.     Convert DF from hex to decimal number.
c.      What are Minterms and Maxterms?
d.     What is a combinational circuit?
e.      What is a half – adder?
f.       What is a flip-flop?
g.     What is an asynchronous input ?
h.     What is a shift register?
i.       Subtract 101 from 1011 using2’s complement.
j.       Subtract 1101 from 1111 using 1’s complement.
k.     What is an error correcting code?
l.       What is an encoder?
m.  What are universal gate?
n.     What is a T flip- flop?
o.     What is positive logic?

Section – B

2.     Enumerate the features of Hamming code.

3.     Explain SOP and POS function with examples.

4.    Using  De – Morgan’s  Laws  converts the NAND  function Y= (AB) ‘ into  NOR      function.

5.     Explain the essential features of the Karnaugh Map. What are their advantages and      disadvantages?

6.          Discuss the features of the Quine – Mccluskey method.

7.         What is multiplexer? Construct a 64- to 1 multiplexer using 4*1 MUX.

8.         Draw an S-R flip- flop using NOR  gates and develop its truth table.

9.        Compare between synchronous and asynchronous counters.

10.    What is the race – around problem, and how is it rectified?

11.    Discuss the various types of shift registers and their applications.

12.     Discuss the Master Slave JK flip flop with the help of suitable block diagram.


13.   What is an up down counter? Design an updown counter which counts from 0 to 9.

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