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## Download Question Paper of "digital circuits and logic design 2" , Question Paper of BCA (D) 2nd Semester, Subject Code : BC- 205, Paper ID A0210, Paper 1

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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      (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 Minterms & 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 a shift register? What are the various configuration of shift register?
n.     Differentiate between synchronous & asynchronous logical circuits.
o.     Explain the operation of master- save 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,D)= (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 examples.
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.