## Download Question Paper of "Digital Electronics Fundamentals 2 BSC(IT)" , Question Paper of BSC(IT) 2nd Semester, Subject Code : BS-102, Paper ID B0405, Paper 4

• Tuesday, June 28, 2016

Roll  No...................
Total  No.  of  Questions  :  07
B.Sc.(IT)  (Sem.–2nd)
DIGITAL   ELECTRONICS   FUNDAMENTALS
Subject  Code  :  BS-102
Paper  ID  :  [B0405]
Time  :  3  Hrs.
INSTRUCTION  TO  CANDIDATES  :
1. SECTION-A  is  COMPULSORY  consisting  of  TEN  questions  carrying TWO  marks  each.
2. SECTION-B  contains  SIX  questions carrying  TEN marks  each  and  students has  to  attempt  any  FOUR  questions.

SECTION-A

i. Find the  2's complement of 10111000 using the alternative method.
ii. Convert the following binary number to hexadecimal.
1100101001010111
iii. Convert the following Boolean expression to sum of product form :
( A + B ) + C .
iv. Prove  that A(A+B) = A.
v. X  =  1010100 Y  =  1000011.
Find X – Y using 2's complement.
vi. What  is  the  difference between  sequential circuit  and  combinational circuit?
vii. Define D type flip flop and draw the truth table.
viii. Draw  the block diagram of clocked SR flip flop  with  preset and  clear logic.
ix. Write the  steps  for transferring a new word to  be stored into memory.
x. What  is  the  difference  between  single  error  correction  and  double
error correction?
SECTION-B

2.    Explain  ROM  with  its  block  diagram.  Draw  the  Internal  logic  of 32*8 ROM  and its  truth table. 10

3.    Construct a 16*1 multiplexer with two 8*1 and one 2*1 multiplexer using block diagram. 10

4.    What  is  decoder?  Draw  block  diagram  of  3  to  8  line  decoder  with enable. 10

5.    a) Simplify the Boolean function using K-Map.

F  (  w,x,y,z)  =  ∑   (0,1,2,4,5,6,8,9,12,13,14) 5

b) Convert the expression  Y = (A+B) (A+C) (B+C)  into standard Product of Sum (POS)  Form. 5

6. a) Draw the block and circuit diagram of master slave JK flip flop. Explain the functionality and race around condition. 5

b) Find the complement of the function :
F1  =  x’yz’  +  x’y’z  and  F2  =  x(y’z’  +  yz)  by  using  DeMorgan’s theorem. 5

7.    a) Explain the working of 4 bit universal shift register with diagram.

b) Explain the 4 bit ring counter. Draw the block diagram and truth

table.