## 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 3

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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.
2) Attempt any Four questions from Section–B.

Section –A
1.     Write a short note on:
a.     Define 2’s complement of a binary number.
b.     State the basic  laws governing simplification using K-map.
d.     Give truth table of Ex-NOR  gate.
e.      Difference between MUX and DEMUX.
f.       To add two 4 bit binary number, how many Half Adders and full adders are needed?
g.     Write any three applications of flip flops.
h.     Compare SOP and POS forms.
i.       What is memory cell?
j.       What do you mean by term “ random Access” with reference to memories.

Section –B
2.     Convert:
a.     153.53 from decimal to octal.
b.     2B.C4 from hexadecimal to decimal.
c.      2AB from hexadecimal to binary.
d.     545 from octal to hexadecimal
e.      127.54 from octal to decimal.

3.     What are Universal gates? Realize various logic gates using Universal gates only.

4.     Explain Full Adder. Give design of a Full adder. Realize a full adder using NAND gates only.

5.
a.     Simplify: F= AB +A (b+c) + B(B+C)

b.     Simplify using K- Map : F(w,x,y,z)=∑(01,2,4,5,6,8,9,12,13,14)

6.     Discuss in detail classification and characteristics of memories.

7.     How can you realize edge triggered JK flip flop from an SR flip flop? Give its truth table and explain how race around problem is removed in it?