## Digital Electronics Question Paper of 3rd Semester CSE(D) Download Previous Years Question Paper 1

• Monday, September 05, 2016

S.B. Roll no. __________
DIGITAL ELECTRONINCS
3rd Exam/Comp/6240/Dec’08
Duration: 3 hrs
Section –A
1.     Do as directed:
a.     Number of nibbles in a byte are ___________
b.     How many flip flops are required for MOD 64 counter _______
c.      2* complement of 10000 is ____________
d.     State De- Morgan’s theorem
e.      Name any one IC for universal gate
f.       In K-map pair eliminates ___________ variable.
g.     _________ logic families has maximum fan out.
h.     Define resolution
i.       The number of address lines required for 1 k byte memory is __________
j.       Register is a combinational circuit (T/F)\
Section –B
Note: Attempt any five questions.
2.
a.     Compare analog  and digital system.
b.     What is full adder explain with logic circuit and truth table.
c.      What are the performance characteristic of A/D converter.
d.     Simplify the following expression using Boolean algebra Y=AB+A+AB
e.      Define SSI, MSI, LSI, VLSI
f.       Explain seven segment display.
g.     Perform following
i.      (96)10= (x)2 = (x)8 =(x)1€
ii.      Binary 100000 to gray code.

Section –B

Note: Attempt any three questions.

3.     Explain JK flip flop with its logic circuit, truth table. Convert it to D and T flip flop.

4.     Simplify using K- map and implement it by NAND gate only
If(A,B,C,D) = ∑(0,1,4,5,7,8,9,12,13,15)

5.      What is shift register? Explain universal shift register.

6.     Write short note on any two

a.     Decode counter
b.     A/D converter
c.      Memories (RAM & ROM)

North India Campus