Digital Electronincs Question Paper of 3rd Semester IT(D) Download Previous Years Question Paper 1

S.B. Roll no. __________

DIGITAL ELECTRONINCS

3^rd 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)