Digital Electronics Question Paper of 3rd Semester CSE(D) Download Previous Years Question Paper 2

S.B. Roll no. __________

DIGITAL ELECTRONINCS

3^rd Exam/Comp/6240/Dec’07

Duration: 3 hrs

Section –A

1.     Do as directed:

a.     ASCII code is of ________ bits.

b.     NAND gate is combination of _____ and ______ gates.

c.      A+  A = ______

d.     CMOS stands for ___________

e.      EEPROM stands for ____________

f.       Grey code is weighted code(T/F)

g.     Flip flop is a trustable circuit  (T/F)

h.     A/D converter is based on successive approximation principle(T/F)

i.       LCD display consumes less power than LED display.

Section –B

Note: Attempt any five questions

2.      

a.     What is full adder, draw its truth table and logic diagram

b.     What are universal gates? Explain.

c.      What is ROM, explain different types of ROM

d.     What is 1’s and 2’s compliment , give example of each.

e.      What is decoder? Explain 3.8 de coder.

f.       Explain differentiate between sequential and combination circuit

g.     Explain the following:

                                                             i.      Power dissipation

                                                           ii.      fan in, fan out

Section –C

          Note: Attempt any three questions

3.     what is multiplexer and DE multiplexer? Discuss 8:1 multiplexer with diagram

4.     discuss master slave flip flop and explain and explain its working and use.

5.      

a.     Using karnajgh map, simplify the following F1 = ∑m = (0,2,4,8,9,10,11,12,13)

b.     Explain seven segment display.

6.     Explain the working of dual slope ABC