Digital Electronincs Question Paper of 3rd Semester IT(D) Download Previous Years Question Paper 5

S.B. Roll no. __________

DIGITAL ELECTRONINCS

3^rd Exam/IT/Comp/6240/May’10

Duration: 3 hrs

Section –A

1.                 Do as directed:

a.                 A +AB = ________

b.                 In K-map on octet eliminates ________ variables.

c.                  CMOS has the lowest power consumption(T/F)

d.                 LCD stands for _____

e.                  In a seven segment display, segments ‘b’ and ‘c’ are lit. the number displayed is _________

f.                   A  multiplexer changes _________ data into _________data.

g.                 In JK master slave flip-flop ________ condition does not occur.

h.                 A flip flop is memory element(T/F)

i.                   ROM  is a _______ memory.

j.                   Analog to digital conversion involves _____error.

Section –B

Note: Attempt any five questions

2.                   

a.                 Convert the following

i.                        (15359)₁₀=(?)₁₆

ii.                        (F329)₁₆ =(?)₂

b.                 Simplify the following using Boolean laws

i.                        Y =ABC+AB(A C)

ii.                        Y = AB +A +AB

c.                  Explain the  following characteristics of TTL family. Delay noise margin power dissipation fan-in speed logic - levels

d.                 Compare weighted and non weighted codes

e.                  Explain the operation of RS latch using NOR gates

f.                   Differentiate between a latch and a flip flop  

g.                 Explain the operation and design of 8.1 Mux

h.                 Differentiate between RPOM and EPROM.

Section –C

Note: Attempt any three questions

3.   Explain the Totem pole output circuit operation for a TTL NAND gate. Also gives merits and         

    demerits.

4.   What is race around condition in JK flip flop? Discuss now it can be avoided using master slave Jk flip flop using relevant timing diagram.

5.                 Explain the operation of universal shift register using suitable example.

6.                 Discuss the operation of dual slope ADC

7.                 Write short note on any two

a.                 4 bit adder 7 subtract or

b.                 Tristate buffer register

c.                  Static and dynamic RAM