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   

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Digital Electronincs Question Paper of 3rd Semester IT(D) Download Previous Years Question Paper 4

S.B. Roll no. __________

DIGITAL ELECTRONINCS

3^rd Exam/Comp/0262/May’10

Duration: 3 hrs

Section –A

1.      

a.     No. of binary bits to represent a digital of octal no _______

b.     Radix of octal no is _______

c.      A+B +C= D represents a ______ gage

d.     Statement of commutative law is ____

e.      Demuitiplexer is used to route data from ____ to ____ outputs

f.       EEPROM stands for ____

g.     S-R flip flop do not allow input as S = _____ and R = ______

h.     The layout of TTL gate is about __

i.       The range of number which can be stored in an eight bit register _____ to _______

j.       The data word of 4 bits is known as _____

Section –B

2.      

a.     Write down the difference between Anologanel digital signal.

b.     Simplify the following using Beelean Algebra

A= XY +XZ+XYZ (XY+5)

c.      Draw the symbol and truth table of AND gate.

d.     Definition of SSI, MSI, LSI and VLSI.

e.      Explain the concept of parity.

AB+AC+ABC(AB+C)

f.       Write down the application of A/D and D/A converter.

Section –C

Note: Attempt any three questions

3.     Explain the working of universal shift register. Draw the circuit diagram?

4.     Draw and explain the working of a mod – 10 decade counter using J-K flip-flops.

5.     Explain the working principle of J-K master/ slae flip flop and draw its truth table.

6.     Write short note on

a.     NAND as universal gate

b.     NOR as universal gate  

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

S.B. Roll no. __________

DIGITAL ELECTRONINCS

3^rd Exam/Comp/6240/May’08

Duration: 3 hrs

Section –A

1.                 Do as directed:

a.                 TTL is stands for ________

b.                 1’s compliment of 11101 is ______

c.                  A+A = _______

d.                 AB +BA represents _________ gate.

e.                  An inverter is also called __________ gate.

f.                   ASCII stands for ______

g.                 Race around condition occurs in _____ flip flop

h.                 LCD display consumes less power than LED display (T/F)

i.                   BCD code is weighted code (T/F)

j.                   Counter is a sequential circuit consists of series of flip flop (T/F)

Section –B

          Note: Attempt any five questions.

2.                          

a.                 What are digital and analog signals? Give advantages of digital signals.

b.                 What is half adder, draw its truth table and logic diagram

c.                  Convert

i.                        (110101)2 to decimal equivalent

ii.                        (562.3)10 to octal

iii.                        11011 to excess -3 code.

d.                 List various types of display devices.

e.                  Explain the difference between latch and flip flop

f.                   What are AND, or and NOT gates. Draw its truth table, logic symbol and explain.

g.                 Give application of D/A converter.

h.                 What is universal shift register explain.

Section –C

          Note: Attempt any three questions

3.                  

a.                 What is combinational and sequential circuits, differentiate it.

b.                 What is seven segment display. draw logic expression and diagram

4.                 Explain the following

a.                 Half subtractor

b.                  4.1 multiplexer

5.                 What is race around condition? How it can be stare, explain with circuit diagram

6.                 Draw K-map of f= ∑(0,1,4,5,7,8,9,12,13,15)

7.                 Explain successive approximation D/A converter

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Digital Electronincs Question Paper of 3rd Semester IT(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

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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)

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