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Digital Electronics and Digital Instruments Course Code: 3340904

GTU/ NITTTR Bhopal/13-14 Gujarat State

GUJARAT TECHNOLOGICAL UNIVERSITY, AHMEDABAD, GUJARAT

COURSE CURRICULUM

COURSE TITLE: DIGITAL ELECTRONICS AND DIGITAL INSTRUMENTS

(Code: 3340904)

Diploma Programmes in which this course is offered Semester in which offered

Electrical Engineering 4th

semester

1. RATIONALE

Digital electronics has invaded all branches of engineering and electrical engineering in

particular. Hence it is essential that the diploma electrical engineer have a sound

understanding of the basic fundamentals of digital electronics. Similarly digital instruments

are replacing the analog instruments. Therefore, this course has been designed so that basic

skills to operate and maintain the basic digital circuits and digital instruments are developed

in the students.

2. COMPETENCY

The course content should be taught and implemented with the aim to develop different types

of skills so that students are able to acquire following competency:

Maintain digital electronic circuits and instruments.

3. COURSE OUTCOMES

The theory should be taught and practical should be carried out in such a manner that students

are able to acquire different learning outcomes in cognitive, psychomotor and affective

domain to demonstrate following course outcomes.

i. Use digital integrated circuit logic family chips.

ii. Perform computational and measurement activities using digital techniques.

iii. Build sequential and combinational logic circuits.

iv. Analyse working of A/D and D/A converters.

v. Use display devices for digital circuits.

vi. Use digital meters for measurements.

4. TEACHING AND EXAMINATION SCHEME

Teaching Scheme

(In Hours)

Total

Credits

(L+T+P)

Examination Scheme

Theory Marks Practical

Marks

Total

Marks

L T P C ESE PA ESE PA

150 4 0 2 6 70 30 20 30

Legends: L-Lecture; T – Tutorial/Teacher Guided Theory Practice; P - Practical; C – Credit ESE - End

Semester Examination; PA - Progressive Assessment.



5. COURSE DETAILS

Unit Major Learning Outcomes (in cognitive domain)

Topics and Sub-topics

Unit – I

Number

Systems

1a. Convert numbers from

one to another system

1b. Perform binary

arithmetical operations.

1c. Explain various types of

binary codes and its

applications.

1.1Types of number system, inter conversion

1.2 Basic mathematical operations – 1’s

complement,2’s complement, 9s

complement and 10’s complement

1.3 Binary addition, subtraction,

multiplication and division.

1.4 Introductions to codes –Binary, weighted

,non weighted codes, Excess code, Grey

code, BCD code, Hamming code (only

introduction)

Unit– II

Logic Gates

And Wave

Shaping

Circuits

2a. Use of Diode as Wave

shaping circuit with the

output waveforms of the

clipper circuit.

2.1 Diode and transistor as a switch.

2.2 Diode as a clipper circuit

2b. Differentiate different

logic levels

2c.Prepare the truth table of

various logic gates.

2d. Develop basic gates

using Universal gates

2.3 Positive logic and negative logic levels

2.4 Different types of logic gates, symbol and

truth table

2.5 Universal gates - NAND and NOR

2e. State the features of

various logic families

2.6 Logic family RTL, DTL

2.7 NMOS, PMOS and CMOS

Unit– III

Boolean

Algebra and

Combinational

Circuits

3a.Apply laws of Boolean

algebra

3b.State the need for

Demorgan’s theorems.

3.1 Laws of Boolean algebra.

3.2 Demorgan’s theorems.

3c.Build logic circuit for a

given Boolean expression

3d.Build various

combinational circuits.

3e.Describe the working of 3

to 8 decoder and BCD to

Seven segment decoder

3.3 Boolean expression and logic diagram

and vice versa

3.4 Simplification of given Boolean equation.

3.5 Combinational circuits: Half and Full

Adder, half and full Subtractor,

Multiplexer and Demultiplexer Encoder

and Decoder

Unit- IV

Sequential

Circuits

4a.Explain the working of

various Flip Flops with

the help of truth table.

4.1Flip-Flop (FF) circuits: R-S, D, J-K and

master slave J-K.

4b.Describe the working of

various types of shift

generator.

4.2Shift register: series, parallel left and

right

4c.Draw the waveform of

Asynchronous and

Synchronous counter

counters

4.3Asynchronous and Synchronous counter

using 7493 and 7490

4d. Select various 4.4 Introduction of Semiconductor memory



Unit Major Learning Outcomes (in cognitive domain)

Topics and Sub-topics

semiconductor memories RAM, ROM, PROM, EPROM and EEPROM

Unit-V

A to D And D

to A

Convertors and

Display Devices

5a.Describe the working of

various types of A to D

convertors.

5b.Describe the working of

various types of and D to

A convertors.

5.1 Digital to Analog conversion.

Weighted Resistor Network type

Binary Ladder Network type

5.2 Analog to Digital conversion

Parallel Comparator type

Successive approximation type

Counter OR Staircase type

5c.Explain working of

various display devices

used with digital circuits.

5.3 Display devices

Mechanical Drum or Disc type

Light Emitting Diode type

Liquid Crystal Display

Unit-VI

Digital

Instruments

6a. State the features of

digital over analog

instruments.

6.1 Comparison of digital instrument with

analog instrument.

6b.Draw the block diagram

of digital instruments and

explain each block.

6.2 Basic building blocks of -digital

instruments.

6c. Explain the working of

various Digital

instruments

6.3 Digital volt-meter - Ramp and Staircase

type

6.4 Digital frequency meter, multi meter,

Digital watt meter, Digital energy meter

6. SUGGESTED SPECIFICATION TABLE WITH HOURS AND MARKS (THEORY)

Unit

No.

Unit Title Teaching

Hours

Distribution of Theory Marks

R

Level

U

Level

A

Level

Total

Marks

I Number Systems 8 2 4 4 10

II Logic Gates and Wave shaping

Circuits 11 4 4 6 14

III Boolean Algebra And

Combinational Circuits 12 3 4 8 15

IV Sequential Circuits 11 4 6 4 14 V A to D and D to A Convertors

and Display Devices 8 4 4 2

10

VI Digital Instruments 6 3 3 1 7

Total 56 20 25 25 70

Legends: R = Remember; U = Understand; A = Apply and above levels (Revised Bloom’s taxonomy)

Note: This specification table shall be treated as a general guideline for students and teachers. The actual

distribution of marks in the question paper may vary slightly from above table.

7. SUGGESTED LIST OF EXERCISES/PRACTICAL

The practical/exercises should be properly designed and implemented with an attempt to

develop different types of skills (outcomes in psychomotor and affective domain) so that

students are able to acquire the competencies/programme outcomes. Following is the list of

practical exercises for guidance.



Note: Here only outcomes in psychomotor domain are listed as practical/exercises. However,

if these practical/exercises are completed appropriately, they would also lead to development

of certain outcomes in affective domain which would in turn lead to development of Course

Outcomes related to affective domain. Thus over all development of Programme Outcomes

(as given in a common list at the beginning of curriculum document for this programme)

would be assured.

Faculty should refer to that common list and should ensure that students also acquire

outcomes in affective domain which are required for overall achievement of Programme

Outcomes/Course Outcomes.

8. SUGGESTED LIST OF STUDENT ACTIVITIES

Following is the list of proposed student activities such as:

i. Student may validate the experimental results with that of results obtained using

various simulation soft ware’s.

S.

No. Unit No.

Practical Exercises

(outcomes in psychomotor domain)

Approx

Hrs.

required

1 II Verify the truth table of the different Logic Gates. 2

2 II Build basic Gates using NAND Universal Gate. 2

3 II Build basic Gates using NOR Universal Gate. 2

4 II Build diode positive clipper circuits and observe the output waveform 2

5 II Build diode negative clipper circuits and observe the output waveform. 2

6 III Build and test the logic circuit to prove commutative laws, Associative

laws and Distributive laws. 2

7 III Verify Demorgan’s theorems. 2

8 III Build and test the logic circuit for a given Boolean Expression. 2

9 III Build and test the logic circuit for simplification of a given Boolean

Expression. 2

10 III Build and test Half Adder Circuit. 2

11 III Build and test Full Adder Circuit. 2

12 III Build and test Half Subtractor Circuit. 2

13 III Build and test Full Subtractor Circuit. 2

14 IV Build and test the working of the R-S Flip-Flop for Active High inputs. 2

15 IV Build and verify the truth table of R-S Flip-Flop for Active Low inputs. 2

16 IV Build and verify the truth table of D Flip-Flop. 2

17 IV Build and verify the truth table of JK Flip-Flop. 2

18 IV Build and test the working of the Shift Register. 2

19 IV Build and Test the working of the Decade counter. 2

20 IV Display various alphanumeric characters on BCD and Seven segment

LED Display. 2

21 IV Build/Test the 4 bit Decoder circuit. 2

22 IV Build/Test the 4 bit Encoder circuit. 2

23 V Convert given analog signal to 4 bit Digital output using ADC 2

24 V Convert the given digital signal to analog output using DAC. 2

25 VI Build and Test various digital circuits with the help of simulation

software.

2

Total Hours (Perform any practical worth 28 hours from above depending upon the

availability of resources so that most units are covered) 50



ii. Student may present seminar on a given topic of this subject

iii. Students may develop counters for practical use

9. SPECIAL INSTRUCTIONAL STRATEGIES (IF ANY)

Visit to nearby electronic component manufacturing factories

Display of animation/video films on functioning of digital instruments.

10. SUGGESTED LEARNING RESOURCES

A) List of Books

Sr.

No. Title of Book Author Publication

1. Digital Electronics Sanjay Sharma S.K.Kataria & sons.

2. Digital Electronics Dr.B.R.Gupta &

V.Singhal

S.K.Kataria & sons.

3. Digital Electronics (for

Polytechnics)

Pratima Manhas

Shaveta Thakral

S.K.Kataria & sons.

4.

Trouble shooting &

Maintenance of Electronic

equipments

K. Sudeep singh S.K.Kataria & sons.

5. Digital design : with an

introduction to the verilog hdl

M. Morris Mano,

Michael D. Ciletti

Pearson, 5th

edition.

6. Morden Digital Electronics R P Jain TMH

7. Fundamentals of Digital

circuits

A. Anand Kumar PHI

8. Digital Electronics K. Meena PHI

9.

Digital principles &

applications

Malvino. A. P.,

Leach D. P.,

Saha Goutam

Tata Mcgraw Hill Education

Private Limited (2010), 7th

Edition

10. Pulse digital & switching

wave forms

Millman & Taub Mc. Graw Hill

11. Electronic devices & circuits Allen Mottershed. Prentice Hall of India

12. Principles of digital

electronics

Malvino & Leach Tata Mc. Graw Hill

13. Digital circuits & systems Douglass V. Hall Mc. Graw Hill

B) List of Major Equipment/ Instrument with Broad Specifications

Bread board with connecting wires & various logic input/output facilities

Various Logic Gates, Flip-Flop, Registers, Counters, Encoder, Decoder,

ADC, DAC, Seven Segment Code converter related ICs

Digital Logic trainer board.

A/D and D/A trainer modules.

Universal counter module

Demonstration kit for various display devices

Digital IC tester

Regulated Power Supply

Digital Storage Oscilloscope

Digital Multimeter



Various kits of Digital Voltmeter, Frequency meter, Watt meter, Energy meter.

Digital Function Generators

The Virtual Instrumentation Educational Laboratory Suite specifically for teaching

analog, digital, and power laboratories

C) List of Software/Learning Websites

Matlab 2011a

Psim

Electronics Work Bench

www.nptel.iitm.ac.in

www.ocw.mit.edu

www.slideshare.net/

www.alldatasheet.com

www.nptl.iitm.ac.in

www.ocw.mit.edu

www.slideshare.net

www.authorstream.com

www.daenotes.com

www.youtube.com/nptelhrd

www.Howstuffworks.com

Various Simulation soft ware’s such as Electronics Workbench etc.

11. COURSE CURRICULUM DEVELOPMENT COMMITTEE

Faculty Members from Polytechnics

Prof. S.V. Jagani Lecturer, Govt. Polytechnic Dahod.

Prof J.C. Gadani, Lecturer, C U Shah Govt. Polytechnic Surendranagar.

Prof H.I. Joshi, Lecturer, Govt. Polytechnic, Ahmedabad.

Coordinator and Faculty Members from NITTTR Bhopal

Prof. (Mrs.) C. S. Rajeshwari, Head of Department of Electrical and Electronics

Engineering.

Prof. Joshua Earnest, Professor, Department of Electrical and Electronics

Engineering.

http://www.alldatasheet.com/

http://www.youtube.com/nptelhrd

Laxmi Institute of Technology, Sarigam

Diploma Electrical Engineering Department Academic Year: 2018-19

ASSIGNMENT: 1

Name of Subject : DIGITAL ELECTRONICS AND DIGITAL INSTRUMENTS Date:

Subject Code : 3340904

Chapter/Unit 1: Number Systems

Sr. No. Name of Question Remarks

1. Convert the given decimal numbers into binary numbers (a)256 (b) 210 (C)0.875 (D)15.95

2. Convert the following decimal numbers into octal numbers (a)247 (b) 1406 (C)11.11

3. Convert the following decimal numbers into hexadecimal numbers (a)3558 (b) 6708 (C)4534

4. Convert the following binary numbers into decimal numbers (a) 1100110011 (b)110101.101

5. Convert the following octal numbers into decimal numbers (a) 5507 (b)435.635

6. Convert the following hexadecimal numbers into decimal numbers (a) C67 (b)DE12

7. Convert the following octal numbers into binary numbers (a)65302 (b)3764.67

8. Convert the following binary numbers into octal numbers (a)1111.1011 (b)1110011100.101

9. Convert the following hexadecimal numbers into binary numbers (a)BEC45 (b)98FE.CD

10. Convert the following binary numbers into hexadecimal numbers (a) 11111111.01011 (b)11011111100011

11. Convert the following octal numbers into hexadecimal numbers (a)65442 (b)2653.506

12. Convert the following hexadecimal numbers into octal numbers (a)324.BA (b) 11.11(C)ABCD

13. Perform binary addition (a) (1101011) 2 + (0101101) 2 (b) (0001001) 2 + (0101100) 2

14. (1110001) 2 - (1111011) 2



15. Using 1’s compliment subtract (1101)2 from (0111)2

16. Using 2’s compliment subtract (10110111)2 from (10011101)2

17. Find the 9’s compliment of the following decimal numbers. (a)3465 (b)782.54 (c)4526.075

18. Find the 10’s compliment of the following decimal numbers. (a)4069 (b)1056.074

19. (A)Multiply (101.10)2 by (10.1)2 (B) Obtain the result for (1.01)2 * (10.1)2

20. Perform (1011101)2 ÷ (1010)2

21. Give types of Codes. Explain BCD code Gray code and error correcting code in details.

22. Obtain Excess-3 code for (a) (625)10 (b) (807)10

23. Convert following binary numbers into gray codes (a)101101 (b)011010

24. Convert following gray codes into binary numbers (a)1101 (b)10110010

Date of Submission:-

Name & Sign of Subject In-charge :



ASSIGNMENT: 2



Chapter/Unit 2: Logic Gates And Wave Shaping Circuits


1. Give any four advantages of electronic switch.

2. Explain the working of transistor as a switch.

3. Explain the working of diode as a switch.

4. Draw the symbol and truth table of AND gate, OR gate, NOT gate,NAND Gate , NOR gate , EX-OR Gate & EX-NOR Gate.

5. Draw AND gate and EX-NOR gate with three input and give its truth table.

6. Show that the NAND gate is universal gate.

7. Prove that NOR gate is a universal gate.

8. Explain combined clipper circuit using two diodes.

9. Write four applications of clipper circuit

10. Draw and explain positive biased clipper with necessary waveforms.

11. Give classification of Logic families and briefly explain Diode transistor logic with two input NAND gate with its merits and demerits.

12. Explain propagation delay and noise immunity as parameter of digital IC.

13. Describe transistor - transistor logic with its merits and demerits.



14. Draw and explain NOR gate using RTL logic. Give its advantages and disadvantages.

15. Draw and explain NAND gate using CMOS logic. Give its advantages and disadvantages.

16. Explain the working of CMOS -NOR Gate with the help of diagram and give advantages of CMOS over TTL.





ASSIGNMENT: 3



Chapter/Unit 3: Boolean Algebra and Combinational Circuits


1. Explain properties of Boolean algebra.

2. Simplify using Boolean algebra: AB+A(B+C)+B(B+C)

3.

Show that using Boolean algebra (i) AB + CD = (A+C)(A+D)(B+C)(B+D) _ _ _ (ii) A(A+C)(AB+C) = 0 (iii) A. (A+B) = A

4. Applying laws of Boolean algebra prove that

_ _ _ _ _ _ (i) A + AB + AB = A + B (ii) AB + AB + AB + AB + B = 1

5. Show that using Boolean algebra

(i) (A+B+AB)(A+C) = A+BC (ii) (X+Y)(X+Z) = X+YZ

6.

Prove that (i) (P+Q)(P+R) = P + QR _ (ii) XYZ + XY Z + XZ = XZ (iii) AB +ABC + A’B +AB’C = ( B + C ) ( A + B )

7. Briefly explain the Principle of Duality.

8. Explain De Morgan’s Theorem with the help of Logic circuit and truth table

9. Draw the logic diagram for the given Boolean expressions:

_ _ _ _ _ (i) Y = AD + BCD + BCD (ii) Y= ABC + ABC

10. Draw logic circuit for the Boolean expression :

_ _ _ ABCD + ABCD+ABCD + ABCD.

11. Draw logic circuit for the Boolean expression :

_ _ _ _ Y = (A+B+C).(A B).(ABC)



12. _ _

Draw logic diagram of XY +XY + Z using only NAND gate

13. Draw logic diagram for half adder and full adder and explain with truth table.

14. Draw the logic circuit of Full Subtractor.

15. Draw and briefly explain 2 to 1 multiplexer with logic diagram and truth table

16. Explain the 1 to 8 demultiplexer with the help of block diagram and truth table.

17. What is a Decoder? Draw and explain the logic circuit of 3 to 8 decoder and Write its truth table. Give four applications of decoder in digital system

18. Explain Decimal to BCD Encoder with necessary logic circuit and truth table.





ASSIGNMENT: 4



Chapter/Unit 4: Sequential Circuits


1. What is combinational circuit? Compare combinational circuits and sequential circuit.

2. Explain R-S flip flop using logic circuit and truth table.

3. Write the truth table for D flips flop.

4. Draw the Logic circuit of JK flip flop and briefly explain its working.

5. Explain the race around condition in JK flip flop and list the methods to overcome it.

6. Explain J-K master slave flip-flop with its logic circuit and truth table.

7. List different types of shift registers. Explain shift right type serial-in-serial-out shift register.

8. List any three applications of Shift registers and decoders each.

9. Explain briefly four basic types of shift registers.

10. Explain 4-bit shift left register using J-K flip flop.

11. Draw decade counter and explain reset arrangement. Also Give any four applications of Counters.

12. Explain IC-7490 decade counter.

13. Give classification of RAM and give applications of RAM. Give classification of ROM and give applications of ROM. Compare static RAM with dynamic RAM.





ASSIGNMENT: 5



Chapter/Unit 5: A to D And D to A Convertors and Display Devices


1. Describe advantages and disadvantages of weighted resistor D/A converter.

2. Give specifications of D/A Converters. Explain the term resolution , linearity AND settling time with respect to D/A converter.

3. Draw block diagram of A/D converter. Explain quantization and encoding

4. Explain parallel comparator analog to digital converter

5. Write the advantages and disadvantages of voltage to time conversion type A/D converter

6. State different types of A to D convertor. Explain successive approximation type A to D convertor.

7. Give advantages and disadvantages of LED Display and list any two applications of LED.

8. Explain seven segment LED display

9. Explain common cathode and common anode type LED display with necessary circuit diagram.

10. Explain the construction and working of LCD.

11. Compare LED with LCD.





ASSIGNMENT: 6



Chapter/Unit 6 : Digital Instruments


1. Write advantages of digital instruments over analog instruments.

2. List any four building blocks of Digital Instruments

3. Draw and explain block diagram of digital instruments.

4. Explain the working of Digital frequency meter with the help of Block Diagram and waveforms.

5. Explain ramp type analogue to digital converter digital voltmeter.

6. What is the need of Clock and comparator in Digital Instruments?



DIGITAL ELECTRONICS AND DIGITAL INSTRUMENTS (3340904)

Department of Electrical Engineering Laxmi Institute of Technology, Sarigam(Diploma)

QUESTION BANK

Chapter 1 – Number Systems

1. Convert (1010.11)2 to decimal number.

2. Convert (100)10 to binary number.

3. Multiply (1.01)2 by (10.1)2.

4. Divide (1110100)2 by (111010)2.

5. Add (100101)2 to (110111)2.

6. Subtract (111001)2 from (1110001)2 7. Convert (1035)8 to Decimal number.

8. Convert the given decimal numbers into binary numbers (a) 256 (b) 210

9. Answer the following (a) 73BD + 2A9F (b) (1110001) 2 - (1111011) 2 (c) (28)10 = ( )16 (d) (10110110) 2 = ( ) 16

10. (i) Convert the following decimal numbers into hexadecimal numbers (a) 3558 (b) 6708 (ii) perform binary addition (a) (1101011) 2 + (0101101) 2 (b) (0001001) 2 + (0101100) 2

11. Convert (247)10 in to binary and octal number. 12. Convert (ABCD)16 in to octal number. 13. Multiply (101.10)2 by (10.1)2.

14. Convert (4534)10 in to hexadecimal number 15. Convert (324.BA)16 in octal number. 16. Multiply (101.11)2 by (10.01)2. 17. Convert (15.95)10 in to binary number. 18. Obtain BCD code for (725)10. 19. Obtain the result for (1.01)2 * (10.1)2. 20. Convert (0.875) 10 in to binary number. 21. Convert (BEC45)16 in to binary number. 22. Convert (11.11)10 into hexadecimal and octal. 23. Perform (1011101)2 ÷ (1010)2 24. Obtain the 2’s compliment for (1101). 25. Using 2’s compliment subtract (10110111)2 from (10011101)2. 26. Using 2’s compliment subtract (1101)2 from (0111)2. 27. Give types of Codes. Explain any one in details. 28. Explain BCD code. 29. Explain gray code. 30. Explain error correcting code. 31. State the full form of ASCII 32. Obtain Excess-3 code for (625)10. 33. Convert (101101)gray into binary.

Chapter 2 – Logic Gates And Wave Shaping Circuits

1. Give any four advantages of electronic switch. OR Give advantages of electronic switch.

2. Explain the working of transistor as a switch. 3. Explain the working of diode as a switch. OR

Explain working of PN Junction Diode as switch with switching characteristics 4. Explain positive & negative logic with necessary diagram. 5. Draw the symbol and truth table of NAND Gate & EX-OR Gate 6. Prepare the truth table for AND gate and OR gate with two inputs. 7. Using AND, OR and NOT gate prepare EX-OR gate and its truth table. 8. Draw EX-NOR gate with three input and give its truth table. 9. Drawthe logic circuit of NOR gate, EX- OR gate and OR gate using NAND gate. 10. Draw electrical equivalent circuit of NOT gate. 11. Draw electrical equivalent circuit of AND gate. 12. Show that the NAND gate is universal gate. 13. Prove that NOR gate is a universal gate. 14. Explain the positive clipper circuit with circuit diagram and waveforms. OR

Draw and explain positive biased clipper with necessary waveforms. 15. Draw series negative clipper circuit with necessary i/p, o/p waveforms. 16. Explain combined clipper circuit using two diodes 17. Write four applications of clipper circuit.

18. Give classification of Logic families and briefly explain Diode transistor logic with two input NAND gate.

19. Explain propagation delay and noise immunity as parameter of digital IC. 20. Describe diode transistor logic with its merits and demerits 21. Describe transistor - transistor logic with its merits and demerits. 22. Draw and explain NOR gate using RTL logic. Give its advantages and disadvantages. 23. Draw and explain NAND gate using CMOS logic. Give its advantages and disadvantages. 24. Explain the working of CMOS -NOR Gate with the help of diagram and give advantages of

CMOS over TTL. 25. State the two advantages of CMOS logic family. OR

State the two advantageous features of CMOS logic family.

Chapter 3 – Boolean Algebra and Combinational Circuits

1. Explain properties of Boolean algebra. OR Explain any four properties of Boolean algebra. OR Write any three boolean algebra properties with related boolean expression.

2. Give answers as per Boolean algebra laws. _ _ A+1=___, A.1=___, A+A=___, A.A=___, A+A=___, A.A=___

3. _ _ _ _ Prove A B + AB + AB + AB = 1

4. Prove that A. (A+B) = A 5. Simplify using Boolean algebra: AB+A(B+C)+B(B+C) 6. Show that using Boolean algebra

(i) AB + CD = (A+C)(A+D)(B+C)(B+D) _ _ _ (ii) A(A+C)(AB+C) = 0

7. Applying laws of Boolean algebra prove that _ _ _ _ _ _ (i) A + AB + AB = A + B (ii) AB + AB + AB + AB + B = 1

8. Show that using Boolean algebra (i) (A+B+AB)(A+C) = A+BC (ii) (X+Y)(X+Z) = X+YZ

9. Prove that AB +ABC + A’B +AB’C = ( B + C ) ( A + B ) 10. Prove that (i) (P+Q)(P+R) = P + QR

_ (ii) XYZ + XY Z + XZ = XZ

11. Briefly explain the Principle of Duality. 12. Explain De Morgan’s Theorem with the help of Logic circuit and truth table. OR

Explain the De Morgan’s theorem. OR Write & explain any one DeMorgan’s theorem with diagram and truth table.

13. Write truth table for a given boolean expression. Y= (A+B).(B+C)

14. Draw logic circuit for the given boolean expression. _ _ _ Y= (A.B) + (B.C) + (C.A)

15. Draw the logic diagram for the given Boolean expressions: _ _ _ _ _ (i) Y = AD + BCD + BCD (ii) Y= ABC + ABC

16. Draw logic circuit for the Boolean expression : _ _ _ ABCD + ABCD+ABCD + ABCD.

17. Draw logic circuit for the Boolean expression : _ _ _ _ Y = (A+B+C).(A B).(ABC)

18. _ _ Draw logic diagram of XY +XY + Z using only NAND gate

19. Describe half adder with logic diagram and truth table. OR Describe half adder with logic diagram.

20. Explain full adder circuit with necessary diagram and truth table. OR Draw the logic circuit of full adder and briefly explain its working with truth table

21. Draw logic diagram for half adder and full adder and explain with truth table. OR Explain Half adder with necessary diagram.

22. Explain Half subtractor circuit with necessary diagram. 23. Draw the logic circuit of Full Subtractor 24. Draw and briefly explain 2 to 1 multiplexer with logic diagram and truth table 25. Explain the 1 to 8 demultiplexer with the help of block diagram and truth table. 26. What is a Decoder? Draw and explain the logic circuit of 3 to 8 decoder and Write its truth table. OR

Draw and explain 3 to 8 Decoder logic circuit with its truth table. OR Write short note on 3 to 8 decoder.

27. Give four applications of decoder in digital system. 28. Write short note on BCD to seven segment decoder.

29. Write in brief about encoders. 30. Draw circuit arrangement for decimal to BCD encoder and explain with truth table. OR

Explain Decimal to BCD Encoder with necessary logic circuit and truth table.

Chapter 4 – Sequential Circuits

1. What is combinational circuit? Compare combinational circuits and sequential circuit. OR Compare combinational circuit with sequential circuit.

2. List various types of flip-flop & explain any one with truth table & diagram. 3. Explain R-S flip flop using logic circuit and truth table. OR

Draw the logic circuit of RS flip flop and write its truth table 4. Write the truth table for R-S flip flop without clock pulse. 5. Write the truth table for D flips flop. 6. List various types of shift register & explain any one with diagram. 7. Explain 4 bit shift left register using JK flip flop. 8. Draw the Logic circuit of JK flip flop and briefly explain its working. 9. Explain JK flip flop with logic circuit and truth table. 10. Explain the race around condition in JK flip flop and list the methods to overcome it. 11. Explain race around condition in JK flip flop and show how it is eliminated in master slave JK

flip flop. 12. Explain J-K master slave flip-flop with its logic circuit and truth table. 13. Explain the race around condition in JK flip flop and list the methods to overcome it. 14. List different types of shift registers. Explain shift right type serial-in-serial-out shift register. 15. List any three applications of Shift registers and decoders each. 16. Explain briefly four basic types of shift registers 17. Describe 4 bit shift left register using JK flip flop. OR

Explain 4-bit shift left register using J-K flip flop. 18. Give any four applications of Counters. 19. Draw decade counter and explain r reset arrangement 20. Explain IC-7490 decade counter. 21. Explain decade counter with wave form. OR

Explain decade counter in brief with circuit & waveforms. 22. Give classification & explain in very brief about memory.

23. Give classification of RAM and give difference between static RAM and dynamic RAM. OR List different types of RAM and give applications of RAM. Compare static RAM with dynamic RAM.

24. List & explain in brief types of ROM. 25. Write any two applications of ROM and RAM each. 26. Compare static RAM with dynamic RAM. 27. Explain random access memory with its classification.

Chapter 5 – A to D And D to A Convertors and Display Devices

1. Describe advantages and disadvantages of weighted resistor D/A converter. 2. Give specifications of D/A Converters. Explain the term resolution with respect to D/A converter. OR

Describe the term linearity, resolution and settling time with reference to D/A converter. OR Write short note on specifications of D to A converter.

3. Write analog output for various digital inputs for a 4-bit D to A converter. 4. Draw block diagram of A/D converter. Explain quantization and encoding. OR

Draw the diagram of any one type of A to D converter. 5. Explain parallel comparator analog to digital converter 6. Briefly explain successive approximation A/D Converter with diagram.

Explain the working of successive approximation A/D converter. 7. Write the advantages and disadvantages of voltage to time conversion type A/D converter 8. State different types of A to D convertor. Explain successive approximation type A to D convertor. 9. Give advantages and disadvantages of LED Display and list any two applications of LED. 10. Explain seven segment LED display 11. Explain common anode type seven segment display. 12. Explain common cathode and common anode type LED display with necessary circuit diagram. 13. Explain the construction and working of LCD 14. Compare LED with LCD.

Chapter 6 – Digital Instruments

1. Write advantages of digital instruments over analog instruments. OR Compare Analog & Digital instruments.

2. List any four building blocks of Digital Instruments 3. Draw and explain block diagram of digital instruments. 4. Explain the working of Digital frequency meter with the help of Block Diagram and waveforms. OR

Draw the block diagram of digital frequency meter and name different blocks. OR Draw and explain block diagram of digital frequency meter. OR Draw the block diagram of digital frequency meter and explain working. OR Draw block diagram of Digital Frequency Meter.

5. Explain ramp type analogue to digital converter digital voltmeter 6. What is the need of Clock and comparator in Digital Instruments?

Laxmi Institute of Technology, Sarigam Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmadabad

Academic Year 2018-19 Centre Code:691 Examination : Mid Exam I Semester :IV

Branch :Electrical Date:31.01.2019 Sub Code: 3340904

Sub :D.E.D.I. Time:10.30 AM to 11.30 AM Marks:20 Q-1 Answer any three. 6 1. Convert (15.95)10 in to binary number. 2. Convert (ABCD)16 in to octal number. 3. Perform binary addition (1101011) 2 + (0101101) 2 4. Draw the symbol and truth table of NAND Gate & EX-OR Gate. 5. Give any four advantages of electronic switch Q-2 (A) Give types of Codes. Explain any one in details. 3 OR

(A) (i)Obtain Excess-3 code for (625)10. (ii) Convert (101101)gray into binary.

3

(B) Draw and explain series positive clipper with circuit diagram and necessary waveforms.

3

OR (B) Explain the working of transistor as a switch. 3 Q-3 (A) Using 1’s and 2’s compliment subtract (10110111)2 from (10011101)2. 4 (B) Show that the NAND gate is universal gate. 4 OR (A) Explain the working of diode as a switch. 4 (B) Prove that NOR gate is a universal gate. 4 -૧ કોઈપણ ણના જવાબ લખો ૬

૧. (15.95)10 ને બાયનર નબંરમા ંફરવો. ૨. (ABCD)16 ને ઓ ટલ નબંરમા ંફરવો.

૩. બાઈનર મા સરવાળો કરો (1101011) 2 + (0101101) 2 ૪. NAND ગેટઅને EX-OR ગેટના ચ હ તથા થુ ટબલ દોરો. ૫. ઈલે ોિનક વચના કોઇ ચાર ફાયદાઓ આપો. -૨ (અ) કોડ ના કાર આપો. કોઈ પણ એક કોડ સમ વો. ૩

અથવા (અ) (i) (625)10 માટ એ સેસ-3 કોડ મેળવો. (ii) (101101)gray ે કોડ ને બાયનર મા ંફરવો. ૩

(બ) િસર ઝ પો ઝ ટવ લપર સ રકટ ને ડાયા ામ અને વેવફોમ દોર સમ વો ૩ અથવા (બ) ા ટર ુ ં વચ તર ક કાય સમ વો ૩ -૩

(અ)

1’s અને2’s કો લીમટ નો ઉપયોગ કર ને (10110111)2 ને (10011101)2માથંી બાદ કરો. ૪

(બ) NAND ગેટ િુનવસલ ગેટ છે તે સમ વો. ૪ અથવા (અ) પી. એન . જકંશન ડાયોડ ની વચ તર ક ની કામગીર વ ચગ કર ટ ર ટક દોર સમ વો. ૪

(બ) NOR ગેટ એ િુનવસલ ગેટ છે તે સા બત કરો.

૪

Laxmi Institute of Technology, Sarigam Approved by AICTE, New Delhi; Affiliated to Gujarat Technological University, Ahmadabad

Academic Year 2018-19 Centre Code:691 Examination : Mid Exam I Semester :IV

Branch :Electrical Date: 31.01.2019 Sub Code: 3340904

Sub :D.E.D.I. Time:10.30 AM to 11.30 AM Marks:20 Q-1 Answer any three. 6 1. Convert (15.95)10 in to binary number. 2. Convert (ABCD)16 in to octal number. 3. Perform binary addition (1101011) 2 + (0101101) 2 4. Draw the symbol and truth table of NAND Gate & EX-OR Gate. 5. Give any four advantages of electronic switch Q-2 (A) Give types of Codes. Explain any one in details. 3 OR

(A) (i)Obtain Excess-3 code for (625)10. (ii) Convert (101101)gray into binary.

3

(B) Draw and explain series positive clipper with circuit diagram and necessary waveforms.

3

OR (B) Explain the working of transistor as a switch. 3 Q-3 (A) Using 1’s and 2’s compliment subtract (10110111)2 from (10011101)2. 4 (B) Show that the NAND gate is universal gate. 4 OR (A) Explain the working of diode as a switch. 4 (B) Prove that NOR gate is a universal gate. 4 -૧ કોઈપણ ણના જવાબ લખો ૬

૧. (15.95)10 ને બાયનર નબંરમા ંફરવો. ૨. (ABCD)16 ને ઓ ટલ નબંરમા ંફરવો.

૩. બાઈનર મા સરવાળો કરો (1101011) 2 + (0101101) 2 ૪. NAND ગેટઅને EX-OR ગેટના ચ હ તથા થુ ટબલ દોરો. ૫. ઈલે ોિનક વચના કોઇ ચાર ફાયદાઓ આપો. -૨ (અ) કોડ ના કાર આપો. કોઈ પણ એક કોડ સમ વો. ૩

અથવા (અ) (i) (625)10 માટ એ સેસ-3 કોડ મેળવો. (ii) (101101)gray ે કોડ ને બાયનર મા ંફરવો. ૩

(બ) િસર ઝ પો ઝ ટવ લપર સ રકટ ને ડાયા ામ અને વેવફોમ દોર સમ વો ૩

અથવા

(બ) ા ટર ુ ં વચ તર ક કાય સમ વો ૩ -૩

(અ)

1’s અને2’s કો લીમટ નો ઉપયોગ કર ને (10110111)2 ને (10011101)2માથંી બાદ કરો. ૪

(બ) NAND ગેટ િુનવસલ ગેટ છે તે સમ વો. ૪

અથવા

(અ) પી. એન . જકંશન ડાયોડ ની વચ તર ક ની કામગીર વ ચગ કર ટ ર ટક દોર સમ વો. ૪

(બ) NOR ગેટ એ િુનવસલ ગેટ છે તે સા બત કરો.

૪

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Seat No.: ________ Enrolment No.______________

GUJARAT TECHNOLOGICAL UNIVERSITY DIPLOMA ENGINEERING – SEMESTER –IV• EXAMINATION – SUMMER - 2017

Subject Code: 3340904 Date:03 -05 - 2017

Subject Name: Digital Electronics and Digital Instruments

Time: 10:30 AM TO 01:00 PM Total Marks: 70 Instructions:

1. Attempt all questions.

2. Make Suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

4. Use of programmable & Communication aids are strictly prohibited.

5. Use of only simple calculator is permitted in Mathematics.

6. English version is authentic.

Q.1 Answer any seven out of ten. દશમ ાંથી કોઇપણ સ તન જવ બ આપો. 14

1. Convert (35.15)10 in to binary number.

૧. (35.15)10 ને બ યનરી નાંબર મ ફેરવો.

2. Using 2’s compliment subtract (11001110)2 from (10110111)2.

૨. 2’s કોમ્પ્લીમેંટ ની રીતથી (11001110)2 ને (10110111)2. મ ાંથી બ દ કરો.

3. Convert (124.CD)16 in binary and decimal number.

૩. (124.CD)16 ને બ યનરી અને ડેસીમલ નાંબર મ ફેરવો.

4. Multiply (1111.1)2 by (10.1)2.

૪. (1111.1)2 ને (10.1)2 થી ગણુ ક ર કરો.

5. Divide (10000111)2 by (101)2 . .

૫. (10000111)2 ને (101)2 થી ભ ગો.

6. Prepare the truth table for EX-OR gate with two inputs.

૬. બે ઇનપટુ વ ળ EX-OR gate નુાં ટ્રુથ ટેબલ તૈય ર કરો.

7. State the four basic types of shift register.

૭. શીફ્ટ રજીસ્ટર ન ચ ર મખુ્ય પ્રક ર જણ વો.

8. State the two advantageous features of CMOS logic family.

૮. CMOS લોજીક ફેમીલી ન બે મખુ્ય ફ યદ જણ વો.

9. Write any two applications of ROM and RAM each.

૯. ROM અને RAM ની બ-ેબે ઉપયોગીત લખો,

10. Give four applications of decoder in digital system.

૧૦. ડડજીટલ સસસ્ટમ મ ડીકોડર ની ચ ર ઉપયોગીત લખો,

Q.2 (a) Describe diode transistor logic with its merits and demerits. 03

પ્રશ્ન. ર (અ) ડ યોડ- ટ્ર ન્ઝીસ્ટર લોજીક તેન ફ યદ અને ગેરફ યદ સ થે સમજાવો. ૦૩

OR

(a) Describe propagation delay, noise immunity and threshold voltage as

parameter of digital IC.

03

(અ) પ્રપોગેસન ડીલ,ે નોઇસ ઇમ્પયનુીટી અને થે્રશોલ્ડ વોલ્ટેજ ડડજીટલ આઇ. સી ન પેર મીટર તરીકે સમજાવો.

૦૩

(b) Explain gray code as non-weighted binary code. 03

2/3

(બ) ગે્ર કોડ ને નોન વેઇટેડ બ યનરી કોડ તરીકે સમજાવો. ૦૩

OR

(b) Explain BCD code. 03

(બ) BCD સમજાવો. ૦૩

(c) Explain the working of transistor as a switch. 04

(ક) ટ્ર ન્ઝીસ્ટર નુાં સ્વીચ તરીકે ક યય સમજાવો. ૦૪

OR

(c) Prepare AND, OR, NOR and NOT gate using NAND gate. 04

(ક) NAND ગેટ વ પરીને AND, OR, NOR અને NOT ગેટ તૈય ર કરો. ૦૪

(d) Explain the De Morgan’s theorem. 04

(ડ) De Morgan નુાં થીયરમ સમજાવો. ૦૪

OR

(d) Explain properties of Boolean algebra. 04

(ડ) Boolean algebra ની પ્રોપટી સમજાવો. ૦૪

Q.3 (a) Describe advantages of Binary ladder D/A converter over weighted resistor

D/A converter.

03

પ્રશ્ન. 3 (અ) બ યનરી લેડર D/A કાંવટયર ન વેઇટેડ રેઝીસ્ટર D/A કાંવટયર પરન ફ યદ વણયવો.

૦૩

OR

(a) Describe the term linearity, resolution and settling time with reference to D/A

converter.

03

(અ) લીનીય રીટી, રીઝોલ્યશુન અને સેટલીંગ ટ ઇમ D/A કાંવટયર ન સાંદભય મ સમજાવો.

૦૩

(b) Compare static RAM with dynamic RAM. 03

(બ) સ્ટેટીક રેમ અને ડ યનેમીક રેમ ની સરખ મણી કરો. ૦૩

OR

(b) Compare combinational circuit with sequential circuit. 03

(બ) કોમ્પબીનેશનલ સકીટ અને સસક્વાંસશયલ સકીટ ની સરખ મણી કરો. ૦૩

(c) Describe decade counter with wave form.

04

(ક) ડીકેડ ક ઉંટર વેવફોમય સ થે વણયવો. ૦૪

OR

(c) Describe 4 bit shift left register. 04

(ક) 4 બીટ શીફ્ટ રજીસ્ટર વણયવો. ૦૪

(d) Simplify following Boolean expression.

C̅D̅ +A̅B̅D̅ + A̅BCD̅ + ACD̅

04

(ડ) નીચેન બલૂીયન expression નુાં સ દુ રૂપ મેળવો.

C̅D̅ +A̅B̅D̅ + A̅BCD̅ + ACD̅

૦૪

OR

(d) Simplify following Boolean expression.

(B +BC) (B + B̅C) (B + D)

04

(ડ) નીચેન બલૂીયન expression નુાં સ દુ રૂપ મેળવો.

(B +BC) (B + B̅C) (B + D)

૦૪

3/3

Q.4 (a) Describe half subtractor with logic diagram. 03

પ્રશ્ન. ૪ (અ) લોજીક ડ ય ગ્ર મ સ થે હ ફ સબટે્રક્ટર વણયવો. ૦૩

OR

(a) Draw logic circuit for the Boolean expression – A̅B̅C̅ +A̅BC +AB̅C + ABC̅ 03

(અ)

આપેલ બલૂીયન expression મ ટે લોજીક સકીટ દોરો. –

A̅B̅C̅ +A̅BC +AB̅C + ABC̅

૦૩

(b) Explain 4:1 multiplexer using NAND gates. 04

(બ) NAND ગેટ ની મદદ થી 4:1 મલ્ટી્લેક્સર સમજાવો.

OR

૦૪

(b) Explain octal to binary encoder. 04

(બ) ઓક્ટલ થી બ યનરી એનકોડર સમજાવો. ૦૪

(c) Explain the race around condition in JK flip flop and master slave JK flip

flop as methods to overcome it.

07

(ક) JK ફ્લીપ ફ્લોપ મ રેસ અર ઉન્ડ કન્ડીશન સમજાવો અને મ સ્ટર સ્લેવ JK ફ્લીપ ફ્લોપ તેન ઉકેલ તરીકે સમજાવો.

૦૭

Q.5 (a) Explain block diagram of digital frequency meter. 04

પ્રશ્ન. ૫ (અ) ડીજીટલ ફ્રીકવન્સી મીટર નો બ્લોક ડ ય ગ્ર મ સમજાવો. ૦૪

(b) Explain common anode type seven segment display. 04

(બ) કોમન એનોડ સ ત સેગમેન્ટ ડીસ્લે સમજાવો. ૦૪

(c) Write advantages of digital instruments over analog instruments. 03

(ક) ડીજીટલ ઇન્સ્ટ્રુમેન્ટ ન એન લોગ ઇન્સ્ટ્રુમેન્ટ પર ન ફ યદ લખો. ૦૩

(d) Explain the quantization and encoding in A/D converter. 03

(ડ) A/D કન્વટયર ન સાંદભય મ ક્વોન્ટ ઇઝેશન અને એનકોડીંગ સમજાવો. ૦૩

************

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GUJARAT TECHNOLOGICAL UNIVERSITY DIPLOMA ENGINEERING – SEMESTER – IV • EXAMINATION – WINTER- 2016

Subject Code: 3340904 Date: 24- 11- 2016

Subject Name: Digital Electronics & Digital Instruments

Time: 02:30 PM TO 05:00 PM Total Marks: 70 Instructions:

1. Attempt all questions.

2. Make Suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

4. Use of programmable & Communication aids are strictly prohibited.

5. Use of only simple calculator is permitted in Mathematics.

6. English version is authentic.

Q.1 Answer any seven out of ten. દશમ ાંથી કોઇપણ સ તન જવ બ આપો. 14

1. Convert (1010.11)2 to decimal number.

૧. (1010.11)2 ને ડેસીમલ નાંબરમ ાં બદલો.

2. Convert (100)10 to binary number.

૨. (100)10 ને બ યનરી નાંબરમ ાં બદલો.

3. Multiply (1.01)2 by (10.1)2.

૩. (1.01)2 ને (10.1)2 વડે ગણુો.

4. Divide (1110100)2 by (111010)2.

૪. (1110100)2 ને (111010)2 વડે ભ ગો.

5. Add (100101)2 to (110111)2.

૫. (100101)2 અને (110111)2 નો સરવ ળો કરો.

6. Subtract (111001)2 from (1110001)2.

૬. (1110001)2 મ ાંથી (111001)2 બ દ કરો.

7. Convert (1035)8 to Decimal number.

૭. (1035)8 ને ડેસીમલ નાંબરમ ાં બદલો.

8. Draw electrical equivalent circuit of NOT gate.

૮. નોટ ગેટની ઈલેક્ટ્રિકલ ઈક્રવવેલન્ટ સર્કિટ દોરો.

9. Draw electrical equivalent circuit of AND gate.

૯. એન્ડ ગેટની ઈલેક્ટ્રિકલ ઈક્રવવેલન્ટ સર્કિટ દોરો.

10. Draw series negative clipper circuit with necessary i/p, o/p waveforms.

૧૦. સીરીઝ નેગેર્ટવ ક્રલપર સર્કિટ જરૂરી ઈનપટુ-આઉટપટુ વેવફોમમ સ થે દોરો.

Q.2 (a) Write any three boolean algebra properties with related boolean expression. 03

પ્રશ્ન. ર (અ) કોઈપણ ત્રણ બલુલયન એલ્જીબ્ર ન ગણુધમો જરૂરી બલુલયન એર્રેશન સ થે લખો.

૦૩

OR

(a) Prove AB + AB + AB + AB = 1

03

(અ) સ લબત કરો: AB + AB + AB + AB = 1

૦૩

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(b) Give advantages of electronic switch. 03

(બ) ઈલેરિોનનક ક્્વચન ફ યદ લખો. ૦૩

OR

(b) Explain positive & negative logic with necessary diagram. 03

(બ) પોલઝર્ટવ અને નેગેર્ટવ લોીક જરૂરી આકૃનત સ થે સમજાવો. ૦૩

(c) Explain Half adder with necessary diagram. 04

(ક) હ ફ એડર જરૂરી આકૃનત સ થે સમજાવો ૦૪

OR

(c) Explain Half subtractor circuit with necessary diagram. 04

(ક) હ ફ સબિેરટર જરૂરી આકૃનત સ થે સમજાવો ૦૪

(d) List various types of flip-flop & explain any one with truth table & diagram. 04

(ડ) નવનવધ રક રન ફ્લલપ-લલોપ લખો અને કોઈ એક ટ્રુથ ટેબલ અને આકૃનત સ થે સમજાવો.

૦૪

OR

(d) List various types of shift register & explain any one with diagram. 04

(ડ) નવનવધ રક રન નશલટ રી્ટર લખો અને કોઈ એક આકૃનત સ થે સમજાવો. ૦૪

Q.3 (a) Write & explain any one DeMorgan’s theorem with diagram and truth table. 03

પ્રશ્ન. 3 (અ) દ’મોગમનનો કોઈ એક નનયમ લખો અને જરૂરી આકૃનત અને ટ્રુથ ટેબલ સ થે સમજાવો.

૦૩

OR

(a) Give answers as per Boolean algebra laws.

A+1=___, A.1=___, A+A=___, A.A=___, A+A=___, A.A=___

03

(અ) બલુલયન એલ્જીબ્ર ન નનયમો રમ ણે જવ બ આપો. A+1=___, A.1=___, A+A=___, A.A=___, A+A=___, A.A=___

૦૩

(b) Explain decade counter in brief with circuit & waveforms. 03

(બ) ડીકેડ ક ઉન્ટર જરૂરી આકૃનત અને વેવફોમમ સ થે ટ ાંકમ ાં સમજાવો. ૦૩

OR

(b) Write short note on 3 to 8 decoder. 03

(બ) ટ ાંકનોંધ લખો: ૩ થી ૮ ડીકોડર. ૦૩

(c) List & explain in brief types of ROM. 04

(ક) ROM ના પ્રકાર લખો અને ટ ૂંકમાૂં સમજાવો. ૦૪ OR

(c) Write short note on BCD to seven segment decoder. 04

(ક) ટ ાંકનોંધ લખો: BCD થી સેવન સેગમેન્ટ ડીકોડર. ૦૪

(d) Write analog output for various digital inputs for a 4-bit D to A converter. 04

(ડ) ૪-બીટ ડી ટુ એ કન્વટમર મ ટે નવનવધ ડીીટલ ઈનપટુ મ ટે એન લોગ આઉટપટુ લખો.

૦૪

OR

(d) Write short note on specifications of D to A converter. 04

(ડ) ટ ાંકનોંધ લખો: ડી ટુ એ કન્વટમરન ્પેનસર્ફકેશન. ૦૪

Q.4 (a) Write in brief about encoders. 03

પ્રશ્ન. ૪ (અ) એનકોડર નવશે ટ ાંકમ ાં લખો. ૦૩

OR

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(a) Give classification & explain in very brief about memory. 03

(અ) મેમરીન ુાં વગીકરણ આપો અને ખ બ ટ ાંકમ ાં સમજાવો. ૦૩

(b) Draw the diagram of any one type of A to D converter. 04

(બ) કોઈપણ એક રક રન એ ટુ ડી કન્વટમરની આકૃનત દોરો. ૦૪

OR

(b) Compare LED & LCD display. 04

(બ) એલ.ઈ.ડી. અને એલ.સી.ડી. ર્ડ્્લેને સરખ વો. ૦૪

(c) Prove: NOR gate is universal gate. 07

(ક) સ લબત કરો : નોર ગેટ યનુનવસમલ ગેટ છે. ૦૭

Q.5 (a) Compare Analog & Digital instruments. 04

પ્રશ્ન. ૫ (અ) એન લોગ અને ડીીટલ સ ધનો સરખ વો. ૦૪

(b) Draw block diagram of Digital Frequency Meter. 04

(બ) ડીીટલ ફ્રીકવન્સી નમટરનો બ્લોક ડ ય ગ્ર મ દોરો. ૦૪

(c) Draw logic circuit for the given boolean expression.

Y= (A.B) + (B.C) + (C.A)

03

(ક) આપેલ બલુલયન એર્રેશન મ ટે લોીક સર્કિટ દોરો. Y= (A.B) + (B.C) + (C.A)

૦૩

(d) Write truth table for a given boolean expression.

Y= (A+B).(B+C) 03

(ડ) આપેલ બલુલયન એર્રેશન મ ટે ટ્રુથ ટેબલ લખો. Y= (A+B).(B+C)

૦૩

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GUJARAT TECHNOLOGICAL UNIVERSITY

DIPLOMA ENGINEERING – SEMESTER – IV • EXAMINATION – SUMMER- 2016

Subject Code: 3340904 Date: 20- 05- 2016 Subject Name: Digital Electronics and Digital Instruments Time: 10:30 AM TO 01:00 PM Total Marks: 70 Instructions:

1. Attempt all questions. 2. Make Suitable assumptions wherever necessary. 3. Figures to the right indicate full marks. 4. Use of programmable & Communication aids are strictly prohibited. 5. Use of only simple calculator is permitted in Mathematics. 6. English version is authentic.

Q.1 Answer any seven out of ten. દશમાથંી કોઇપણ સાતના જવાબ આપો. 14

1. Convert the given decimalnumbers into binary numbers (a) 256 (b) 210

૧. આપેલ ડેિસમલ નબંર ને બાઈનરી નબંર મા પાતંિરત કરો (અ) 256 (બ) 210

2. Give any four advantages of electronic switch. ૨. ઈલેક્ટ્રોિનક િ વચ નાકોઇ ચાર ફાયદાઓ આપો.

3. Draw the symbol and truth table of NAND Gate & EX-OR Gate ૩. NAND ગેટઅને EX-OR ગેટના િચ હો તથા થ ટેબલ દોરો.

4. Draw the logic circuit of Full Subtractor ૪. લ સબટે્રક્ટર ની લોિજક સરિકટ દોરો.

5. Prove that A. (A+B) = A ૫. સાિબત કરો કે A . (A+B) = A

6. Briefly explain the Principle of Duality ૬. ડ આુિલટી નો િસ ાતં ટૂંક મા સમજાવો.

7. Draw the logic circuit of RS flip flop and write its truth table ૭. RS િ લપ લોપ નો લોિજક સરિકટ દોરો અને એની થ ટેબલલખો

8. List any four building blocks of Digital Instruments ૮. િડિઝટલ સાધનો ના કોઇ ચાર િબિ ડંગ લોક લખો.

9. What is the need of Clock and comparator in Digital Instruments? ૯. િડિઝટલ સાધનો મા ક્લોક અને કમપેરેટર ની આવ યક્તા શ ુછે.

10. Give any four applications of Counters.

૧૦. કાઉંટર ના કોઇ ચાર ઉપયોગો આપો.

Q.2 (a) Explain working of PN Junction Diode as switch with switching characteristics

03

. ર (અ) પી. એન . જ કશન ડાયોડ ની િ વચ તરીકે ની કામગીરીિ વિચંગ કેરેક્ટિરિ ટક દોરી સમજાવો .

૦૩

OR (a) Explain the positive clipper circuit with circuit diagram and waveforms. 03

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(અ) પોિઝિટવ િક્લપર સરિકટ ને ડાયગ્રામ અને વેવફોમર્ દોરી સમજાવો . ૦૩

(b) Draw the Logic circuit of JK flip flop and briefly explain its working. 03 (બ) . કે િ લપ લોપ નો લોિજક સરિકટ દોરો અને એની કાયર્ કરવાની રીત

સમજાવો. ૦૩

OR (b) What is combinational circuit? Compare combinational circuits and

sequential circuit. 03

(બ) કોિ બનેશનલ સરિકટ શ ુછે?કોિ બનેશનલ સરિકટ અને સીક્વેંશનલ સરિકટ ની સરખામણી કરો .

૦૩

(c) (i) Convert the following decimal numbers into hexadecimal numbers (a) 3558 (b) 6708

(ii) perform binary addition (a) (1101011) 2 + (0101101) 2 (b) (0001001) 2 + (0101100) 2

04

(ક) (i) આપેલ ડેિસમલ નબંર ને હકે્સ નબંર મા પાતંિરત કરો (અ) ૩૫૫૮ (બ) ૬૭૦૮ (ii) બાઈનરીમા સરવાણો કરો (અ) (11101011) 2 + (10101101) 2

(બ) (10001001) 2 + (00101100) 2

૦૪

OR (c) Answer the following

(a) 73BD + 2A9F (b) (1110001) 2 - (1111011) 2

(c) (28)10 = ( )16 (d) (10110110) 2 = ( ) 16

04

(ક) જવાબ આપો (અ) ) 73BD + 2A9F (બ) (1110001) 2 - (1111011) 2

(સ) (28)10 = ( )16 (ડ)(10110110) 2 = ( ) 16

૦૪

(d) Explain De Morgan’s Theorem with the help of Logic circuit and truth table 04 (ડ) ડી– મોરગન થીયરમ ને લોિજક સરિકટ અને થ ટેબલ ની મદદ થી

સમજાવો ૦૪

OR (d) Prove that AB +ABC + A’B +AB’C = ( B + C ) ( A + B ) 04 (ડ) સાિબત કરો કે AB +ABC + A’B +AB’C = ( B + C ) ( A + B )

૦૪

Q.3 (a) Draw the logic circuit of full adder and briefly explain its working with truth table.

03

. 3 (અ) ` લ એડર ની લોિજક સરિકટ દોરી એની કાયર્ કરવાની રીત થ ટેબલની મદદ થી સમજાવો.

૦૩

OR (a) Draw and briefly explain 2 to 1 multiplexer with logic diagram and truth table 03

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(અ) 2 to 1મ ટી લેક્સર ને લોિજક ડાયગ્રામ અને થ ટેબલ દોરી ટૂંકમા સમજાવો.

૦૩

(b) Explain briefly four basic types of shift registers 03 (બ) િશ ટ રિજ ટસર્ ના ચાર મળૂ પ્રકાર િવશે ટૂંકમા સમજાવો. ૦૩

OR (b) List any three applications of Shift registers and decoders each. 03 (બ) િશ ટ રિજ ટસર્ અને ડીકોડસર્ર બ ે ના કોઇ ત્રણ ઉપયોગો લખો.

૦૩

(c) Give specifications of D/A Converters. Explain the term resolution with respect to D/A converter.

04

(ક) િડઝીટલ થી એનાલોગ ક વરટસર્ ના પેિસિફકેશ સ આપો અને રીઝો યશૂન ને િડઝટલ ટુ એનાલોગ ક વરટસર્ ના સદંભર્ મા સમજાવો.

૦૪

OR (c) Briefly explain successive approximation A/D Converter with diagram. 04 (ક) સક્સેિસવ એપ્રોિક્સમેશન એનાલોગ ટુ િડઝીટલક વરટસર્ ને ડાયગ્રામ દોરી

ટૂંકમા સમજાવો . ૦૪

(d) Give advantages and disadvantages of LED Display and list any two applications of LED.

04

(ડ) એલ. ઈ . ડી િડસ લે ના ફાયદાઓ અને ગેરફાયદાઓ આપો તથા એલ. ઈ . ડી ના કોઇ બે ઉપયોગો લખો.

૦૪

OR (d) Give classification of RAM and give difference between static RAM and

dynamic RAM. 04

(ડ) રેમ નો વગીર્કરણ આપો અને ટેિટક રેમ અને ડાયનેિમક રેમ વ ચે ભેદ આપો ૦૪

Q.4 (a) What is a Decoder? Draw and explain the logic circuit of 3 to 8 decoder and Write its truth table.

03

. ૪ (અ) ૩ થી ૮ ડીકોડર ની લોિજક સરિકટ દોરી સમજાવો અને એની થ ટેબલ લખો. ૦૩

OR (a) Drawthe logic circuit of NOR gate, EX- OR gate and OR gate using NAND

gate. 03

(અ) NAND ગેટ નો ઉપયોગ કરીને નોર ગેટ, એક્સ – ઓર ગેટ અને ઓર ગેટ નો લોિજક સરિકટ દોરો.

૦૩

(b) Give classification of Logic families and briefly explain Diode transistor logic with two input NAND gate.

04

(બ) લોિજક પિરવારનો વગીર્કરણ આપોઆપો અને બે ઈનપટુ NAND ગેટ સાથે ના ડાયોડ ટ્રાિંઝ ટર લોિજકને ટૂંક મા સમજાવો .

૦૪

OR (b) Explain the 1 to 8 demultiplexer with the help of block diagram and truth

table. 04

(બ) ૧ થી ૮ ડીમ ટી લેક્સરને લોક ડાયગ્રામ અને થ ટેબલ ની મદદ થી સમજાવો.

૦૪

(c) Give types of Counters. Explain Decade Counter (Modulo 10 ) with the help 07

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of Logic Diagram , truth table and waveforms (ક) કાઉ ટસર્ ના પ્રકાર આપો . ડીકેડ કાઉ ટસર્ ( મોડ લુો ૧૦) ને લોિજક

ડાયગ્રામ, થ ટેબલ અને વેવફોમર્ દોરી સમજાવો. ૦૭

Q.5 (a) Give types of Codes. Explain any one in details. 04

. ૫ (અ) કોડ ના પ્રકાર આપો. કોઈ પણ એક કોડ સમજાવો. ૦૪

(b) Explain the working of CMOS -NOR Gate with the help of diagram and give advantages of CMOS over TTL.

04

(બ) CMOS –NOR ગેટ ની કાયર્ કરવાની રીત ડાયગ્રામ દોરી સમજાવો અને TTL ઉપર CMOS ના ફાયદાઓ આપો.

૦૪

(c) Explain the construction and working of LCD 03 (ક) L.C.D ની રચના અને કાયર્ કરવાની રીત સમજાવો. ૦૩

(d) Explain the working of Digital frequency meter with the help of Block Diagram and waveforms.

03

(ડ) િડિઝટલ ફ્રીક્વેંસી મીટર ની કાયર્ કરવાની રીત લોક ડાયગ્રામ અને વેવફો સર્ દોરી સમજાવો.

૦૩

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LAXMI INSTITUTE OF TECHNOLOGY, SARIGAM · Maintain digital electronic circuits and instruments. 3....

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