Important RGPV Question, CSIT-304, Digital Circuit & Systems (DCS), III Sem, CSIT

Important RGPV Question

CSIT-304 Digital Systems (DS)

III Sem, CSIT

Table of Contents

UNIT-1 : REVIEW OF NUMBER SYSTEMS AND NUMBER BASE CONVERSIONS

Q.1) Given the following Boolean function: F(W,X,Y,Z) = WX'(Y’ + Z’) + X’.Z’.(W’ Y) where represents the XNOR operation, determine the simplified (minimal) SOP expression for F using boolean algebra and Implement the given function using NOR-NOR logic.

(RGPV Nov 2022)

Q.2) Draw a schematic for a minimal circuit that uses only NOR gates that performs the two’s complement operation on a four bit input value. Let the input be A3:0 and the output be B3:0.

(RGPV Nov 2022)

Q.3) Simplify the Boolean function F together with the don’t-care conditions d in following forms:

i) sum-of-products

ii) product-of-sums

F(w, x, y, z)= Σ (0, 1, 2, 3, 7, 8, 10)

d(w, x, y, z) = Σ (5, 6, 11, 15)

(RGPV Dec 2020)

Q.4) Give a Boolean expression that corresponds to this logic circuit. Develop a truth table for the circuit, showing columns for atleast the output of each 2-input gate. You should invent new variable names for these intermediate outputs.

(RGPV Dec 2020)

Q.5) Differentiate between analog and digital circuits.

(RGPV Nov 2018)

Q.6) Convert the following- (i) (48.625)10 =(); (ii) Divide (IEC87)16 by (A5)16 .

(RGPV June 2014)

Q.7) Convert the Following- (1) Decimal 225.225 to binary, octal and hexadecimal.

(ii) Binary 11010111.110 to decimal, octal and hexadecimal.

(RGPV June 2017)

Q.8) Convert (412)10 to (i) Binary (ii)Octal(iii) Hexadecimal.

(RGPV Dec 2017)

Q.9) Convert the number (210.25)10 to base 2, 8.

(RGPV June 2015)

Q.10) Convert (41.6875)10 to (i) Binary (ii) Octal (iii) Hexadecimal.

(RGPV May 2018)

Q.11) Convert the following –

(i) (1111)2= ( )10

(ii) (10010.1011)2= ( )10

(iii) (23)10 = ( )2

(iv) (5.5)10 =( )2

(v) (47.6)10 = ( )2

(RGPV Nov 2018)

Q.12) Do as directed-

(i) (56)16 = (?)10

(ii) (32)10 = (?)2

(iii) Bubbled OR gate is also called………

(RGPV Dec 2016)

Q.13) Justify the following statements with examples – (i) Excess-3 code is self complementary code.

(ii) Gray code is a reflected code.

(RGPV May 2018)

Q.14) Write briefly about error detecting and error correcting codes.

(RGPV Dec 2014)

Q.15) Define NAND and NOR gates and give their truth tables. Write down the boolean expressions for the output of each gate.

(RGPV Nov 2018)

Q.16) What do you understand by universal gate? Design all logic gates using universal gates.

(RGPV June 2009)

What is universal gate?

(RGPV June 2014)

What are universal gates? Explain with example.

(RGPV Dec 2014)

What are universal gates? Why are they called so?

(RGPV Dec 2015)

Why NAND gate is known as universal gate?

(RGPV Dec 2016)

What is universal gate? Implement AND, OR and NOT gates using NAND gates and NOR gates.

(RGPV Dec 2017)

Q.17) Implement the function F = A(B+ CD) + BC’ using NOR gate.

(RGPV June 2017)

Q.18) State and prove basic laws of Boolean algebra.

(RGPV Dec 2013)

Q.19) Write five theorem of Boolean algebra and simplify F (A+B)’ (A+B).

(RGPV May 2018)

Q. 20) What is Boolean algebra write any three theorems of Boolean algebra?

(RGPV Dec 2017)

Q. 21) State the distributive property of Boolean algebra.

(RGPV Dec 2016)

Q. 22) Simplify the following Boolean function to minimum numbers of literals –

(i) zx+zx’y (ii) xy+xy’ (iii) y(wz’+wz) + xy.

(RGPV June 2017)

Q. 23) Simplify the following Boolean function with K-map- F(w, x, y, z) = (0, 1, 2, 4, 5, 6, 8, 9, 12, 13, 14).

(RGPV June 2010, 2011, 2014)

Simplify the Boolean function using K-map- F(A, B, C, D) = E(0, 1, 2, 4, 5, 6, 8, 9, 12,13, 14)

(RGPV Dec 2017)

Q. 24) Simplify the Boolean function with don’t care conditions and implement it with NAND gates- F(w, x, y, z) = E (1, 3, 7, 11, 15) d (w, x, y, z) = (0, 2, 5)

(RGPV May 2018)

Q. 25) Simplify the Boolean function

F-B’C’D’ + BCD’+ ABCD’ and the don’t care condition d=B’CD’+A’BC’D.

(RGPV June 2017)

Q. 26) Explain Hamming and block codes.

(RGPV June 2011)

UNIT-2 : COMBINATIONAL LOGIC-HALF ADDER, HALF SUBTRACTOR, FULL ADDER, FULL SUBTRACTOR

Q.1) What is decoder? Explain BCD to decimal decoder.

(RGPV June 2020)

Q.2) Design a combinational circuit to convert the binary input ABCD to gray code.

(RGPV June 2020)

Q.3) Design the binary to octal Decoder and explain its working using block diagram.

(RGPV Dec 2020)

Q.4) Design Half adder using NAND gates. Also Draw the diagram?

(RGPV Dec 2020)

Q.5) Draw the truth table and logic diagram of full adder.

(RGPV Dec 2015)

Design and draw a full adder circuits.

(RGPV Dec 2017)

Q.6) Implement a full adder circuit with a decoder and two OR gates.

(RGPV June 2014)

Implement a full adder circuit with a (3 to 8 lines) decoder and two OR gates.

(RGPV Dec 2017)

Q.7) Explain full adder and design a full adder circuit using 3 to 8 decoder and two OR gates.

(RGPV Dec 2016)

Q.8) Design a full subtractor circuit using decoder and OR gates.

(RGPV Dec 2015)

Q.9) Design a full subtractor using logic gates.

(RGPV Dec 2014)

Q.10) Explain half subtractor circuit.

(RGPV Dec 2013)

Q.11) Design a full adder using minimum logic gates and also discuss he working of parallel adder.

(RGPV Dec 2012)

Q.12) Draw the logic diagram of look-ahead carry generator and explain Fits working.

(RGPV Dec 2008, 2015)

Explain the operation of look-ahead carry generator.

(RGPV June 2007, 2008, 2010)

Discuss/Explain the working of look ahead carry generator.

(RGPV Dec 2012, June 2015)

What is look ahead carry generator? Explain with logic diagram.

(RGPV June 2014)

Design and explain the working of look ahead carry generator.

(RGPV Dec 2014)

Explain look ahead carry generator.

(RGPV Dec 2016)

Q.13) Explain/Design BCD adders.

(RGPV June 2008, 2012, Dec 2013)

Design and explain the working of 4-bit BCD adder.

(RGPV Feb 2010)

Design a BCD adder and also give the rules of BCD addition.

(RGPV June 2010)

Design a BCD adder using logic gates.

(RGPV Dec 2012)

Design and explain the working of BCD adder.

(RGPV Dec 2014)

Draw the logic diagram of BCD adder and explain its working.

(RGPV June 2007, Dec 2015)

Write short note on BCD adders.

(RGPV Dec 2017)

Q.14) Draw and explain a 4-bit magnitude comparator.

(RGPV June 2014)

Q.15) Implement the following Boolean function using 4:1 multiplexer using A and B variables to the selection lines –

F(A, B, C) = Σm(1, 4, 5, 7).

(RGPV Dec 2015)

Q.16) Design a BCD to excess-3 code converter.

(RGPV Dec 2015, May 2018)

UNIT-3 : SEQUENTIAL LOGIC-FLIP-FLOPS, D, T, S-R, J-K MASTER- SLAVE, RACING CONDITION, EDGE & LEVEL TRIGGERED CIRCUITS

Q.1) Explain the term biodiversity with suitable examples.

(RGPV Dec 2014)

Q.2) What do you understand by the term biodiversity? Name and discuss the three hierarchical levels to study the concept of biodiversity.

(RGPV June 2011)

Q.3) Write short note on genetic biodiversity.

(RGPV June 2015)

Q.4) Write a detailed note on biodiversity.

(RGPV Dec 2012)

Q.5) Discuss biodiversity, importance and uneven distribution over earth’s surface.

(RGPV June 2015)

Q.6) Write short note on-Ethical value of biodiversity.

(RGPV June 2012)

Q.7) Write short note on – Endemic and exotic species.

(RGPV June 2013)

Q.8) Discuss the concept of endangered species

(RGPV June 2011)

Q.9) Write short note on – Endemic species of India.

(RGPV June 2012)

Q.10) Write an explanatory note on Endangered and Endemic species of India.

(RGPV Dec 2015)

Q.11) Explain In-situ and Ex-situ conservation along with their merits and limitations.

(RGPV Dec 2015)

Q.12) What are the factors responsible for loss of plant and genetic Biodiversity? Discuss steps needed to prevent them.

(RGPV Dec 2008, 2013)

Q.13) Discuss the concept of biodiversity at three hierarchical levels. Write importance and conservation of biodiversity.

(RGPV June 2016)

Q.14) Write short note on – Biodiversity treaty:

(RGPV June 2012)

Q.15) How many biogeographical classifications are there in India?

(RGPV June 2022)

Q.16) What are the major biogeographical region in India?

(RGPV June 2022)

Q.17) Why is India regarded as a mega diversity nation enumerate the biogeographical classification of India?

(RGPV June 2022)

Q.18) How many biogeographical regions are there in the world?

(RGPV June 2022)

UNIT-4 : INTRODUCTION TO A/D & D/A CONVERTERS & THEIR TYPES, SAMPLE AND HOLD CIRCUITS, VOLTAGE TO FREQUENCY & FREQUENCY TO VOLTAGE CONVERSION

Q.1) What is a Shift Register? Draw and explain shift Left- Right shift register.

(RGPV Dec 2020)

Q.2) Explain the race condition in S-R flip flop. Also explain how it is removed in J-K flip flop.

(RGPV Dec 2020)

Q.3) How a multiplexer can be used as ROM? Explain in brief.

(RGPV Dec 2020)

Q.4) Design a sequential circuit using T flip-flop for the following state table.

Assume any suitable assumptions for state assignment.

(RGPV Nov 2022)

Q.5) Design a synchronous counter to count in the random sequence 0, 2, 4, 5, 7.0, 2, 4, 5, 7… using D flip-flop.

(RGPV Nov 2022)

Q.6) Explain the concept of working and applications of following memories-

i) ROM

ii) PLA

iii) DRAM

iv) FLASHRAM

(RGPV Nov 2022)

Q.7) Given the network of Fig., determine the functions f2 and f3 if f1 = xz+x’z’ and the overall transmission function is to be

f(w, x,y,z)= Σ (0,3,6,10,11,12)

(RGPV Nov 2022)

Q.8) Each of the following functions actually represents a set of four functions, corresponding to the possible assignments of the don’t-care terms.

F1 (w,x,y,z)= Σ (1,3,5,6,9,10)+ (11,12)

F2(w,x,y,z)= Σ (0,3,4,5,8,9)+ (6,7)

i) Find f3-f1.f2. How many functions does f3 represent?

ii) Find f4= f1 +f2. How many functions does f4 represent?

(RGPV Nov 2022)

Q.9) Explain synchronous and Asynchronous counter.

(RGPV June 2020)

Q.10) What is Flip-Flop? Explain Master Slave J-K flip-flop.

(RGPV June 2020)

Q.11) Differentiate static and dynamic RAM.

(RGPV Nov 2019)

Q.12) Write short note on flash RAM.

(RGPV Nov 2018, May 2019)

Q.13) What are sequential circuits? What is the main difference between the combinational circuits and sequential circuits?

(RGPV Nov 2018)

Q.14) What is a flip-flop? Explain the principle of operation of R-S flip-flop with truth table.

(RGPV Nov 2018)

What is a lip-flop? Explain with a suitable example.

(RGPV Dec 2017)

Q.15) What is a shift register? Explain.

(RGPV June 2010, Dec 2017)

Discuss the shift registers.

(RGPV June 2011)

Q.16) Design a synchronous BCD counter with JK flip-flops.

(RGPV Dec 2016)

Q.17) Design a MOD-6 counter using J-K flip flops.

(RGPV Dec 2012)

Q.18) Design a MOD-12 binary counter using J-K flip-flop.

(RGPV June 2015)

Q.19) Find the MOD number of counter in fig Determine its counting sequence. Draw the state diagram. Find the frequency at output QD if input frequency is 7 kHz.

(RGPV June 2014)

Q.20) Give a brief introduction of a semiconductor memories.

(RGPV Dec 2011)

Give a comparison of various semiconductor memories.

(RGPV June 2014)

Q.21) State and differentiate between ROM, PROM. EPROM and EEPROM.

(RGPV Dec 2014)

Q.22) Write a short note on PLA.

(RGPV Dec 2010, June 2012, May 2018, 2019)

Explain PLAS.

(RGPV Dec 2013)

Q.23) What is RAM? Distinguish between SRAM and DRAM. What is PLA?

(RGPV Dec 2015)

Q.24) Design a combinational circuit using ROM. The circuit accepts a 3-bit number and generates an output binary number equal to the square of the input number.

(RGPV June 2014)

Derive a PLA program table for a combinational circuit that squares a 3-bit number.

(RGPV June 2017)

Q.25) A combinational logic circuit is defined by the functions – F1= Σ(3 , 5, 6, 7) and F₂ = Σ(0, 2, 4, 7). Implement the circuit with a PLA having three inputs, four product terms and two outputs.

(RGPV Dec 2016)

UNIT-5 : INTRODUCTION TO DIGITAL COMMUNICATION, NYQUIST SAMPLING THEORAM, TIME DIVISION MULTIPLEXING

Q.1) Write notes on the following

i) A/D and D/A convertors

ii) CMOS Logic.

(RGPV Nov 2022)

Q.2) How is interfacing of TTL to MOS achieved?

(RGPV Dec 2020)

Q.3) Describe the application of Monostable multivibrator?

(RGPV Dec 2020)

Q.4) Implement the following circuit using CMOS logic

i) Y=A.B

ii) Y=A+B

(RGPV June 2020)

Q.5) With a neat diagram, explain the operation of 8 bit successive approximation ADC.

(RGPV June 2020)

Q.6) Drew and explain the working of A/D converter.

(RGPV Nov 2019)

With the help of circuit diagram explain the A to D converter.

(RGPV June 2010, 2012)

Explain A/D converter and its working.

(RGPV Dec 2013)

Explain analog to digital converter.

(RGPV Dec 2016)

Q.7) What is the need for A/D converter?

(RGPV Dec 2014)

What is the need of analog to digital conversion?

(RGPV Dec 2015)

Q.8) What are the applications of analog to digital converter?

(RGPV June 2015)

Q.9) Explain flash A/D converter with circuit diagram and parameters.

(RGPV June 2011)

Q.10) Discuss 3-bit analog to digital flash type converter.

(RGPV May 2019)

Q.11) Explain with the help of block diagram any one type of analog to digital converter.

(RGPV Dec 2012

With a neat diagram explain successive approximation type A/D converter in detail.

(RGPV Dec. 2010, 2014)

Explain successive approximation techniques for analog to digital conversion.

(RGPV Feb 2010, June 2015)

Explain any one type of analog to digital converter in detail.

(RGPV May 2018)

Q.12) Why analog to digital converters is needed? Explain any one digital converters.

(RGPV Dec 2017)

Q.13) Enlist the various types of analog to digital (A/D) converter and explain any one of them with neat sketch.

(RGPV Dec 2015)

Q.14) State maximum conversion time and average conversion time.

(RGPV Dec 2013)

Q.15) Distinguish single slope and double slope A/D converter.

(RGPV Dec 2014)

Q.16) What is a bipolar D/A converter?

(RGPV June 2014)

Q.17) Explain a 4 bit R-2R ladder type D/A converter in detail.

(RGPV Dec 2008, 2014)

Explain the operation of R-2R ladder type digital to analog (D/A) converter with a neat sketch.

(RGPV Dec 2015)

Q.18) How can we describe the resolution of a digital to analog converter?

(RGPV June 2015)

Q.19) Explain the transfer characteristics and various performance parameters of DAC.

(RGPV June 2015)

Q.20) Discuss about the sample and hold circuits.

(RGPV June 2009, Nov 2018)

Write short note on sample and hold circuits.

(RGPV Dec 2010, 2016, June 2017)

Discuss about sample and hold circuits in A/D converter.

(RGPV June 2011)

Explain the principle working of sample and hold circuits.

(RGPV Dec 2012)

Draw the circuit diagram of sample and hold circuit and explain its working.

(RGPV Dec 2015)

Explain sample and hold circuit.

(RGPV May 2019)

Q.21) With the help of circuit diagram explain the V-F converter.

(RGPV June 2012)

Explain the principle working of V-F converter.

(RGPV Dec 2012)

With the help of circuit diagram explain the working of V-F converters.

(RGPV Dec 2014)

Explain voltage to frequency converter with the help of block diagram and waveforms.

(RGPV Dec 2015, June 2017, May 2018)

Write a short note on V-F converters.

(RGPV June 2015)

Q.22) Fig shows a computer control of motor speed. It can change motor speed from 0 to 1500 r.p.m. Find the number of bits of the computer so that it can control the speed within 1 r.p.m. of required speed.

(RGPV June 2014)

Q.23) Draw and explain the working of bistable multivibrator.

(RGPV Dec 2005, June 2009, Nov 2019)

Describe bistable multivibrator with diagram and working principle.

(RGPV June 2011)

Q.24) Explain the terms-monostable, bistable and astable multivibrator.

(RGPV Dec 2015)

Q.25) Explain monostable multivibrator and write its applications.

(RGPV June 2010, Dec 2010, 2017)

With the help of timing diagram explain the working of monostable multivibrator.

(RGPV June 2012)

With the help of circuit diagram and timing waveforms explain the working of monostable multivibrator.

(RGPV Dec 2014)

Explain the operation of monostable multivibrator with the help of waveforms.

(RGPV June 2015)

Draw and explain the working of monostable multivibrator.

(RGPV May 2018)

Draw and explain monostable multivibrator.

(RGPV May 2019)

Q.26) Distinguish between monostable and astable multivibrator.

(RGPV June 2017)

Q.27) Draw and explain the working of Schmitt trigger.

(RGPV Nov 2019)

Discuss Schmitt trigger circuits.

(RGPV June 2009, Dec 2013)

Write short note on Schmitt trigger

(RGPV June 2010, 2012)

Draw a Schmitt trigger circuit and explain with waveforms.

(RGPV, Nov./Dec. 2007, June 2015)

With the help of circuit diagram explain the working of Schmitt trigger.

(RGPV Dec 2012, 2014)

Draw the circuit diagram of Schmitt trigger and explain its working.

(RGPV Dec 2015)

What is Schmitt trigger circuit?

(RGPV June 2014)

Write short note on Schmitt trigger circuits.

(RGPV Dec 2017)

Q.28) What do you understand by logic families?

(RGPV June 2015)

Q.29) Write characteristics of digital logic families.

(RGPV Dec 2015)

Q.30) Draw and explain DTL circuit. Enlist its advantages and disadvantages.

(RGPV June 2017)

— Best of Luck for Exam —