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Acharya Nagarjuna University

VIEWS: 143 PAGES: 16

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          Model Papers
       ELECTRONICS
        (UG courses)
 Admitted Batch 2008 -2009

            May 2008




A.P. State Council of Higher Education
                                                                                  2

                 B.Sc (Electronics) – Scheme of instruction

                                                                              Total
S.No.     Year                       Paper                    Hours/week
                                                                              hours

                                      A. THEORY

        First       Paper-I
 01                                                           4hrs/ Week   120 Hours
        Year        Circuit Analysis and Electronic Devices
        Second      Paper-II
 02                                                           4hrs/ Week   120 Hours
        Year         Analog Circuits and Communications
        Third       Paper –III
 03                                                           3hrs/ Week    90 Hours
        Year        Digital Electronics and Microprocessor.
                             Paper –IV (Electives)
                            Any one of the following
        Third       i) Paper – IVA
 04                                                           3hrs/ Week    90 Hours
        Year        Embedded Systems and Applications
                    ii) Paper – IVB
                    Digital Design using VHDL

                                   B. PRACTICALS

                    Paper – I: Circuit Analysis and
        First                                                               90 Hours
 05                 Electronic Devices Lab          3hrs/Week
        Year                                                               (30Sessions)
                    Paper – II: Analog Circuits and
        Second                                                              90 Hours
 06                 Communication Lab                         3hrs/ Week
        Year                                                               (30Sessions)
                    Paper – III: Digital Electronics and
 07     Third                                                               90 Hours
                    Microprocessor Lab                        3hrs/ Week
        Year                                                               (30 Sessions)
                            Paper – IV (Electives)
                           Any one of the following

                    Paper - IV (A): Embedded Systems and
 08     Third                                                               90 Hours
                    Applications Lab                          3 hrs/Week
        Year                                                               (30 Sessions)
                    Paper - IV (B): Digital design Using
                    VHDL Lab
                                                             3

  SCHEME OF QUESTION PAPER for I year B.Sc.Electronics


                             SECTION – A
                   (Essay type questions – 4 x 14 = 56)

   One question from each unit with internal choice.




                               SECTION – B
                            (Short questions 4x5 =20)

Two questions form each unit
Total questions = 8
Answer any 4 questions




                                SECTION – C
                              Theory & Problems
                                 (4 x 6 = 24)
Two questions (one theory and one problem) from each unit.
Total 4 questions and 4 problems
Answer any four
                                                                                              4

                         Acharya Nagarjuna University
                                 Model Question Paper
                Paper-I – Circuit Analysis and Electronic devices
Time: 3 hrs.                                                                 Max marks:100.
                                PART-A (4 x 14 = 56marks)

                                   Answer all questions
                               Each question carries 14 marks

1. (a) State and explain kirchoff’s laws. Explain loop current method of solving two source
       networks.
                                              (Or)
  (b) State and prove superposition and reciprocity theorems.

2. (a) Discuss the transient response of RC circuit with DC sources.
                                              (Or)
  (b) Draw the parallel LCR circuit. Derive expressions for resonant frequency, current and
     impedance at resonance. Draw the frequency curve and explain.

3 (a) What is Zener diode? Explain the working mechanism, draw the V-I characteristics.
      Also explain application of Zener diode as voltage regulator.
                                              (Or)
 (b) Draw the experimental circuit to study the input and output characteristics of BJT in CE
     mode. Draw the Curves and explain the features in detail.

4. (a) Describe the principle, construction, working and characteristics of LDR.
                                              (Or)
  (b) Describe the working and characteristics of JFET.

                                  PART-B (4 x 5 = 20 marks)

                               (i) Answer any FOUR questions
                              (ii) Each question carries 5 marks

5. Define RMS value and derive an expression for the RMS value of voltage.
6. State and explain maximum power transfer theorem.
7. Discuss the frequency response of RC circuit.
8. Explain selectivity and bandwidth of resonance circuit.
9. Explain the working of the diode based on diode equation.
10 Define α and β of BJT and obtain their relations.
11. Explain the V-I characteristics of UJT.
12. Describe the two transistor representation of SCR.
                                                                                                5

                                 PART-C (4 x 6 = 24 marks)

                                (i) Answer any FOUR questions
                               (ii) Each question carries 6 marks

13. State and explain Thevenin’s theorem.
14. Find peak, average, rms values and frequency of an AC current represented by i = 28.4
      Sin 628t.
15. Explain the action of RL circuit as integrator and differentiator.
16. A series RLC circuit containing of 10 ohm resistance is to have a bandwidth of 100
     rad/sce. Determine the value of the capacitance to make the system resonant at 400
     rad/sce.
17. Write a note on Varicap diode.
18. In a transistor, the base current is 0.08 mA and emitter current is 9.6 mA. Find
      (a)collector current, (b) α and (c)β.
19. Explain an application of SCR as power control.
20. A silicon UJT has an inter base resistance of 10 K ohm. Its intrinsic stand-off ratio is 0.6.
     Find the values of resistances RB1 and RB2.

                                            ***************
                                                             6

 SCHEME OF QUESTION PAPER for II year B.Sc.Electronics


                             SECTION – A
                   (Essay type questions – 4 x 14 = 56)

   One question from each unit with internal choice.




                               SECTION – B
                            (Short questions 4x5 =20)

Two questions form each unit
Total questions = 8
Answer any 4 questions




                                SECTION – C
                              Theory & Problems
                                 (4 x 6 = 24)
Two questions (one theory and one problem) from each unit.
Total 4 questions and 4 problems
Answer any four
                                                                                              7

                         Acharya Nagarjuna University
                                 Model Question Paper
                Paper-II – Analog Circuits and Communications
Time: 3 hrs.                                                                  Max marks:100.
                                PART-A (4 x 14 = 56marks)

                                   Answer all questions
                               Each question carries 14 marks

1. (a) Explain the working of full wave rectifier and derive the expressions for efficiency and
       ripple factor.
                                              (Or)
  (b) Explain the principle and working of Switch mode power supply (SMPS).

2. (a) Draw the circuit diagram of an single stage RC coupled amplifier and explain its
       working and frequency response.
                                              (Or)
  (b) Mention the characteristics of an ideal OP AMP. Draw the circuit of an op amp
     inverting amplifier and explain its action.

3 (a) Describe the Working of voltage follower using OP AMP. Explain the working of
      integrator using OP AMP.
                                              (Or)
 (b) Draw the circuit diagram of a Wein bridge oscillator using OP AMP and explain its
     working. Derive the expression for frequency.

4. (a) What is modulation? Explain the need for modulation in communications. With neat
       circuit diagram explain how AM waves were recovered.
                                              (Or)
  (b) What is the principle of super heterodyne radio receiver? Draw the block diagram and
     explain the function of each block.

                                      PART-B (4 x 5 = 20 marks)

                               (i) Answer any FOUR questions
                              (ii) Each question carries 5 marks

5. Explain the working of Π-filter.
6. Draw the pin diagram and explain the characteristics of 78XX regulator.
7. What is feed back? Explain different types of feedbacks.
8. Define Slew rate and CMRR.
9. Describe the action of comparator using OP AMP.
10 Explain the action of lagorithmic amplifier using OP AMP.
11. Derive power relations in AM wave.
12. State the advantages of FM over AM.
                                                                                             8
                                 PART-C (4 x 6 = 24 marks)

                                (i) Answer any FOUR questions
                               (ii) Each question carries 6 marks

13. A half wave rectifier uses a transformer of turns ratio 8:1. If the primary voltage is
     230(rms); find (i) dc output voltage (ii) peak inverse voltage.
14. Explain the working Series voltage regulator using BJT.
15. Calculate Vo for the circuit given below.




16. Explain the effect of negative feedback on gain and bandwidth.
17. Draw the circuit using OP AMP to solve second order differential equation and explain.
18. Find the output voltage of an OP AMP inverting adder for the following sets of input
      voltages and resistors. In all cases Rf = 1Mohm.
                         V1 = -3V , V2 = +3V , V3 = + 2V
                          R1 = 250K, R2 = 500K , R3 = 1 M.
19. A carrier wave of 1000w is subjected to 100% modulation. Calculate (i) power of
     modulated wave (ii) power in USB (iii) power in LSB.
20. Describe the working of Ratio detector.

                                            ***************
                                                          9

SCHEME OF QUESTION PAPER for III B.Sc.Electronics - III


                             SECTION – A
                   (Essay type questions – 4 x 14 = 56)

   One question from each unit with internal choice.




                               SECTION – B
                            (Short questions 4x5 =20)

Two questions form each unit
Total questions = 8
Answer any 4 questions




                                SECTION – C
                                 (4 x 6 = 24)
Two questions from each unit.
Total questions = 8
Answer any four questions
                                                                                            10

                         Acharya Nagarjuna University
                                 Model Question Paper
                Paper-III- Digital Electronics and Microprocessor
Time: 3 hrs.                                                                 Max marks:100.
                                PART-A (4 x 14 = 56marks)

                                    Answer all questions
                                Each question carries 14 marks

1. (a) Describe the following logic gates and draw their truth tables
       (i) OR (ii) AND (iii) NOT (iv) NAND (v) NOR

                                  (Or)
  (b) Explain the simplification of Boolean Expressions and formats for Two and Three variable K-Maps.

2. (a) Implement the logic diagrams of HA and FA circuits and discuss the operations with relevant thruth
tables.
                                    (Or)
(b) Draw the circuit diagram of decade counter and discuss its operation with the help of truth table.


3. (a) Explain the architecture of 8085 microprocessor with neat sketch and explain its operation.

                                    (Or)
(b) Write a program for 8085 A to find the larger of the two number stored in location OAOOH and
OAO1H and store it in memory location OAO2H.


     4. (a) Explain mode O programming of PPI 8255 and describe Bit Set and Reset mode of this I.C

                                                    (Or)

 (b) What is an ADC? Explain the successive Approximate method of A/D conversion.

                              PART-B (4 x 5 = 20M)

  (i) Answer Any 4 questions (ii) Each question carries 5 marks.

5. Implement OR, AND, NOT gates using NOR.

6. State and prove De Morgans laws.

7. Explain the operation of De-multiplexer.

8. Explain the Basic Difference between RAM and ROM.

9. Define Instruction cycle and Machine cycle.

10. Classify the instructions of 8085.
                                                                                           11
11. Frame control word for the following configuration of the ports of Intel 8255 for mode operation;
            Port A – Input.
            Port B – Input.
            Port C higher – Input.
            Port C lower – Input.

12. What is a D/A converter? Discuss its applications?

                            PART-C (4 x 6 = 24M)

  (i) Answer Any 4 questions (ii) Each question carries 6 marks.

13. Find the value of X in the following:

     (i) 5810 = X2 (ii) 111112 = X10 (iii) 1A616 = X 10

14. Explain with examples the terms SOP and POS.

15. Explain the principle of encoder logic circuit.

16. Describe the operation of JK flip flop with truth table.

17. Draw pin configuration of 8085.

18. Write an assembly language program to add two 8-bit numbers, the sum may be of 16-bits.

19. Write short note on stepper motor control.

20. Discuss binary weighted register D/A converter.




                                            ***************
                                                          12


 SCHEME OF QUESTION PAPER for III B.Sc.Electronics - IV


                             SECTION – A
                   (Essay type questions – 4 x 14 = 56)

   One questions from each unit with internal choice.




                           SECTION – B(4x5 =20)

Two questions form each unit
Total questions = 8
Answer any 4 questions




                               SECTION – C
                                (4 x 6 = 24)
Two questions from each unit.
Total questions = 8
                          Answer any 4 questions
                                                                                             13

                         Acharya Nagarjuna University
                                 Model Question Paper
               Paper-IV(a)- Embedded Systems and Applications
Time: 3 hrs.                                                                 Max marks: 100.
                                 PART-A (4 x 14 = 56marks)

Answer all questions
Each question carries 14 marks

1. (a). With a neat diagram, describe the functional blocks of MCS-51 series microcontrollers
                                             (OR)
(b).Describe complete memory organization in MCS-51 series microcontrollers.
2. (a). With suitable examples explain various addressing modes of MCS-51microcontrollers.
                                             (OR)
  (b).Explain in detail about various assembly language programming tools.
3. (a). Distinguish the deference between a Counter and Timer. Discuss in detail about the
       function of Timer/ counter of 8051.
                                             (OR)
  (b). What is an interrupt? Explain interrupt structure of 8051.
4. (a). Describe the operation of 7-segment display and explain how it is interfacing with
microcontroller.
                                             (OR)
   (b). Describe the operation of LCD. Explain the Instruction set of LCD.


                                   Part – B (4 x 5 = 20M)

                           Answer any FOUR of the following

5. What is an Embedded System?
6. Describe the basic differences between Processor and Controller.
7. What is the difference between Mov, MovC and MovX instructions?
8. What are the various development tools need for testing and development of MC boards?
9. Explain hardware structure of Port-3 in MCS-51.
10. Distinguish the difference between Synchronous and Asynchronous data transfer.
11. Draw the circuit diagram of simple keyboard with MC and explain its operation.
12. Briefly explain the function of a stepper motor.
                                                                                           14



                                    Part – C (4 x 6 = 24M)

                             Answer any FOUR of the following

13. Draw the pin diagram of 8051 controller.
14. What is Stack and what is Stack pointer?
15. Write a program to generate a square wave of 50Hz frequency using a port line.
16. Briefly explain software development tools.
17. Explain Interrupt priority register in 8051.
18. What is serial communication? Explain the Mode0 operation.
19. Draw the diagram to interface an LED to controller and write a program to blink LED.
20. Draw the circuit diagram of interfacing DAC to controller.




                                     *************
                                                                                        15


                          Acharya Nagarjuna University
                                 Model Question Paper
                      Paper-IV(b)- Digital design using VHDL
Time: 3 hrs.                                                                Max marks:100.
                                PART-A (4 x 14 = 56marks)

                                    Answer all questions
                                Each question carries 14 marks

1. (a). What are different design units of VHDL?
                                              (OR)
   (b). Explain different process statements in behavioral modeling?
2. (a). Explain the architecture body for Data Flow Modeling? Briefly discuss about
        Concurrent Signal Assignment statement?
                                              (OR)
   (b). Give about the component Declaration in structural modeling?
3. (a). Define Sub-program, Discuss about functions and procedures of Sub-programs?
                                            (OR)
   (b). Discuss package body and Generate Statements?
4. (a). Write Test bench program for a Full Adder Circuit?
                                             (OR)
    (b). Explain about Modelling Delays.
                                   Part – B (4 x 5 = 20M)

                           Answer any FOUR of the following

5. Give the differences between HDL and other Software languages?
6. Give in Brief the language elements of VHDL?
7. Give about Conditional Signal assignment statements in data flow modeling?
8. Write a program for AND gate in structural modellng?
9. Discuss Design File?
10. Discuss about Implicit Visibility and Explicit Visibility?
11. Write Test bench program for a Half Adder Circuit?
12. What are Model Entity interfaces?
                                                               16
                                   Part – C (4 x 6 = 24M)

                            Answer any FOUR of the following

13 What are capabilities of VHDL?
14. Discuss about relational operators?
15. Discuss about block statement?
16. How do you resolve the signal values?
17. What is in by sub-program over loading?
18. What are entity statements?
19. Discuss about modeling conditional Operations?
20. Discuss about State maching Modelling?

								
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