Kerala Plus Two Question Paper 2023 Electronic System

SECOND YEAR

Kerala Board
Question Paper
2023

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Reg. No. : ......................................
Name : ...........................................
SY-553
SECOND YEAR HIGHER SECONDARY EXAMINATION, MARCH 2023

Part – III Time : 2 Hours
ELECTRONIC SYSTEMS Cool-off time : 15 Minutes
Maximum : 60 Scores

General Instructions to Candidates :
 There is a ‘Cool-off time’ of 15 minutes in addition to the writing time.
 Use the ‘Cool-off time’ to get familiar with questions and to plan your answers.
 Read questions carefully before answering.
 Read the instructions carefully.
 Calculations, figures and graphs should be shown in the answer sheet itself.
 Malayalam version of the questions is also provided.
 Give equations wherever necessary.
 Electronic devices except non-programmable calculators are not allowed in the
Examination Hall.
 
    15  ‘  ’ .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

SY-553 1 P.T.O.

Answer any 5 questions from 1 to 6. Each carries 1 score. (5  1 = 5)
1. Example of wave shaping circuit is ________.
(amplifier, multivibrator, clipper, voltage follower)

2. If 5 V dc is applied to a differentiator circuit. Vo/p =

(10 V, 2.5 V, 0 V, 5 V)

3. For generating sine wave of frequencies above 1 MHz _______ oscillator is used.
(colpitts, RC phase shift oscillator, astable multivibrator, All of the above)

4. The SiO2 layer in an IC act as ________.

(resistor, insulating layer, conducting layer, none of these)

5. ________ converts electrical energy into sound energy.
(Loud speaker, Microphone, Photodiode, LED)

6. Example for 16 bit microprocessor is _________.
(8085, 8086, 80386, 80486)

Answer any 11 questions from 7 to 19. Each carries 2 scores. (11  2 = 22)
7. Frequency response curve of a circuit is given below :
(a) Identify the circuit. (1)
(b) Draw the circuit diagram. (1)

SY-553 2

1  6    5  .
1  . (5  1 = 5)
1. Wave shaping   ________.
(amplifier, multivibrator, clipper, voltage follower)

2. 5 V dc  differentiator   Vo/p   =
(10 V, 2.5 V, 0 V, 5 V)

3. 1 MHZ   frequency  sine wave  _______
oscillator .
(colpitts, RC phase shift Oscillator, astable multivibrator, All of the above)

4. SiO2 layer IC  ________  .
(resistor, insulating layer, conducting layer, None of these)

5.  energy    ________ .
(loud speaker, microphone, photo diode, LED)

6. 16 bit microprocessor   _________.
(8085, 8086, 80386, 80486)

7  19    11  .
2  . (11  2 = 22)
7.   Frequency response curve   :
(a)  . (1)
(b)   . (1)

SY-553 3 P.T.O.

8. A negative clamper clamps the input signal negatively at zero. Draw the circuit
diagram and output waveform of a negative clamper.

9. State condition for sustained oscillations in oscillators.

10. Compare negative feedback and positive feedback.

11. Draw the block diagram and truth table of 4:1 multiplexer.

12. Draw the block diagram of Master Slave JK flip-flop.

13. (a) RADAR stands for ________. (1)
(b) Draw the block diagram of RADAR. (1)

14. Name any two operating system used in mobile phones.

15. Draw the block diagram of PA system.

16. Explain the principle of light transmission through an optical fibre with necessary
diagram.

17. (a) ________ is used to convert electrical energy to light energy in an optic fibre
communication system. (1)
(b) Write any two advantages of OFC. (1)

18. Draw the block diagram of Micro Controller.

19. Explain the working of ECG with the help of a block diagram.

SY-553 4

8.      negatively  
.       waveform 
.

9. Oscillators  sustained oscillation   conditions .

10. Negative feedback  positive feedback   .

11. 4:1 multiplexer    truth table  .

12. Master Slave JK flip flop    .

13. (a) RADAR    ________ . (1)
(b) RADAR    . (1)

14.      operating system 
.

15. PA system    .

16.       light
transmission    .

17. (a)  optic fibre communication system  electrical energy  light energy
  ________ . (1)
(b) OFC   2  . (1)

18. Micro controller    .

19.    ECG   .

SY-553 5 P.T.O.

Answer any 7 questions from 20 to 28. Each carries 3 scores. (7  3 = 21)

20. Fill in the blanks :

A B C

(a) ____________

(b) ____________

21. Write different steps involved in IC fabrication technology.

22. Input output waveforms of an amplifier circuit is given below. Draw the circuit to
obtain the same. Calculate the gain.

23. (a) __________ is example of op-amp IC. (1)

(b) Write the characteristics of an ideal op-amp. (2)

SY-553 6

20  28    7  .
3  . (7  3 = 21)

20.   :

A B C

(a) ____________

(b) ____________

21. IC fabrication technology    .

22.  amplifier    waveform  . 
    . Gain .

23. (a) __________ op-amp IC  . (1)

(b)  ideal op-amp   . (2)
SY-553 7 P.T.O.

24. (a) Inverter is used to convert _________ to ________. (1)

(b) Draw the block diagram of inverter. (2)

25. List out the advantages of SMPS over linear power supply.

26. Draw the circuit diagram of a 3 bit asynchronous counter that counts from 000 to 111.

27. (a) Write the truth table of a flip-flop whose output toggles when both the inputs

are HIGH. (1)

(b) Draw the circuit diagram of the above flip-flop using NAND gates only. (2)

28. (a) What is the basic working principle behind moving coil microphone. (1)

(b) Draw the cross sectional view of a moving coil microphone. (2)

Answer any 3 questions from 29 to 33. Each carries 4 scores. (3  4 = 12)

29. (a) Classify filters based on their range of frequencies passed or blocked by it. (2)

(b) Define :

(i) Cut off frequency

(ii) Pass band (2)

SY-553 8

24. (a) _________  ________   inverter . (1)

(b)     . (2)

25. SMPS  linear power supply       ?

26. 000  111     3 bit asynchronous

   .

27. (a)   HIGH   toggles  flip-flop
 truth table . (1)

(b)   flip-flop    NAND
   . (2)

28. (a)  moving coil microphone   . (1)

(b)  moving coil microphone   . (2)

29  33    3  .

4  . (3  4 = 12)

29. (a)       
    . (2)

(b)  :

(i) Cut off frequency

(ii) Pass band (2)

SY-553 9 P.T.O.

30. (a) Identify the given circuit. (1)

(b) Draw the input output waveform. (2)

(c) Write one application of the given circuit. (1)

31. (a) What do you mean by modulus of a counter ? (1)

(b) Draw the circuit diagram of a counter that counts from 0 to 9. (3)

32. (a) In TV picture is ________ modulated and sound is __________ modulated. (1)

(b) Draw the block diagram of TV receiver. (3)

33. (a) SIM stands for _______. (1)

(b) Explain the working of mobile communication with the help of block diagram. (3)

____________

SY-553 10

30. (a)   . (1)

(b)   waveform . (2)

(c)     . (1)

31. (a)  counter  modulus   ? (1)

(b) 0  9       . (3)

32. (a)     ________   __________
 . (1)

(b)  TV    . (3)

33. (a) SIM   _______. (1)

(b)     mobile communication 
 . (3)

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SY-553 11 P.T.O.

SY-553 12