Kerala Plus Two Question Paper 2024 Electronic Systems

Kerala Board

Question Paper
2024

Reg. No. : ......................................
SY-553 Name : ...........................................

SECOND YEAR HIGHER SECONDARY EXAMINATION, MARCH – 2024

Time : 2 Hours
Part – III Cool-off time : 15 Minutes
ELECTRONIC SYSTEMS
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. A spike waveform can be generated from a square waveform in _____ circuit.
(Integrator, Differentiator, Clipper, Clamper)

2. In _____ more than 20,000 transistors are included on a single chip.
(SSI, MSI, LSI, VLSI)

3. CMRR stands for _____ .

4. How many OR Gates are present in the output of a 4:1 multiplexer ?
(4, 2, 8, 1)

5. In satellite communication transmission of signals from first earth station to satellite
through a channel is called _______.
(down link, up link, duplexer, antenna)

6. The basic principle behind the fibre optic communication is _____ .
(Critical angle, Electromagnetic induction, Total internal reflection, Refraction)

Answer any 11 questions from 7 to 18. Each carries 2 scores. (11  2 = 22)
7. Define clipper & clamper.

8. (a) Draw the frequency response of RC low pass filter. (1)
(b) Write the expression for cut-off frequency. (1)

9. Compare +ve feedback and –ve feedback.

10. (a) Name an Op-amp IC. (1)
(b) Draw its Pin diagram. (1)

11. Draw the block diagram of linear power supply.

12. Draw the block diagram of an SMPS and explain its working.

13. Compare On-line UPS and Off-line UPS.

SY-553 2

1  6   5  . 1 
. (5  1 = 5)
1.  square waveform-   spike waveform generate  circuit 
_______.
(Integrator, Differentiator, Clipper, Clamper)

2. 20,000   transistors  chip –   IC _______ .
(SSI, MSI, LSI, VLSI)

3. CMRR   _____ .

4.  4:1 multiplexer –  out put –   OR Gates  ?
(4, 2, 8, 1)

5.  satellite communication   earth station-  satellite 
signal- transmit  channel  _______ .
(down link, up link, duplexer, antenna)

6.  fibre optic communication –     _____ .
(Critical angle, Electromagnetic induction, Total internal reflection, Refraction)

7  18   11   . 2 
. (11  2 = 22)
7. Clipper  clamper   .

8. (a) RC low pass filter –  frequency response . (1)
(b)  cut-off frequency  expression . (1)

9. +ve feedback  –ve feedback   .

10. (a)  Op-amp IC   . (1)
(b)  Pin diagram . (1)

11.  linear power supply  block diagram .

12.  SMPS- block diagram    .

13. On-line UPS  Off-line UPS   .

SY-553 3 P.T.O.

14. (a) A 4:1 multiplexer has _____ no. of select lines. (1)
(b) Draw the block diagram of 4:1 multiplexer. (1)

15. Define Decoder and write any one use.

16. Compare TTL & CMOS in logic families.

17. Draw the block diagram of PA system.

18. (a) Define word length in a microprocessor. (1)
(b) Give one example for 8-bit microprocessor. (1)

Answer any 7 questions from 19 to 27. Each carries 3 scores. (7  3 = 21)
19.

(a) Name the given circuit. (1)
(b) Draw its o/p waveform. (1)
(c) Explain its working. (1)

1
20. If oscillator frequency is f =
2 6RC
(a) Identify the oscillator. (1)
(b) Draw its circuit diagram. (2)

21. What are the different steps in IC fabrication techniques ?

Rf
22. Draw the circuit diagram of an Op-amp with voltage gain 1 + .
R1

23. (a) What is the working principle of moving coil microphone ? (1)
(b) Draw the constructional details of moving coil microphone. (2)
SY-553 4

14. (a)  4:1 multiplexer -    select lines . (1)
(b) 4:1 multiplexer –  block diagram . (1)

15. Decoder .    .

16. Logic families  TTL  CMOS   .

17. Public Address System  block diagram .

18. (a)  microprocessor  word length . (1)
(b)  8-bit microprocessor   . (1)

19  27    7  .
3  . (7  3 = 21)
19.

(a)  circuit   . (1)
(b)  o/p waveform . (1)
(c)   . (1)

1
20. Oscillator frequency f = 
2 6RC
(a)  oscillator  . (1)
(b)  circuit diagram . (2)

21. IC fabrication techniques    .

Rf
22. Voltage gain 1 +
R1
   Op-amp –  circuit diagram
.

23. (a)  moving coil microphone -    . (1)
(b)  moving coil microphone -  constructional details . (2)

SY-553 5 P.T.O.

24. Explain satellite communication with neat block diagram.

25. Compare step index and graded index fiber.

26. Draw the block diagram of BP apparatus.

27. (a) In shift register _____ flip-flop are used. (1)
(b) Draw the logic diagram of 4 bit SISO shift register. (2)

Answer any 3 questions from 28 to 32. Each carries 4 scores. (3  4 = 12)
28. (a) Draw the circuit diagram to obtain the given o/p waveform. (2)
(b) Identify the circuit diagram. (1)
(c) Explain the working. (1)

29. (a) An Astable multivibrator has _____ stable state. (1)
(b) Draw the circuit diagram of an astable multivibrator using IC 555. (3)

30. (a) The modulus of a decade counter is _____ . (1)
(b) Draw the block diagram of a decade counter. (2)
(c) Write its truth table. (1)

31. Draw the block diagram of monochrome TV Receiver.

32. (a) Write any one operating system used in mobile phones. (1)
(b) Draw the block diagram of RADAR. (2)
(c) What is the function of duplexer in RADAR ? (1)

_____________
SY-553 6

24. Satellite communication  neat block diagram  explain .

25. Step index  graded index fiber    .

26.  BP apparatus  Block diagram .

27. (a)  shift register _____ flip-flop  . (1)
(b) 4 bit SISO shift register  logic diagram . (2)

28  32    3  .
4  . (3  4 = 12)
28. (a)   o/p waveform  circuit diagram
. (2)
(b) circuit diagram  . (1)
(c)   . (1)

29. (a)  Astable multivibrator  _____ stable state . (1)
(b)  Astable multivibrator –  circuit diagram IC 555  . (3)

30. (a)  decade counter  modulus _______ . (1)
(b)  decade counter  block diagram . (2)
(c)  truth table . (1)

31.  monochrome TV Receiver  block diagram .

32. (a) Mobile phone –     operating system – 
 . (1)
(b) RADAR –  block diagram . (2)
(c) RADAR –  duplexer    ? (1)

_____________

SY-553 7 P.T.O.

SY-553 8

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