Kerala Plus One Question Paper 2023 Electronic System

FIRST YEAR

Kerala Board
Question Paper
2023

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Reg. No. : ......................................
Name : ...........................................
FY-453
FIRST 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  ‘  ’ .
 ‘  ’    
 .
      .
    .
  , , ,   
.
   .
    .
     
    .

FY-853 1 P.T.O.

Answer any 5 questions from 1 to 6. Each carries 1 score. (5  1 = 5)

1. Three 6 resistors are connected in parallel. The effective resistance is ________.

(6, 3, 2, 10)

2. Select the polarised capacitor from the given set.

(10 kpF, 100 pF, 100 F, 10 pF)

3. The barrier potential of silicon diode is ________.

(1.12 V, 0.7 V, 0.2 V, 0.3 V)

4. The suitable configuration for amplifier is ________.

(CE, CC, CB, CD)

5. Astable multivibrator has ________stable states.

(2, 1, 0, 3)

6. A · A = ________.

(A, 0, 1, A )

Answer any 11 questions from 7 to 19. Each carries 2 scores. (11  2 = 22)

7. Write 2 applications of Electronics in defence field.

8. Write the resistance values of the given colour coded resistors.

(1) Brown, Red, Orange, Silver (1)

(2) Brown, Green, Black, Gold (1)

FY-453 2

1  6    5  .
1  . (5  1 = 5)

1. 6 resistance  3 resistors parallel  . 
 resistance value ________ .
(6, 3, 2, 10)

2.   polarised   .
(10 kpF, 100 pF, 100 F, 10 pF)

3.   barrier potential ________ .
(1.12 V, 0.7 V, 0.2 V, 0.3 V)

4.    configuration ________ .
(CE, CC, CB, CD)

5.    ________stable states  .
(2, 1, 0, 3)

6. A · A = ________.
(A, 0, 1, A )

7  19    11  .
2  . (11  2 = 22)
7.    Electronics-   .

8.     resistors  resistance  .
(1) Brown, Red, Orange, Silver (1)
(2) Brown, Green, Black, Gold (1)

FY-453 3 P.T.O.

9. Draw the energy band diagram of Aluminium and Silicon.

10. Compare P type and N type semi-conductors.

11. Draw the VI characteristics curve of silicon diode. Mark the knee voltage and break
down voltage.

12. Write the need of a rectifier circuit.

13. Draw the symbol and structure of PNP transistor.

14. Draw the basic CE configuration of a NPN transistor and mark input and output voltage
and current.

15. (a) Name the best biasing circuit. (1)

(b) Draw the circuit. (1)

16. Draw the symbol and write one application of LDR.

17. State De Morgan’s theorems.

18. You are provided a Galvanometer and resistor. How will you convert the Galvanometer
into voltmeter.

19. Draw the block diagram of TDM.

FY-453 4

9.   energy band  .

10. P type  N type  semi-conductor   .

11.    VI characteristics  knee voltage  break down
voltage  .

12. Rectifier circuit   .

13.  PNP  symbol   .

14.  NPN  CE configuration  input  output  voltage
 current  .

15. (a)      . (1)

(b)  . (1)

16. LDR  symbol .   .

17. De Morgan’s theorems .

18.   Galvanometer  resistor  .  Galvanometer 
voltmeter  

19. TDM    .

FY-453 5 P.T.O.

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

20. (a) State Ohms law. (1)

(b) Find the current flowing through the given circuit. (2)

21. (a) The working principle of transformer is ________. (1)

(b) The turns ratio of a transformer is 10 : 1. Calculate the secondary voltage if the
primary voltage is 230 V, 50 Hz. Write the voltage and frequency of Secondary. (2)

22. (a) Name the different types of break down that occurs in PN Junction. (1)

(b) Compare them. (2)

23. Compare the three transistor configurations.

24. (a) Draw the structure of N channel JFET. (1)

(b) Draw the symbol of P channel MOSFET and write one application. (2)

25. (a) The transistor is operated in _________ region to work as an amplifier. (1)

(b) Draw the circuit of a single stage RC coupled amplifier. (2)

26. (a) Draw the circuit diagram of a square wave generator. (2)

(b) Draw the output wave form. (1)

FY-453 6

20  28    7  .

3  . (7  3 = 21)
20. (a) Ohms law . (1)

(b)    current I . (2)

21. (a) Transformer    ________ . (1)

(b)   turns ratio 10 : 1 . Primary voltage 230 V,
50 Hz  Secondary voltage   . (2)

22. (a)  PN Junction-   break down  
. (1)

(b)   . (2)

23.   configurations  .

24. (a)  N  JFET   . (1)

(b) P  MOSFET  symbol ,   . (2)

25. (a)      _________ 
. (1)

(b)    RC    . (2)

26. (a) Square wave    . (2)

(b) output wave form . (1)

FY-453 7 P.T.O.

27. (a) Name universal gates. (1)

(b) Realize the basic gates using NOR gate. (2)

28. Write the needs of modulation.

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

29. (a) State KCL. (1)

(b) Calculate the value of I3 in the given network. (3)

30. (a) PIV of a diode used in a rectifier circuit is 2 Vm. Identify the rectifier circuit. (1)

(b) Draw the above circuit. (3)

31. (a) Write the conditions of a biasing circuit. (3)

(b) Write the function of emitter resistor RE in the amplifier circuit. (1)

FY-453 8

27. (a)    . (1)

(b) NOR gate    . (2)

28.   .

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

4  . (3  4 = 12)

29. (a) KCL . (1)

(b)  network  I3   . (3)

30. (a)      PIV 2 Vm
.   . (1)

(b)  . (3)

31. (a)     . (3)

(b)  amplifier    RE  function . (1)
FY-453 9 P.T.O.

32. Simplify using K map.

y = (1, 3, 5, 7, 8, 9, 10, 11)

33. (a) Draw the bock diagram of CRO. (3)

(b) Write two applications of CRO. (1)

___________

FY-453 10

32. K map  .

y = (1, 3, 5, 7, 8, 9, 10, 11)

33. (a) CRO    . (3)

(b) CRO    . (1)

___________

FY-453 11 P.T.O.

FY-453 12