Kerala Plus One Question Paper 2024 Electronic System

Kerala Board

Question Paper
2024

Reg. No. : ......................................
FY-453 Name : ...........................................

FIRST YEAR HIGHER SECONDARY EXAMINATION, MARCH 2024

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-453 1 P.T.O.

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

1. The main supply used for residential purposes has a frequency of 50 Hz, its time period
is _______.

(0.02 s, 0.01 s, 0.5 s, 0.1 s)

2. The size of a resistor _______ with power rating.

(increases, decreases, is equal, none of these)

3. Pinch off voltage is related to _______.

(SCR, JFET, BJT, MOSFET)

4. ________ power amplifier has highest efficiency.

(Class A, Class B, Class AB, Class C)

5. Identify the symbol of varactor diode from the following :

––
6. Y = AB is logically equivalent to ________ gate.

(OR, NAND, NOT, AND)

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

7. Define the following terms :

(a) Time period (1)

(b) Frequency (1)

FY-453 2

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

1.   main supply   50 Hz .
 time period _______ .

(0.02 s, 0.01 s, 0.5 s, 0.1 s)

2.   size power rating  _______ .

(increases, decreases, is equal, none of these)

3. Pinch off voltage _______  .

(SCR, JFET, BJT, MOSFET)

4.   efficiency    ________ .

(Class A, Class B, Class AB, Class C)

5.    varactor  symbol  :

––
6. Y = AB    ________ .

(OR, NAND, NOT, AND)

7  18    11  .
2  . (11  2 = 22)

7.    :

(a) Time period (1)
(b) Frequency (1)
FY-453 3 P.T.O.

8. Write the colour coding of the following resistors :

(a) 2.2 k + 5% (1)

(b) 560  + 10% (1)

9. Draw the energy band diagrams of semiconductor and metal.

10. Compare N type and P type semiconductors.

11. (a) What is the need of voltage regulation ? (1)

(b) Which IC can be used for providing +12 V ? (1)

12. “For proper amplification operating point must be at the centre of the DC load line.”

(a) State true or false. (1)

(b) Justify the statement. (1)

13. Compare voltage amplifier and power amplifier.

14. Draw the symbol and one application of SCR and LDR.

15. Draw the circuit diagram of a half adder. Write its truth table.

16. Write any two uses of function generator.

17. Draw the block diagram of TDM.
FY-453 4

8.    colour coding  :

(a) 2.2 k + 5% (1)

(b) 560  + 10% (1)

9.      .

10. N-  P-  .

11. (a)    ? (1)

(b) +12 V  IC  ? (1)

12. “  operating point, DC   
.”

(a)    . (1)

(b) Statement  . (1)

13.     .

14. SCR  LDR  symbol   application  .

15.  half adder    .  truth table .

16.  function generator    .

17. TDM  block diagram .

FY-453 5 P.T.O.

18. (a) Define frequency modulation. (1)

(b) Draw the FM modulated waveform. (1)

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

19. Find the effective values of the following circuits :

(a) (1)

(b) (1)

(c) (1)

20. (a) The cut-in voltage of a silicon diode is ______. (1)

(b) Draw the circuit arrangement to find the V-I characteristics of a diode. (2)

21. Identify the symbols :

(a) (1)

(b) (1)

(c) (1)

22. (a) Transistor acts as an open switch in ________ region. (1)

(b) Draw the circuit diagram and output waveform of a transistor as a switch. (2)
FY-453 6

18. (a)   . (1)
(b)  FM   . (1)

19  27    7  .
3  . (7  3 = 21)
19.    effective values  :

(a) (1)

(b) (1)

(c) (1)

20. (a)    cut-in voltage ______ . (1)
(b)   V-I characteristics   . (2)

21.   :

(a) (1)

(b) (1)

(c) (1)

22. (a)   open switch   ________
. (1)

(b)        
  . (2)
FY-453 7 P.T.O.

23. Compare avalanche breakdown and zener breakdown.

24. What is the need of biasing in transistor amplifier ?

25. (a) An astable multivibrator has _______ stable state. (1)

(b) Draw the circuit diagram and output waveform. (2)

26. With the help of a diagram show how to convert a galvanometer into a voltmeter.

27. Reduce the given expression using K-map

y = (m0, m1, m2, m3, m6, m10, m14)

Answer any 3 questions from 28 to 32. Each carries 4 scores. (3  4 = 12)

28. (a) State KVL. (2)

(b) Find the value of I from the given circuit : (2)

29. (a) The maximum efficiency of a full wave rectifier is _________. (1)

(b) Explain the working of a centre tapped rectifier with a neat diagram. (3)

30. (a) FET is a _______ controlled device. (1)

(b) Explain the working of an N channel JFET. (3)

FY-453 8

23.      
.

24.  transistor     ?

25. (a)    _______ stable state  . (1)
(b)      
. (2)

26.      
   .
27.  expression K-map  .
y = (m0, m1, m2, m3, m6, m10, m14)

28  32    3  .
4  . (3  4 = 12)

28. (a) KVL . (2)
(b)    I    : (2)

29. (a)      efficiency _________ . (1)
(b)  centre tapped     . (3)

30. (a) FET   _______ . (1)
(b)  N-channel JFET   . (3)

FY-453 9 P.T.O.

31. (a) Draw the frequency response of an RC coupled amplifier. (2)

(b) Draw the DC load line and mark Q points for class A, class B, class C and class
AB power amplifiers. (2)

32. (a) State De-morgan’s theorems. (2)

(b) Realize EX-OR using NAND. (2)

___________

FY-453 10

31. (a)  RC coupled    . (2)

(b)  DC load line   class A, class B, class C, class AB 
 Q point  . (2)

32. (a) De-morgan’s  . (2)

(b) NAND  EX-OR . (2)

___________

FY-453 11 P.T.O.

FY-453 12