TN 12th Question Paper 2023 Basic Electronics Engineering

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 8
6683
!6683BasicElectronicsEngg! £vÄ Gs
Register Number

Part III — Vocational Subjects
Ai¨£øh ªßÚq ö£õÔ°¯À
BASIC ELECTRONICS ENGINEERING
( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version )

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 90
Time Allowed : 3.00 Hours ] [ Maximum Marks : 90

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP £vÁõQ EÒÍuõ GߣuøÚ \›£õºzxU
öPõÒÍÄ®. Aa_¨£v¨¤À SøÓ°¸¨¤ß AøÓU PsPõo¨£õÍ›h®
EhÚi¯õPz öu›ÂUPÄ®.
(2) }»® AÀ»x P¸¨¦ ø©°øÚ ©mk÷© GÊxÁuØS®
AiU÷PõikÁuØS® £¯ß£kzu ÷Ásk®. £h[PÒ ÁøµÁuØS
ö£ß]À £¯ß£kzuÄ®.
Instructions : (1) Check the question paper for fairness of printing. If there is any lack of
fairness, inform the Hall Supervisor immediately.
(2) Use Blue or Black ink to write and underline and pencil to draw
diagrams.

£Sv & I/PART – I

SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 15x1=15

(ii) öPõkUP¨£mkÒÍ ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯ Âøhø¯z
÷uº¢öukzxU SÔ±mkhß Âøh°øÚ²® ÷\ºzx GÊuÄ®.
Note : (i) Answer all the questions.

(ii) Choose the most appropriate answer from the given four alternatives
and write the option code and the corresponding answer.

[ v¸¨¦P / Turn over

6683 2

1. £[Rmk Âv°ß£i __________.
(A) A(AB)=AAB (B) A(B+C)=AB+AC
(C) A+AB=A (D) A(BC)=ABC
According to Distributive Law :
(a) A(AB)=AAB (b) A(B+C)=AB+AC
(c) A+AB=A (d) A(BC)=ABC

2. ÷µhõ›À £¯ß£k® H¢÷uo __________.
(A) Áøͯ H¢÷uo (B) ~sxsk H¢÷uo
(C) öPõ®¦ H¢÷uo (D) Ámk H¢÷uo
__________ antenna is used in Radar.
(a) Loop (b) Microstrip
(c) Horn (d) Dish

3. GL¨.G®. •øÓ £µ¨¦u¼ß £møh AP»® __________ BS®.
(A) 100 kHz (B) 10 kHz (C) 200 kHz (D) 20 kHz
The bandwidth of FM Transmission is __________.
(a) 100 kHz (b) 10 kHz (c) 200 kHz (d) 20 kHz

4. öuõø»UPõm]°ß Qøh{ø» AvºöÁs :
(A) 625 Hz (B) 25 Hz (C) 15625 Hz (D) 50 Hz
The Horizontal frequency of Television receiver is __________.
(a) 625 Hz (b) 25 Hz (c) 15625 Hz (d) 50 Hz

5. |øh÷£] __________ £møh AP»zvÀ ÷Áø» ö\´QÓx.
(A) 27 MHz (B) 7 kHz (C) 25 MHz (D) 18-20 kHz
Walkie talkie works on __________ bandwidth.
(a) 27 MHz (b) 7 kHz (c) 25 MHz (d) 18-20 kHz

6. ÷©®£kzu¨£mh GPRS __________ GÚ AøÇUP¨£kQÓx.
(A) 0 G (B) EDGE (C) 3 G (D) 2.5 G
Enhanced GPRS is called as __________.

(a) 0G (b) EDGE (c) 3G (d) 2.5 G

3 6683

7. ÷\õÚõº __________ uzxÁzøu¨ £¯ß£kzv }›ß Ai°À J¼¯ø»PøÍ
Aݨ¤a ö\¯À£kQßÓx.
(A) Gvöµõ¼ (B) ªßPõ¢u®
(C) £µì£µ ªßyshÀ (D) ªß÷|õUQ
SONAR works on __________ principle by sending out sound waves under water.

(a) Echo (b) Electromagnetic

(c) Mutual Inductance (d) Electromotive

8. {»|kUP ÁøµÂ Gߣx __________ IU Psk¤izx £vÄ ö\´²® J¸
P¸Â¯õS®.
(A) _Úõª (B) ÁõÛø»
(C) C¯ØøP ÁÍ® (D) §P®£®
A seismograph is an instrument used to detect and record __________.

(a) Tsunami (b) Weather

(c) Natural resources (d) Earthquake

9. J¸ £hzvß ªPa ]Ô¯ TÖ __________ GÚ AøÇUP¨£kQÓx.
(A) B¯•øÓ (B) £h¨¦ÒÎ (C) C»UP® (D) ¦ÒÎ
The smallest element of an image is called as __________.

(a) co-ordinate (b) pixel (c) digit (d) dot

10. £» ¤µv£¼¨¦PÒ __________ GÚ AøÇUP¨£kQßÓÚ.
(A) uøh (B) Gvº •ÇUP[PÒ
(C) AÊzu® (D) »PÀ
Multiple reflections are called as __________.

(a) Resistance (b) Reverberations

(c) Compression (d) Refraction

[ v¸¨¦P / Turn over

6683 4

11. DC-DC ©õØÔPÒ Gߣx __________.

(A) DC &I AC &¯õP ©õØÖÁx
(B) AC &I DC &BP ©õØÖÁx
(C) AC &IU SøÓUQÓx
(D) DC ªßÚÊzuzøu £À÷ÁÖ AÍÄÒÍ DC ªßÚÊzu©õP ©õØÖÁx
DC-DC Converters __________.
(a) Convert DC to AC
(b) Convert AC to DC
(c) Reduce AC
(d) Convert DC voltage into different DC voltage levels

12. Bºi²÷ÚõÂÀ öÁΨ¦Ó ‰»zv¼¸¢x __________ ÷ÁõÀm ªß\Uv
ö£Ó¨£kQÓx.
(A) 9 (B) 3.3 (C) 24 (D) 5
The voltage received from the output source in Arduino is __________ volts.

(a) 9 (b) 3.3 (c) 24 (d) 5

13. ªßÚq¯À ©¸zxÁ \õuÚ[PÎÀ Põ¢u Jzvø\Ä E¸ÁøµÂ (M.R.I) Gߣx
__________ ~m£zøua \õº¢ux.

(A) AqUP¸ (B) A¯Û¯õUPÀ
(C) PvºÃa_ (D) A¯Û¯À»õu
In Medical Electronic equipments, Magnetic Resonance Imaging (M.R.I) is a
__________ technique.
(a) Nuclear (b) Ionizing
(c) Radiation (d) Non-Ionising

14. ªß Cu¯ ÁøµÂ°À __________ ªß•øÚ öuõSvPÒ EÒÍÚ.
(A) Gmk (B) ‰ßÖ (C) £Ûöµsk (D) |õßS
In Electro Cardio Gram (ECG) __________ leads are used.

(a) 8 (b) 3 (c) 12 (d) 4

5 6683

15. J¸ 8 ¤m GÀ.C.i. öuõø»UPõm]°À £aø\ Ásn \ªUøbPÒ __________
C»UP ÁøP Aø»PÍõP ©õØÓ¨£kQßÓÚ.
(A) G0 &¼¸¢x G2 Áøµ (B) G0 &¼¸¢x G7 Áøµ
(C) G0 &¼¸¢x G3 Áøµ (D) G0 &¼¸¢x G1 Áøµ
In an 8 bit L.E.D. TV, Green colour signal is converted into __________ digital
signals.
(a) G0 to G2 (b) G0 to G7
(c) G0 to G3 (d) G0 to G1

£Sv & II / PART - II

SÔ¨¦ : GøÁ÷¯Ý® £zx ÂÚõUPÐUS ©mk® Âøh¯ÎUPÄ®. AÁØÔÀ ÂÚõ
Gs 28 &US Pmhõ¯©õP Âøh¯ÎzuÀ ÷Ásk®. 10x3=30

Note : Answer any ten of the following questions. Question No. 28 is compulsory.

16. Áøµ¯ÖUPÄ® : SÔ¯õUQ
Define Encoder

17. C¸© GsPÎÀ J¸ Gsøn GÆÁõÖ ÷\ªUP»õ® ?
How do you store one bit in binary numbers ?

18. £s÷£ØÓ® – Áøµ¯ÖUPÄ®.
Define modulation.

19. ]Ö SÔ¨¦ ÁøµP – £s÷£ØÔÓUQ.
Write short notes on MODEM.

20. J¸ ÁõöÚõ¼ Hؤ°À "í®' Hß HØ£kQÓx ? AuØPõÚ ‰ßÖ Põµn[PøÍ
GÊxP.

Why hum occurs in a radio receiver ? Give three reasons for it.

[ v¸¨¦P / Turn over

6683 6

21. £›©õØÓ •øÓ°ß ÁøPPøÍ GÊxP.
Write the types of transmission modes.

22. JÎ CøÇU P®¤°ß ÁøPPÒ ¯õøÁ ?
What are the types of Optical Fiber Cable ?

23. CCTV Aø©¨¤ß £¯ßPÒ GøÁ÷¯Ý® ‰ßÔøÚ GÊuÄ®.

Write down any three uses of CCTV system.

24. ö\¨ ö£õÔ°ß |ßø©PÒ ¯õøÁ ?
What are the advantages of Headphones ?

25. •ußø©/•UQ¯ {øÚÁPzvß £s¦PÒ H÷uÝ® ‰ßÔøÚ GÊxP.
Write any three characteristics of primary/main memory.

26. 7805 GßÓ ‰ßÖ •øÚPÒ öPõsh ªßÚÊzu ^µõUQ°ß £h® Áøµ¢x
•øÚPÎß Â£µ[PøÍ ©mk® GÊxP. (_ØÖ¨£h® Áøµ¯z ÷uøÁ°Àø»)
Draw a three pin voltage regulator 7805 and write the pin details only. (No need
to draw circuit diagram).

27. ªß Cu¯ ÁøµÂ°ß (ECG) £¯ß£õkPøÍ GÊxP.
Write the advantages of Electro Cardiograph (ECG).

28. P»UQ¨ ¤›US® Hؤ°ß uzxÁzvøÚ GÊxP.

Write down the principle of Super heterodyning.

7 6683

£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® I¢x ÂÚõUPÐUS ©mk® Âøh¯ÎUPÄ®. AÁØÔÀ ÂÚõ
Gs 35 &US Pmhõ¯©õP Âøh¯ÎzuÀ ÷Ásk®. ÷uøÁ¯õÚ Ch[PÎÀ
£h[PÒ ÁøµP. 5x5=25
Note : Answer any five questions. Question No. 35 is compulsory. Draw diagrams
wherever necessary.

29. C¸© GsPÎÀ EÒÍ Cµsk GsPøÍ GÆÁõÖ uºUP Áõ°¼ß ‰»® Tmh»õ®
Gߣøu¨ £hzxhß ÂÁ›UPÄ®.
If any two bits are to be added, how it can be done through logic gate ? Justify
with necessary diagrams.

30. ¯õQ Ehõ H¢÷uo £ØÔ ÂÁ›UPÄ®.
Explain Yagi Uda Antenna.

31. ÁõöÚõ¼ Hؤ°ß £À÷ÁÖ vÓßPøÍ ÂÁ›UPÄ®.
Describe the various abilities of radio receiver.

32. ÷µhõ›ß £¯ßPÒ ¯õøÁ ?
What are the uses of RADAR ?

33. CCD ©ØÖ® CMOS EnºÂPøÍ J¨¤kP.

Compare CCD and CMOS Sensors.

34. Cµzu AÊzu©õÛ°ß (BP Monitor) ö\¯À£õmiøÚ SÔzx ]Ö SÔ¨¦ GÊxP.
Write short notes on the operation of Blood Pressure Monitor.

35. £Qµø»°ß ÁøPPøÍ ÂÁ›UPÄ®.

Explain the types of HOTSPOT.

[ v¸¨¦P / Turn over

6683 8

£Sv & IV / PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. ÷uøÁ¯õÚ Ch[PÎÀ £h®
ÁøµP. 2x10=20
Note : Answer all the questions. Draw diagrams wherever necessary.

36. (A) •ÊU Tmia _ØÔß £h® Áøµ¢x Esø© AmhÁøn ‰»® ÂÁ›UPÄ®.
AÀ»x
(B) |ÃÚ L.E.D öuõø»UPõm]PÎß uµ® ©ØÖ® £Êx£õºzuÀ £ØÔ ÂÁ›UPÄ®.
(a) Explain Full adder circuit with diagram and truth table.
OR
(b) Explain the resolution and servicing of modern LED TV receivers.

37. (A) H÷uÝ® I¢x ö\¯ØøPU ÷PõÒPÒ £ØÔ ÂÁ›UPÄ®.
AÀ»x
(B) uõ´¨ £»øP°ß •UQ¯ £SvPÒ H÷uÝ® I¢vøÚ ö\¯À£õkPÐhß
ÂÁ›UPÄ®.
(a) Explain about any five artificial satellites.
OR
(b) Explain the functions of any five major motherboard components and their
functions.

-oOo-