TN 12th Question Paper 2022 Basic Electronics Engineering

No. of Printed Pages : 8
5983
!5983BasicElectronicsEngg! £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.

5983 2

1. £›©õØÖU Tmh¼ß Âv°ß £i :
(A) A+(B+C)=(A+B)+C (B) AB=BA
(C) A+B=B+A (D) A=A+A
According to commutative law of addition :
(a) A+(B+C)=(A+B)+C (b) AB=BA
(c) A+B=B+A (d) A=A+A

2. ö\²nº AvºöÁs GÀø» __________.
(A) 100 Hz •uÀ 30 kHz (B) 20 Hz •uÀ 20 kHz
(C) 88 MHz •uÀ 108 MHz (D) 30 Hz •uÀ 30 kHz
Audio frequency are within the range of __________.
(a) 100 Hz to 30 kHz (b) 20 Hz to 20 kHz
(c) 88 MHz to 108 MHz (d) 30 Hz to 30 kHz

3. H.G® •øÓ £µ¨¦u¼ß £møh AP»® __________.
(A) 20 kHz (B) 5 kHz (C) 100 kHz (D) 10 kHz
The bandwidth of AM transmission is __________.
(a) 20 kHz (b) 5 kHz (c) 100 kHz (d) 10 kHz

4. H.G®. ÁõöÚõ¼ Áõ[Q°ß Cøh{ø» AvºöÁs __________.
(A) 455 kHz (B) 10 kHz (C) 445 kHz (D) 100 kHz
The intermediate frequency of AM Radio receiver is __________.
(a) 455 kHz (b) 10 kHz (c) 445 kHz (d) 100 kHz

5. |øh÷£] __________ yµ® Áøµ ö\¯À£k®.
(A) 18 Q÷»õ «mhº (B) 27.2 Q÷»õ «mhº
(C) 60 Q÷»õ «mhº (D) 58 Q÷»õ «mhº
Walkie talkies works upto __________.
(a) 18 kilometers (b) 27.2 kilometers
(c) 60 kilometers (d) 58 kilometers

3 5983

6. •uÀ Aø»÷£]ø¯ PshÔ¢uÁº ¯õº ?
(A) \õ•÷ÁÀ F.B. ÷©õºì (B) ©õºmiß Põ¨£º
(C) öíß›a öíºmì (D) BÀ¤µm P÷µõì
Who invented the first mobile phone ?
(a) Samuel F.B. Morse (b) Martin Copper
(c) Henrich Hertz (d) Alfred Gross

7. £iP SÔ±mk JØøÓ •øÓ°À £¯ß£k® P®¤°ß Âmh® __________.
(A) 30 µm & 40 µm (B) 5 µm & 10 µm
(C) 2 µm & 5 µm (D) 1 µm & 20 µm
The core diameter of step index single mode is __________.
(a) 30 µm and 40 µm (b) 5 µm and 10 µm
(c) 2 µm and 5 µm (d) 1 µm and 20 µm

8. •uß•u¼À C¢v¯õÂÀ E¸ÁõUP¨£mh ö\¯ØøPz xønU÷PõÒ __________.
(A) PSLV - I (B) ì¦m{U & 2 (C) Bº¯£mhõ (D) B¨¤Ò
The first Indian artificial satellite was __________.
(a) PSLV - I (b) Sputnik - 2 (c) Aryabhata (d) Apple

9. CCTV Gߣx :

(A) ‰i¯z öuõø»zöuõhº¦ öuõø»UPõm]
(B) ‰i¯a _ØÖ öuõÈÀ~m£®
(C) ‰i¯a _ØÖ öuõø»UPõm]
(D) ‰i¯a _ØÖ öuõÈÀ~m£® ©ØÖ® PõönõÎ
What does CCTV stands for ?
(a) Closed Communication Television
(b) Closed Circuit Technology
(c) Closed Circuit Television
(d) Closed Circuit Technology and Video

5983 4

10. J¼ Aø»PÒ __________ £¯oUP •i¯õx.
(A) vµÁzvÀ (B) öÁØÔhzvÀ
(C) Áõ²UPÎÀ (D) vs©ö£õ¸ÎÀ
Sound waves do not travel through __________.
(a) Liquid (b) Vacuum
(c) Gases (d) Solid

11. J¼°ß Bµ®£ ¤µv£¼¨¦ __________ BS®.
(A) _zu©õÚ J¼ (B) Gvöµõ¼
(C) öuÎÁõÚ J¼ (D) Gvº •ÇUP®
__________ is early reflection of sound.
(a) Pure sound (b) Echo
(c) Intelligible sound (d) Reverberation

12. AC ªß \Uvø¯ DC ªß \Uv¯õP ©õØÖÁx __________.
(A) ªßÚÊzu Cµmi¨¦ (B) uø»RÇõUSuÀ
(C) ^µõUSuÀ (D) v¸zxuÀ
Conversion of AC power to DC power is __________.
(a) Voltage doubler (b) Inversion
(c) Regulation (d) Rectification

13. ªßÚÊzu ^µõUQ Gߣx __________.
(A) ^µõUP¨£hõu ªß÷Úõmh®
(B) Á¼ø©¯õÚ, |®£P©õÚ ©ØÖ® {ø»¯õÚ öÁαmk ªßÚÊzuzøu
u¸Áx
(C) SøÓ¢u vÓß öÁαk
(D) ^µõUP¨£hõu ªßÚÊzu®
A voltage regulator gives __________.
(a) Unregulated current
(b) A steady, reliable and fixed output voltage
(c) Low power output
(d) Unregulated voltage

5 5983

14. 8085 ~sö\¯»õUQ°À __________ Cøh³Ö \ªUøbPÒ EÒÍÚ.

(A) 3 (B) 9 (C) 6 (D) 5
There are __________ interrupt signals in 8085 microprocessor.
(a) 3 (b) 9 (c) 6 (d) 5

15. ‰øÍ Aø»PÒ ¤ßÁ¸® Aø»ÁiÁ •øÓPøÍU öPõskÒÍx.
(A) BÀL£õ, ¥mhõ, wmhõ ©ØÖ® öhÀhõ Aø»ÁiÁ •øÓPÒ
(B) BÀL£õ, wmhõ, ëmhõ ©ØÖ® öhÀhõ Aø»ÁiÁ •øÓPÒ
(C) BÀL£õ, ¥mhõ, Põ©õ ©ØÖ® öhÀhõ Aø»ÁiÁ •øÓPÒ
(D) ¥mhõ, wmhõ, Põ©õ ©ØÖ® öhÀhõ Aø»ÁiÁ •øÓPÒ
Brain waves comprise of __________.
(a) Alpha, Beta, Theta and Delta waveform patterns
(b) Alpha, Theta, Zeta and Delta waveform patterns
(c) Alpha, Beta, Gamma and Delta waveform patterns
(d) Beta, Theta, Gamma and Delta waveform patterns

£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. GøÁ÷¯Ý® ‰ßÖ Cøn¢u Áõ°ÀPøÍ GÊxP.
Write any three names of combinational gates.

17. £s¤ÓUP® GßÓõÀ GßÚ ?
What is demodulation ?

18. Áøµ¯Ö : Ãa_¨ £s÷£ØÓ®
Define Amplitude modulation.

5983 6

19. ÁõöÚõ¼ Áõ[Q°ß Ai¨£øhz uzxÁ[PÒ ¯õøÁ ?
What are the basic principles of radio receiver ?

20. GPS ©ØÖ® GPRS &ØS Cøh÷¯¯õÚ ÷ÁÖ£õk ¯õx ?
What is the major difference between GPS and GPRS ?

21. Aø»÷£]°ß £¯ß£õkPÒ ‰ßÔøÚ GÊxP.
Write three applications of cellphone.

22. JÎ CøÇPÎÀ EÒÍ EÖ¨¦PÒ ¯õøÁ ?
What are the basic elements of fiber optics ?

23. vÓß ÷£]PÎÀ G¢u ÁøP EnºÂPÒ ö£¸®£õ¾® £¯ß£kzu¨£kQßÓÚ ?
Hß ?
Which sensor is mostly used in smart phones ? Why ?

24. J¼ Aø»PÎß AÍĸUPøͨ £mi¯¼kP.
List the parameters of sound waves.

25. J¼ ©õ_U Pmk¨£kzu £¯ß£k® öuõÈÀ~m£[PÒ ¯õøÁ ?
What are the techniques used to control noise pollution ?

26. vÓß ªßÚq¯¼ß £¯ßPÒ ¯õøÁ ?
What are the applications of power electronics ?

27. BIOS GßÓõÀ GßÚ ?
What is BIOS ?

28. ªß\õµ® ©ØÖ® E°º ªß÷ÚõmhzvØS® Cøh°»õÚ ÷ÁÖ£õk ¯õx ?
What is the difference between electric and bio-electric current ?

7 5983

£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. £s÷£ØÓzvß ÷uøÁPÒ £ØÔ ÂÁ›UPÄ®.
What are the needs for modulation ?

30. Ex-OR, Ex-NOR Áõ°ÀPÎß Aø©¨¤øÚ²®, ö\¯À£õmiøÚ²® Esø©
AmhÁøn ‰»® ÂÁ›UPÄ®.
Explain in detail the construction of Ex-OR and Ex-NOR gate with truth table.

31. Aø»÷£]°ß •ß£UP/¤ß£UP ÷uõØÓzvß £h® Áøµ¢x £õP[PøÍU
SÔUPÄ®.
Draw the front and back panel of a cellphone and mention its parts.

32. JÎ CøÇUP®¤°ß AÝT»[PÒ ©ØÖ® ¤µvT»[PÒ ¯õøÁ ?
What are the advantages and disadvantages of OFC ?

33. ¤®£ ö\¯»õUPzvß £À÷ÁÖ ÁøPPøÍ ÂÍUPÄ®.
Explain the different types of image processing.

34. DC - AC ¦µmiø¯¨ £ØÔ _¸UP©õP GÊuÄ®.

Write short notes on DC to AC inverter.

35. uõ´£»øP°ß Aø©¨ø£ Áøµ£hzxhß ÂÍUSP.
Draw the schematic diagram of mother board and explain it.

5983 8

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

36. (A) ‰ßÖ Ai¨£øh §¼¯ß ÷uØÓ[Pøͨ £hzxhß ÂÁ›UPÄ®.
AÀ»x
(B) Ãa_ ©õØÔ £µ¨¤°ß (AM Radio transmitter) Pmh¨£h® Áøµ¢x
ÂÁ›UPÄ®.
(a) Explain the three basic Boolean laws with diagrams.
OR
(b) Draw and explain the block diagram of AM Radio transmitter.

37. (A) J¼°¯À ö£õÔ°¯¼ß £À÷ÁÖ £¯ß£õkPøÍ ÂÍUPÄ®.
AÀ»x
(B) SÐU÷Põì AÍ塧 (Glucometer) £h® Áøµ¢x ö\¯À£õmkU öPõÒøP
©ØÖ® £›÷\õuøÚ •øÓPøÍ ÂÁ›UPÄ®.
(a) Explain the various applications of Acoustic Engineering.
OR
(b) Discuss in detail the working principle and testing procedure of a Glucometer
with neat sketch.

-oOo-