TN 12th Question Paper 2023 Basic Electrical Engineering

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 8
6682
!6682BasicElectEnginee! £vÄ Gs
Register Number

Part III — Vocational Subjects
Ai¨£øh ªß ö£õÔ°¯À & P¸zv¯À
BASIC ELECTRICAL ENGINEERING - THEORY
( 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

6682 2

1. ¤ßÁ¸® Â{÷¯õP •øÓPÎÀ ö£õxÁõP £¯ß£hõux Gx ?
(A) 3 •øÚ & 3 Phzv (B) 3 •øÚ & 4 Phzv
(C) J¸ •øÚ & 4 Phzv (D) J¸ •øÚ & 3 Phzv
Which of the following is not the distribution system normally used ?
(a) 3 phase - 3 wire (b) 3 phase - 4 wire
(c) Single phase - 4 wire (d) Single phase - 3 wire

2. ö£¸®£õ¾® ªß £Qº©õÚzvØS £¯ß£kzu¨£k® Phzv :
(A) A¾ªÛ¯®
(B) GLS
(C) Á¾¨£kzu¨£mh GLShß Ti¯ A¾ªÛ¯®
(D) uõªµ®
The Conductor which is widely used for power transmission :
(a) Aluminium
(b) Steel
(c) Aluminium Conductor with Steel Reinforcement (ACSR)
(d) Copper

3. Jκ •øÚ ÂÍUSPÎÀ 900 ¿©ÝUS \©©õÚ AÍÄ :
(A) 0.016 Áõmì (B) 15 Áõmì
(C) 0.0016 Áõmì (D) 0.16 Áõmì
In LED Lamps, 900 lumens is equal to :
(a) 0.016 watts (b) 15 watts
(c) 0.0016 watts (d) 0.16 watts

4. }º `÷hØÖ® P»ÛÀ ÁiPõÀ SÇõ°ß £¯ß :
(A) £Êx £õºUS®÷£õx •Ê }øµ²® öÁÎ÷¯ØÓ
(B) öÁ¢}øµ öÁÎ÷¯ØÓ
(C) AÊzuzøu APØÓ
(D) }øµ EÒ÷Í ö\¾zu
The use of vent pipe in Geyser :
(a) to drain the water completely during the repairing time
(b) to let out the hot water

(c) to release the pressure
(d) to let the water inside

3 6682

5. öÁs_hº ÂÍUQß ªß CøǯõÚx :
(A) Põº£ß (B) h[ìhß (C) A¾ªÛ¯® (D) ö\®¦
The filament of incandescent lamp is __________.
(a) Carbon (b) Tungsten (c) Aluminium (d) Copper

6. G¢u \õuÚzvÀ öÁ¨£U P®¤a _¸ÐUS ÷©À ]Ô¯ }ºzöuõmi Aø©UP¨&
£mkÒÍx ?
(A) Põ¤ ö£ºS÷»mhº
(B) AÊzu ÁøP }º `÷hØÖ® P»ß
(C) ªß £ØÓ øÁ¨£õß
(D) }µõ ªß ÷u´¨¦¨ ö£mi
In which appliance, a small water tank is kept over the heating element ?
(a) Coffee percolator
(b) Pressure type geyser
(c) Electric soldering iron
(d) Steam iron box

7. ªÛ÷¯a\º ªß_ØÖ xsi¨£õß __________ AÍÄ ªß_ØÖPÐUS HØÓx.
(A) 3000 B®¤¯º (B) 1000 B®¤¯º
(C) 2000 B®¤¯º (D) 100 B®¤¯º
The miniature Circuit Breaker is suitable for electrical circuit having __________
current rating.
(a) 3000 Ampere (b) 1000 Ampere
(c) 2000 Ampere (d) 100 Ampere

8. ¦øP ©ØÖ® y_U PõØøÓ öÁÎ÷¯ØÓ EuÄ® ªßÂ]Ô :
(A) uõ[Q SÇõ´ ªßÂ]Ô (B) Tøµ ªßÂ]Ô
(C) öÁΨ¦Ó® uÒЮ ªßÂ]Ô (D) ÷©ø\ ªßÂ]Ô
Which type of fan is used to release smoke and dust ?
(a) Pedestal fan (b) Ceiling fan
(c) Exhaust fan (d) Table fan

9. RÌPshøÁPÎÀ £vÄ P¸Â Gߣx __________.
(A) Áõm ©o AÍ (B) B®¤¯º ©o AÍÂ
(C) G»Um÷µõ Põºi÷¯õ Qµõ® (D) ªßPõ¨¦ AÍÂ
Which one is Recording Instrument ?
(a) Watt hour meter (b) Ampere hour meter

(c) Electrocardiogram (d) Megger

[ v¸¨¦P / Turn over

6682 4

10. uÛ|£º ªßÛ¯UQPÒ __________ CÀ ö£›x® £¯ß£kQÓx.
(A) ªß £Ð yUQ (B) PoÛPÒ
(C) öám £®¨ (D) öÁØÔhz y´ø©¯õUQ
The individual drive is used in :
(a) cranes (b) computers
(c) jet pump (d) vacuum cleaner

11. JÎ ªßÚÊzuUP»Ûß |ßø© :
(A) ©õ_ HØ£hõx
(B) SøÓÁõÚ xÁUP ö\»Ä
(C) ªP¨ö£›¯ ªßP» AkUSPÒ ÷uøÁ°Àø»
(D) SøÓÁõÚ Ch® ÷uøÁ
The advantage of photo voltaic cell is :
(a) Pollution free
(b) Low initial cost
(c) No need for large battery bank
(d) Needs less space

12. {»UP]Ä ªß_ØÖ xsi¨£õß, ªß_ØøÓ __________ ö|õi°À xsiUQÓx.
(A) 0.5 (B) 1 (C) 0.7 (D) 0.1
The earth leakage circuit breaker breaks the circuit in __________ seconds.

(a) 0.5 (b) 1 (c) 0.7 (d) 0.1

13. •Ê _¸Îøhzyµ EÀø»°À J¸ _¸Îß C¸ £UP[PÐUS Cøh÷¯ EÒÍ
ªßÛ¯À ÷Põn® :
(A) 1808 (B) 608 (C) 3608 (D) 1208
In full pitched winding, the electrical degree between two coil sides of a coil is
__________.

(a) 1808 (b) 608 (c) 3608 (d) 1208

5 6682

14. KµkUS EÀø»PÒ ö\´¯ ÷uøÁ¯õÚ _¸ÒPÎß GsoUøP __________.
(A) 18 (B) 9 (C) 36 (D) 12
Number of coils required for single layer :

(a) 18 (b) 9 (c) 36 (d) 12

15. •iÄPøÍz xÀ¼¯©õP öÁΨ£kzx® EÀ»Pa ÷\õuøÚ :
(A) ÃÌa] ÷\õuøÚ
(B) E¸Ò Aøh E¸ªa ÷\õuøÚ
(C) E¯º uøh©õÛ ÷\õuøÚ
(D) ªß÷Úõmh AÍÂa ÷\õuøÚ
__________ gives the accurate result for testing the armature.
(a) Drop test
(b) Growler test
(c) Insulation resistance test
(d) Winding resistance test

£Sv & II / PART - II

SÔ¨¦ : GøÁ÷¯Ý® £zx ÂÚõUPÐUS _¸UP©õP Âøh¯ÎUPÄ®. ÂÚõ Gs
28 &US Pmhõ¯©õP Âøh¯ÎzuÀ ÷Ásk®. 10x3=30
Note : Answer any ten questions briefly. Question No. 28 is compulsory.

16. ìQß ÂøÍÄ GßÓõÀ GßÚ ?
What is Skin effect ?

17. JÎ Aø©¨¦ vmhzvß ÁøPPøͨ £mi¯¼kP.
List out the types of lighting schemes.

18. }µõ ªß÷u´¨¦¨ ö£mi°ß £µõ©›¨¦ SÔ¨¦PøÍU TÖP.

State the Maintenance tips of steam electric Iron box.

[ v¸¨¦P / Turn over

6682 6

19. uõÛ¯[Q ªß \»øÁ C¯¢vµzvß C¸ ÁøPPÒ ¯õøÁ ?
What are the two types of automatic washing machine ?

20. öuõ[S® ªßÂ]Ô°À Aø©¢xÒÍ ªß÷uUQ°ß £o ¯õx ?
What is the use of a capacitor in ceiling fan ?

21. ªß_ØÖ ¤›¨£õß – ]Ö SÔ¨¦ ÁøµP.
Write short notes on electrical isolator.

22. hõ[ öhìh›ß £¯ß ¯õx ?
What is the use of Tong tester ?

23. ÷|›¯À ©õÔ ©õÖ£mh ªß©õØÔ°ß SøÓPÒ ¯õøÁ ?
What are the disadvantages of linear variable differential transformers ?

24. ‰ßÖ •øÚ xÁUQUS® |õßS •øÚ xÁUQUS® Cøh÷¯²ÒÍ ÷ÁÖ£õk&
PøÍ TÖP.
State the differences between three point starter and four point starter.

25. yshÀ ÁøP ªß÷Úõi xÁUQ°ß ÁøPPÒ ¯õøÁ ?
What are the different types of starters used in induction motor ?

26. x¸Á Cøhzyµ® GßÓõÀ GßÚ ?
What is pole pitch ?

27. •Êa_¸Ò EÀø» GßÓõÀ GßÚ ?
What is whole coil winding ?

28. £» ªß÷Úõi C¯UQ°ß |ßø©PøÍ GÊxP.

Write the advantages of Multi motor drive.

7 6682

£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® I¢x ÂÚõUPÐUS ©mk® Âøh¯ÎUPÄ®. ÂÚõ Gs
35 &US Pmhõ¯©õP Âøh¯ÎUPÄ®. 5x5=25

Note : Answer any five questions. Question No. 35 is compulsory.

29. ªß £Qº©õÚzvß £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
Draw the diagram of power transmission and point out its parts.

30. {¯õß ÂÍUS – ÂÍUSP.
Explain about neon lamp.

31. ªß AÚÀ Áõmk°À HØ£k® SøÓ£õkPÒ, Põµn® ©ØÖ® {Áºzv ö\´uø»
AmhÁøn¨£kzxP.
Tabulate the troubles, reasons and remedial measures of an electric bread toaster.

32. Eµõ´Ä \Uv – ÂÁ›UPÄ®.
Explain about friction power.

33. ªß AÊzuzuõÀ C¯[S® {»UP]Ä ªß_ØÖ xsi¨£õß £ØÔ ÂÍUSP.
Explain the operation of voltage operated earth leakage circuit breaker.

34. ÷|ºvø\ ªßÚP EÀø»PÎÀ EÒÍ £À÷ÁÖ Cøhzyµ[PøÍ ÂÍUSP.
Explain the different types of pitches used in DC armature windings.

35. uk¨¦ £µõ©›¨¦ ©ØÖ® C¯¢vµ® ö\¯»ØÓ ¤ß¦ ö\´²® £µõ©›¨¦ £ØÔ
_¸UP©õP GÊxP.
Write a short note on preventive maintenance and Break down maintenance of a

machine.

[ v¸¨¦P / Turn over

6682 8

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

36. (A) Áøµ¯ÖUPÄ® :
(i) JκĨ£õ¯® (ii) JÎaö\ÔÄ A»S
(iii) JÎ ÂÍUPa ö\ÔÄ (iv) JÎ A»S
(v) ÷»®£ºmì öPõø\ß Âv
AÀ»x
(B) Tøµ ªß Â]Ô°ß Aø©¨¦ ©ØÖ® ö\¯À£k® Âuzøu ÂÁ›UPÄ®.
(a) Define :
(i) Luminous flux (ii) Lumen
(iii) Luminous intensity (iv) Lux
(v) Lambert’s cosine law
OR
(b) Explain the construction and working principle of Ceiling fan.

37. (A) øhµUm&Bß&ø»ß xÁUQ°ß Aø©¨¦, ÷Áø» ö\´²® Âuzøu
£hzxhß ÂÍUPÄ®.
AÀ»x
(B) £µõ©›zu¼ß ÁøPPøÍ ÂÍUQ GÊxP.
(a) Explain the construction and operation of direct-on-line starter with a neat
sketch.
OR
(b) Explain the different types of maintenance.

-oOo-