TN 11th Question Paper 2025 Basic Electrical Engineering

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8477
!8477IstYearBasicElectricalEngineering! £vÄ Gs
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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¨£mh |õßS ©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

8477 2

1. E¯º-Á-Êzu ªß-\õ-µ® Gß-ÓõÀ GßÚ ?
(A) 11 Q.÷Áõ.US ÷©À (B) 230 ÷Áõ
(C) 11 Q.÷Áõ.US RÌ (D) 440 ÷Áõ
HT Line means :
(a) Above 11 kV (b) 230 V
(c) Below 11 kV (d) 440 V

2. J¸ T¾® Gß-£-uß ©v¨¦ ¯õx ?
(A) 2π×10 8 (B) 2π×1018
(C) 2π×10−8 (D) 2π×10−18
What is the value of one coulomb ?
(a) 2π×10 8 (b) 2π×10 18
(c) 2π×10 −8 (d) 2π×10 −18

3. {»U-P-]Ä xs-i¨-£õ-ß ªß-_Ø-øÓ __________ ö|õ-i-°À xs-iU-Q-Óx.
(A) 0.2 ö|õ-i (B) 0.1 ö|õ-i
(C) 0.02 ö|õ-i (D) 0.01 ö|õ-i
The earth leakage circuit breaker breaks the circuit in __________ seconds.
(a) 0.2 sec (b) 0.1 sec
(c) 0.02 sec (d) 0.01 sec

4. Pm-k¨-£õmk ›÷»-°ß £¯ß-£õk GßÚ ?
(A) Bß/B-L¨ ö\´¯
(B) {ø»-¯õÚ ªß-Ú-Êz-uzøu £µõ-©-›UP
(C) Â{-÷¯õ-Pzøu Pm-k¨-£-kz-u
(D) ªß-Ú-Êzu ÃÌa-]-ø¯z uºU-P
What is the use of control relay ?
(a) To turn ON/OFF
(b) To maintain static voltage
(c) To control the supply
(d) To avoid voltage drops

3 8477

5. L¤Í®-ª[-Qß ChUøP Âv __________ US ö£õ-¸¢-x®.
(A) Aø» v¸z-v (B) ªß-÷Úõ-i
(C) Po-Û (D) ªß-Û-¯U-Q
Fleming's left hand rule is applicable for __________.

(a) Inverter (b) Motor

(c) Computer (d) Generator

6. ¼z-v-¯® A¯-Û ªß-P-»z-vß ªß-Ú-Êzu ©v¨¦ ¯õx ?
(A) 3.6 •uÀ 5 ÷ÁõÀm Áøµ (B) 2 •uÀ 2.5 ÷ÁõÀm Áøµ
(C) 5 ÷ÁõÀmUS ÷©À (D) 2.5 •uÀ 3.6 ÷ÁõÀm Áøµ
The voltage range of lithium-ion battery is __________.

(a) 3.6 to 5 Volt (b) 2 to 2.5 Volt

(c) Above 5 Volt (d) 2.5 to 3.6 Volt

7. Ái-ÄU Põ-µ-o-°ß ©v¨¦ ¯õx ?
2 π
(A) 1.414 (B) π (C) 1.11 (D) 2

The value of form factor is :

2 π
(a) 1.414 (b) (c) 1.11 (d)
π 2

8. J¸ øh÷¯õk uø»RÌ \õº-¦-øh-¯-uõP C¸U-S®-÷£õx, Au-ß ö\¯À-£õm-iß ö£¯º
__________ .

(A) \õº-¦ (B) ªß-P-hz-v
(C) SøÓ Phz-v (D) ªß Phz-uõ¨ ö£õ-¸Ò
When a diode is reverse-biased, it acts as :

(a) biasing (b) conductor

(c) semi-conductor (d) insulator

[ v¸¨¦P / Turn over

8477 4

9. ªß-©õØÔ __________ ÷Áø» ö\´-²®.
(A) AC ©Ø-Ö® DC&À (B) DC&À ©m-k®
(C) UPS&À (D) AC&À ©m-k®
The transformer will work on :

(a) AC and DC (b) DC only

(c) UPS (d) AC only

10. ªß-÷u´¨-¤-°À AÔ-S-Ô ÂÍUS Gß-£x __________ BS®.
(A) Jκ •øÚ ÂÍU-S (B) öÁs-_-hº ÂÍU-S
(C) øP¯-hUP ªÎ-¸® ÂÍU-S (D) SÇÀ ÂÍU-S
__________ is used as an indicating lamp in the iron box.

(a) Light emitting diode lamp (b) Incandescent lamp

(c) Compact fluorescent lamp (d) Tube light

11. PÀ-|õº Amøh Gß-£-x __________.
(A) ªß-P-hz-x® ö£õ-¸Ò (B) ªß-P-hz-uõ¨- ö£õ-¸Ò
(C) GÎ-vÀ w¨-£Ø-ÓU Ti-¯-x (D) öÁ¨-£zøu uõ[-Põ-x
Mica sheet is a :

(a) conductive material (b) non-conductive material

(c) easily combustible (d) non-resistive to heat

12. Â]-Ô _Ç-¾® Ám-hz-vß Âmh AÍÄ __________.
(A) Â]Ô Ãa-_ (B) Â]Ô Cøn¨-¦
(C) Â]Ô AÍÄ (D) Â]-Ô-°ß }Í®
Rotating diameter of the fan is called :

(a) Fan sweep (b) Fan connection

(c) Fan size (d) Length of the Fan

5 8477

13. us-p-›À C¸U-S® ö£›-¯ ©øÓ¢-xÒÍ xPÒ-PÒ __________ AkU-QÀ Ái-Pm-h¨
£k-Q-Ó-x.
(A) AÀm-µõ-L-¤À-i-÷µ-åß (B) ¦Ó Fuõ
(C) ö\¯À-£-kz-u¨-£mh Põº-£ß (D) uø»-RÌ \Æ-Åk £µ-ÁÀ
Large suspended particles present in water is filtered in __________ layer.
(a) ultra filtration (b) ultra-violet
(c) activated carbon (d) reverse osmosis

14. Põ´-P-Ô-PÒ ©Ø-Ö® £Ç[-P-Îß TÌ u¯õ-›UP __________ £¯ß-£-k-Q-Óx.
(A) Ps-nõ-i áõ-i (B) E»º áõ-i
(C) Dµ-©õ-Ú áõ-i (D) \m-Û áõ-i
For pulping of vegetables and fruits __________ is used.
(a) glass jar (b) dry jar
(c) wet jar (d) chutney jar

15. G¢u Bsk •uÀ Põ-µõ-Úx, ªß-\õµ ÷©õm-hõº ‰»® C¯U-P¨-£m-hx ?
(A) 1962 (B) 1911 (C) 1899 (D) 1827
In which year was the first car powered by an electric motor ?
(a) 1962 (b) 1911 (c) 1899 (d) 1827

£Sv & II / PART - II
SÔ¨¦ : GøÁ÷¯Ý® £z-x ÂÚõUPÐUS _¸U-P-©õP Âøh¯ÎUPÄ®. AÁØ-ÔÀ
ÂÚõ Gs 28 &US Pmhõ¯® Âøh¯ÎzuÀ ÷Ásk®. 10x3=30
Note : Answer any ten questions briefly. Question No. 28 is Compulsory.

16. Cµsk ªß- u - ø h- P Ò 3Ω ©Ø- Ö ® 6Ω BQ- ¯ øÁ Cøn- ¯ õP CønU- P ¨- £ mk
240 ÷Áõ. ªß- Ú Êz- u z- v À CønU- P ¨- £ m- k ÒÍÚ G- Û À ö©õzu ªß- u - ø h- ° ß
©v¨-ø£U PõsP.
Two resistances 3Ω and 6Ω are connected in parallel, voltage of the circuit in 240 V. Find the
value of total resistance.

[ v¸¨¦P / Turn over

8477 6

17. ªß Phz-uõ¨ ö£õ-¸Ò £ØÔ ]Ö SÔ¨¦ u¸P.
Write a short note on insulator.

18. w AønU-S® P¸-Â-P-Îß ÁøP-PÒ ¯õøÁ ?
What are the types of fire extinguisher ?

19. ÷©Uì-öÁÀ-¼ß uU-øPz v¸-S Âv-ø¯U TÖ-P.
State Maxwell’s cork screw rule.

20. L¤Í-ª[-Qß ChUøP Âv-ø¯U TÖ-P.
State Fleming's left hand rule.

21. ¤µ-u-© ªß-P-»z-vß £¯ß-PøÍU TÖP.
State the uses of a primary cell.

22. J¸[-Q-øn¢u ªß-_ØÖ (IC) Gß-ÓõÀ GßÚ ?
What is meant by Integrated Circuit ?

23. ªß-©õØ-Ô Hß KVA AÍ-ÂÀ SÔ¨-¤-h¨-£-k-Q-Óx ?
Why transformer is rating in KVA ?

24. ÷©ø\ ªß Â]-Ô-°ß ÷ÁP® GÆ-ÁõÖ ©õØ-Ó¨-£-k-Q-Óx ?
How the speed of the table fan can be changed ?

25. Aµ-øÁ C¯¢-v-µ® GßÓõÀ GßÚ ?
What is called a grinder ?

26. ªß-\õµ Áõ-PÚ[-P-Îß ÁøP-P-øÍ £mi-¯-¼-k-P.
List out the types of electric vehicles.

27. ¼z-v-¯®&-A-¯Û ªß-P-»® £ØÔ GÊ-xP.
State about lithium-ion battery.

7 8477

28. ªß-÷u´¨-¦¨ ö£m-i-°ß öÁ¨£ {ø»¨¤ £ØÔ SÔ¨¦ u¸P.
Write notes on thermostat of electric iron box.

£Sv & III / PART - III
SÔ¨¦ : GøÁ÷¯Ý® I¢-x ÂÚõUPÐUS ©m-k® Âøh¯ÎUPÄ®. AÁØ-ÔÀ ÂÚõ
Gs 35 &US Pmhõ¯©õP Âøh¯ÎUPÄ®. 5x5=25

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

29. Cøn ªß-_Ø-ÖU-PõÚ •U-Q¯ Âv-PÒ ¯õøÁ ?
What are the important rules for parallel circuit ?

30. Põ¢-u¨ ö£õ-¸m-PÒ £ØÔ ÂÁ›.
Explain magnetic materials.

31. ìhõº Cøn¨¦ •øÓ-°ß |ß-ø©-PÒ ¯õøÁ ?
What are the advantages of star connection system ?

32. ªß-©õØÔ ÷|ºz-vø\ ªß-\¨-øÍ-°À ÷Áø» ö\´-¯õx. Hß ?
Explain why transformer does not work on DC supply.

33. ø©U-÷µõ-÷ÁÆ Ak¨-¤ß £õ-P[-P-ÎÀ H÷u-Ý® ‰ß-Ô-øÚ¨ £ØÔ GÊ-xP.
Write about any three components of microwave oven.

34. Dµ A-µøÁ C¯¢-v-µz-vß £õ-P[-Pøͨ £ØÔ ÂÁ›.
Write about the components of wet grinder.

35. ªß-P-»z-vß £õ-x-Põ¨¦ SÔ¨-¦-P-ÎÀ H÷u-Ý® I¢-vøÚ GÊ-xP.
Write notes on any five points of proper battery care.

[ v¸¨¦P / Turn over

8477 8

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

36. (A) ªß-\õµ Avºa-]US AÎU-P¨-£-k® £À-÷ÁÖ ÁøP-¯õÚ •u-¾-u-Â-PøÍ ÂÁ›.
AÀ»x
(B) Põ- Ÿ ¯ Aª» ªß- P - » z- v ß Aø©¨¦ ©Ø- Ö ® ö\¯À- £ - k ® Âuz- v øÚ
£hz-x-hß ÂÁ-›.
(a) Explain the types of first aid given to electric shock.
OR
(b) Explain the construction and working principle of lead acid battery.

37. (A) ªß yshÀ Ak¨-¤ß Aø©¨¦ ©Ø-Ö® ö\¯À-£-k® Âu® £ØÔ £hz-x-hß
ÂÍU-SP.
AÀ»x
(B) Tøµ ªß- Â-]-Ô-°À RÌU-Ps-h-ÁØ-øÓ¨ £Ø-ÔU SÔ¨¦ u¸P.
(i) -uõ[-Q-PÒ
(ii) -öuõ[-S® SÇõ´ (P®¤)
(iii) -÷Á-PU-Pm-k¨-£õmk Cøn¨¤
(a) Explain the construction and working principle of an electric induction stove with
suitable sketch.
OR
(b) Write short notes for the following in a Ceiling Fan.
(i) Bearings
(ii) Down rod
(iii) Regulator

-o0o-

Study Materials
Notes

Model Papers Class 6 Notes

Sample Papers Class 7 Notes
Half Yearly Sample Papers Class 8 Notes

Class 9 Notes
Important Resources
Class 10 Notes
Periodic Table
Class 11 Notes
Writing Skills / Formats

Maps of India / World Class 12 Notes

Books and Solutions

NCERT Books
NCERT Book Solutions
HC Verma Chapter Wise Solutions
RD Sharma Solutions
CGBSE Solutions