TN 12th Question Paper 2026 Basic Electrical Engineering

FOR TN 12TH EXAM PREPARATION

TN 12th 2026
Question Paper · Basic
Electrical Engineering
EXAM YEAR TYPE SUBJECT

TN 12th 2026 Question Paper Basic Electrical Engineering

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 7
9082
!9082BasicElectEnginee! £vÄ Gs
Register Number

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BASIC ELECTRICAL ENGINEERING - THEORY
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( / Tamil & English Version )

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

Time Allowed : 3.00 Hours ] [ Maximum Marks : 90

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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.

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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.

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9082 2

1. C¢v¯õÂÀ ÁÇ[P¨£k® ªß\õµzvß Aø»Ä ÷ÁP® GÆÁÍÄ ?
(A) öíºmì (B) öíºmì (C)
50 öíºmì (D)
60 öíºmì 45 70

The frequency supply in India is __________.

(a) 50 Hz (b) 60 Hz (c) 45 Hz (d) 70 Hz

2. J¸ ªßPõ¨¦ Ámh umhõÚx __________ Áøµ uõ[PU Ti¯x .

(A) Q.÷Áõ
33 (B) Q.÷Áõ 11 (C) Q.÷Áõ
66 (D) 22 Q.÷Áõ
Voltage capacity of one disc in Suspension Type Insulator is __________.

(a) 33 kV (b) 11 kV (c) 66 kV (d) 22 kV

3. GLS Gߣx Euõµn®
__________ .

(A) C¸®£À»õ E÷»õPzvØS
(B) E÷»õP©À»õ ¤Ó ö£õ¸ÐUS
(C) P»¨¦ E÷»õPzvØS
(D) C¸®¦ P»¢u E÷»õPzvØS
Steel is an example for __________.

(a) Non-ferrous metal

(b) Non-metal

(c) Alloy metal

(d) Ferrous metal

4. ÷|ºvø\ C¯¢vµzvß EhÀ £õP® Gߣx BÀ BÚx __________ .

(A) ö\®¦ (B) Áõº¨¤¸®¦
(C) P»¨¦ E÷»õP® (D) A¾ªÛ¯®
The yoke of a DC machine is made up of __________.

(a) Copper (b) Cast-Iron

(c) Alloy metal (d) Aluminium

5. RÌUPshÁØÖÒ {ø»¯õÚ ÷ÁP® öPõsh ªß÷Úõi Gx ?
(A) ©õÖvø\ öuõhº ªß÷Úõi (B) ÷|ºvø\ Cøn ªß÷Úõi
(C) ªß©õØÔ (D) ÷|ºvø\ öuõhº ªß÷Úõi
Which of the following motor is constant speed motor ?

(a) AC series motor (b) DC shunt motor

(c) Transformer (d) DC series motor

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 2 of 8

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6. ÷|ºvø\ ªßÚõUQ Ai¨£øh uzxÁzvߣi ö\¯À£kQÓx
__________ .

(A) Qº\õ¨ Âv
(B) £õµ÷h°ß ªßPõ¢u yshÀ Âv
(C) ¤Íª[Qß ChUøP Âv
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(D) Kªß Âv
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The principle of a DC generator is based on __________.

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(a)

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Kirchhoff’s law
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Faraday’s electromagnetic Induction law

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(c)

(d)
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Fleming’s Left Hand rule

Ohm’s law

7. SøÓÁõÚ (AÀ»x) |kzuµ ÷ÁP® Eøh¯ ©õÖvø\ ªßÚõUQPÎß _Ǽ°ß
ÁøP __________.

(A) AoÀ Tk ÁøP (B) ÷\¼¯ßm x¸Á ÁøP
(C) ÁÄsm ÷µõmhõº ÁøP (D) E¸øÍ ÁiÁ ÁøP
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Which type of rotor is used in Low and Medium speed alternators ?

(a)

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Squirrel cage type rotor (b) Salient-pole type rotor

(c) Wound rotor type

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G¢u ÁøP ªß÷Úõi ©õÖvø\ ªß\õµzv¾® ÷|ºzvø\ ªß\õµzv¾®
C¯[S® ?
(A) ²ÛÁº\À ªß÷Úõi (B) ¤›¢u {ø» ªß÷Úõi
(C) ªß÷uUQ xÁUP ªß÷Úõi (D) ÷åhm x¸Á ªß÷Úõi
Which motor is used in both AC and DC supply ?

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(a) Universal motor (b) Split phase motor

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(c) Capacitor start motor (d) Shaded pole motor

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l a Cøn¨¤À CønUP ÷Ásk® ?
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(C) öuõhº ©ØÖ® Cøn (D) Cøn
In Four point starter, how the No Volt Release coil should be connected with field coil ?

(a) directly (b) in series

(c) in series and parallel (d) in shunt

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9082 4

10. 5Svøµ vÓß EÒÍ ÷©õmhõºPÐUS GÆÁøP xÁUQ HØÓx ?
(HP)

(A) ö©ßø©¯õÚ xÁUQ (B) øhµUm Bß ø»ß xÁUQ
(C) _Ǽ ªßuøh xÁUQ (D) ìhõº öhÀhõ xÁUQ
Which type of starter is applicable to a rating of 5 HP ?

(a) Soft starter (b) Direct-on-line starter

(c) Rotor resistance starter (d) Star-Delta starter

11. DCC¯UQ°ß ÷ÁP® I¨ ö£õÖzux __________ .

(A) AvºöÁs (B) ªß÷Úõmh® (C) ªßvÓß (D) ªßÚÊzu®
The speed of the DC drive depends on __________.

(a) Frequency (b) Current (c) Power (d) Voltage

12. ªß_ØÖ Pmk¨£õmk £»øP°À, ÷Pß __________ BÀ BÚx .

(A) PõÀÁøÚì ö\´¯¨£mh GLS
(B) GLS
(C) A¾ªÛ¯®
(D) ö\®¦
In parallel board, the can is made of __________.

(a) Galvanised steel

(b) Steel

(c) Aluminium

(d) Copper

13. ªß Phzuõ ö£õ¸ÐUS Euõµn® __________.
(A) A¾ªÛ¯® (B) ø©UPõ (C) xzu|õP® (D) ö\®¦
__________ is an example for Electric Insulating material.

(a) Aluminium (b) Mica (c) Zinc (d) Copper

14. Phzv°ß Âmhzøu AÍUP £¯ß£k® P¸Â :

(A) h¯À ÷Pä (B) PuÄz umk
(C) v¸S AÍ (D) L¥»º ÷Pä
The instrument used to measure the diameter of a Conductor is :

(a) Dial gauge (b) Wire gauge plate

(c) Screw gauge (d) Feeler gauge

15. {» Cøn¨¤À Cµsk ªßÁõ´PÐUPõÚ CøhöÁÎ __________.

(A) •uÀ «
5 (B) •uÀ «
7 (C) •uÀ « 3 6 2 5 (D) 2 •uÀ « 3

The distance between two earth electrodes in earthing is __________.

(a) 5 m to 7 m (b) 3 m to 6 m (c) 2 m to 5 m (d) 2 m to 3 m

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 4 of 8

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£Sv & II / PART - II

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

Note : Answer any ten questions. Question No. 28 is Compulsory.

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List out the types of electrical poles.

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17.

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•ußø© ªß£Qº©õÚ® GßÓõÀ GßÚ ? ag
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What is primary transmission ?

18. ö£õÔ°¯À ö£õ¸mPøÍ SÔ¨¤mh ÷uøÁUS ÷uº¢öukUS® •ß PÁÚzvÀ
öPõÒÍ ÷Ási¯ A®\[PÒ ¯õøÁ ?
What are the factors to be considered for the selection of materials for engineering

applications ?

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19. ÷|ºvø\ ªßÚõUQ°ß ÁøPPÒ ¯õøÁ ?

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What are the types of DC generator ?

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÷|ºvø\ öuõhº ªß÷Úõi°ß £¯ßPÒ
What are the applications of DC series motor ?

21. ªßÚP £ÒÍ[PÎß ÁøPPÒ ¯õøÁ ?
What are the types of armature slots ?

22. ªßÚÀ uõ[Q°ß £¯ß£õkPøÍ GÊxP.
Write down the application of Lightning arrester.
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23.

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xÁUQ°ß |ßø©PÒ ¯õøÁ ?
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s e What are the advantages of soft starter ?

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What is meant by variable frequency drive ?

25. ªß_ØÖ Pmk¨£õmk £»øP°ß ÁøPPøÍ £mi¯¼kP.
List out the types of panel board.

[ v¸¨¦P / Turn over

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9082 6

26. •Êa _¸Ò EÀø» GßÓõÀ GßÚ ?
What is whole coil winding ?

27. ©i¨¦ ÁøP EÀø» GßÓõÀ GßÚ ?
What is lap winding ?

28. ÷|ºvø\ ªß÷Úõi xÁUQ°À EÒÍ Cµsk £õxPõ¨¦ E£Pµn[PøÍ TÖP.
State the two protective devices of DC motor starter.

£Sv & III / PART - III

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

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

29. öuõ[PÀ ÁøP ªßPõ¨£õÛß £h® ÁøµP.
Draw the diagram of Suspension Type Insulator.

30. uß yshÀ ªßÚõUQ°ß ÁøPPÒ ¯õøÁ ?
What are the types of self-excited DC generator ?

31. AoÀ Tk _Ǽ°ß Aø©¨ø£ ÂÍUSP.
Explain the construction of squirrel cage rotor.

32. |õßS •øÚ xÁUQ°ß Áøµ£hzøu Áøµ¢x Auß £õP[PøÍ SÔUPÄ®.
Draw the circuit diagram of four point starter and label the parts.

33. ÷|ºvø\, ©õÖvø\ ªßÛ¯UQø¯ J¨¤kP.
Compare DC and AC electric drives.

34. PuÄ uPmiß £h® Áøµ¢x Au߉»® EÀø» PhzvPÎß PuÄ Gs Põq®
•øÓø¯ ÂÍUSP.
Draw the diagram of a standard wire gauge plate and explain how to find the thickness of a

conductor.

35. {» Cøn¨¤ß •UQ¯zxÁ® ©ØÖ® ÁøPPøÍ ÂÍUSP.
Explain the importance and types of earthing.

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 6 of 8

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£Sv & IV / PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. ÷uøÁ¯õÚ Ch[PÎÀ £h®
Áøµ¯Ä®. 2x10=20

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Note : Answer all the questions. Draw diagrams wherever necessary.

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36.

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(A) ö£õÔ°¯À ö£õ¸mPÎß ÁøPPøÍ ÂÁ›UPÄ®.
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(B) ²ÛÁº\À ªß÷Úõi £h® Áøµ¢x ÂÁ›UPÄ®.
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(a)
a
Describe the classification of Engineering materials.

OR

(b) Describe with neat sketch about universal motor.

37. (A) ìhõº&öhÀhõ xÁUQ°ß Aø©¨¦ ©ØÖ® ö\¯À£k® Âuzøu £hzxhß
ÂÍUSP.
AÀ»x
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(B) ÷|ºvø\ C¯UQ°ß ö\¯À£õmiøÚ ö£õ¸zu©õÚ Áøµ£hzxhß ÂÍUSP.
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(a)
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With a neat diagram, explain the construction and working principle of Star-Delta

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starter.

(b) ag OR

Explain the working principle of DC drive with suitable diagram.

- o 0 o -

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