TN 12th Question Paper 2024 Basic Automobile Engineering

TN PUBLIC EXAM

QUESTION
PAPER
2024

No. of Printed Pages : 7
7485
!7485BasicAutoEng! £vÄ Gs
Register Number

Part III — Vocational Subjects
(Engineering and Technology Area)
Ai¨£øh uõÛ¯[Q Fºv ö£õÔ°¯À & P¸zv¯À
BASIC AUTOMOBILE 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 |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

7485 2

1. GßâÛ¼¸¢x Á¸QßÓ \Uvø¯ Kk® \UPµzvØS ö\¾zx® Aø©¨¦ :
(A) iµõßìª\ß Aø©¨¦ (B) Q¯º Aø©¨¦
(C) uøh Aø©¨¦ (D) ìi¯›[ Aø©¨¦
Power produced from the engine is transmitted to the rotating wheels by :
(a) Transmission system (b) Gear system
(c) Braking system (d) Steering system

2. QÍma G¢u uzxÁzvÀ C¯[SQÓx ?
(A) Eµõ´Ä uzxÁ® (B) ö|®¦÷PõÀ uzxÁ®
(C) £õµ÷h Âv (D) £õìPÀ Âv
The clutch works on the principle of :
(a) Friction (b) Lever
(c) Faraday’s Law (d) Pascal’s Law

3. QÍma ¤÷Ím G¢u E÷»õPzuõÀ ö\´¯¨£mk C¸US® ?
(A) C¸®¦ (B) A¾ªÛ¯® (C) ìjÀ (D) uõªµ®
In which metal, clutch plate is made up of ?
(a) Iron (b) Aluminium (c) Steel (d) Copper

4. Q¯º £õUêÀ E¯Ä Gsön´ __________ Q÷»õ «mh¸US J¸ •øÓ ©õØÓ¨£h
÷Ásk®.
(A) 5000 (B) 1000 (C) 10000 (D) 2000
The lubricant oil in the gear box must be replaced for every __________ kilometers.
(a) 5000 (b) 1000 (c) 10000 (d) 2000

5. ÁõPÚzvß ö©õzu Gøhø¯ BUêÀ åõ¨m uõ[SÁx G¢u ÁøP ¤ß Aa_ ?
(A) PõÀ £[S ªuøÁ Aa_ (B) Aøµ £[S ªuøÁ Aa_
(C) •UPõÀ £[S ªuøÁ Aa_ (D) •Ê £[S ªuøÁ Aa_
The type of rear axle which bears the whole weight of the vehicle is called as :
(a) Quarter Floating axle (b) Semi Floating axle
(c) Three Quarter Floating axle (d) Full Floating axle

6. möµm GzuøÚ ÁøP¨£k® ?
(A) 5 (B) 2 (C) 4 (D) 3
How many types of treads are there ?
(a) 5 (b) 2 (c) 4 (d) 3

3 7485

7. uøh¨ £møhPÒ (Brake Linings) ö£õxÁõP G¢u¨ ö£õ¸ÍõÀ u¯õ›UP¨£kQÓx ?
(A) Áõº¨¦ C¸®¦ (B) Aìö£ìhõì
(C) A¾ªÛ¯U P»øÁ (D) Põ¨£º
In which material, Brake linings are generally made up of ?
(a) Cast iron (b) Asbestos
(c) Aluminium alloy (d) Copper

8. PõºPÎÀ G¢u ÁøP uøh AvP©õP £¯ß£kzu¨£kQÓx ?
(A) PõØÖ uøh (B) C¯¢vµ uøh
(C) öÁØÔh uøh (D) vµÁ uøh
What type of brake is mostly used in cars ?
(a) Air brake (b) Mechanical brake
(c) Vacuum brake (d) Hydraulic brake

9. xøn 줛[ G¢u ÁøP ÁõPÚ[PÎÀ £¯ß£kzu¨£kQÓx ?
(A) Cµsk \UPµ ÁõPÚ® (B) C»SµP ÁõPÚ®
(C) ‰ßÖ \UPµ ÁõPÚ® (D) PÚµP ÁõPÚ®
In which type of vehicle, helper springs are used ?
(a) Two wheelers (b) Light vehicles
(c) Three wheelers (d) Heavy vehicles

10. ÷Pìhº ÷Põn® GzuøÚ iQ› Áøµ Aø©UP¨£mi¸US® ?
(A) 108 •uÀ 128 Áøµ (B) 28 •uÀ 38 Áøµ
(C) 58 •uÀ 68 Áøµ (D) 78 •uÀ 88 Áøµ
The allowable caster angle in degree is :
(a) 108 to 128 (b) 28 to 38
(c) 58 to 68 (d) 78 to 88

11. •ß£UP C¸ \UPµ[PÎß ø©¯[PÐUS Cøh÷¯ EÒÍ CøhöÁÎø¯ GÆÁõÖ
AøÇUQß÷Óõ® ?
(A) uøµ©mh CøhöÁÎ (B) ÃÀ ÷£ì
(C) ö©õzu AP»® (D) ÃÀ mµõU
The distance between the centre of two front wheels is called as :
(a) Ground clearance (b) Wheel base
(c) Overall width (d) Wheel track

[ v¸¨¦P / Turn over

7485 4

12. J¸ ÷|ºªß •øÚ²® J¸ Gvºªß •øÚ²® öPõshx __________.
(A) ªßP»® (B) ÷µõmhõº (C) Põ°À (D) ö\À
A positive terminal and a negative terminal form a __________.
(a) Battery (b) Rotor (c) Coil (d) Cell

13. øhÚ÷©õÂß ©Öö£¯º GßÚ ?
(A) A.C. öáÚ÷µmhº (B) öáÚ÷µmhº
(C) Âsm ìQŸß øÁ¨£º (D) BÀhº÷Úmhº
What is the another name of Dynamo ?
(a) A.C. Generator (b) Generator
(c) Wind screen wiper (d) Alternator

14. •uÀ Q¯º ÂQu® :
(A) 3 : 1 (B) 2 : 1 (C) 1 : 2 (D) 1 : 1
First gear Ratio is :
(a) 3:1 (b) 2:1 (c) 1:2 (d) 1:1

15. TØ-Ö (i) : ÁõPÚ ÷©ØTk ©øÇ ÷£õßÓÁØÔ¼¸¢x £¯n® ö\´£ÁºPøͨ
£õxPõUQÓx.
TØÖ (ii) : ÁõPÚ ÷©ØTk y_ ÷£õßÓøÁ ÁõPÚzvÝÒ ~øǯõ©À £õx&
PõUQÓx.
(A) TØÖ (i) ©ØÖ® (ii) \›
(B) TØÖ (i) ©ØÖ® (ii) uÁÖ
(C) TØÖ (i) \›, (ii) uÁÖ
(D) TØÖ (i) uÁÖ, (ii) \›
Statement (i) : Vehicle body protects the passenger from rainfall.
Statement (ii) : Vehicle body prevents the dust from entering into the vehicle.
(a) Statement (i) and (ii) are True
(b) Statement (i) and (ii) are False
(c) Statement (i) True and (ii) False
(d) Statement (i) False and (ii) True

5 7485

£S-v & II / PART - II

SÔ¨¦ : H÷uÝ® £zx ÂÚõU- P - Ð US Âøh- ¯ - Î U- P - Ä ®. ÂÚõ Gs 28 &US
Pm-hõ-¯-©õP Âøh-¯-ÎU-P-Ä®. 10x3=30
Note : Answer any ten questions. Question No. 28 is Compulsory.

16. \õ´Äz uøh GßÓõÀ GßÚ ?
What is meant by Gradient resistance ?

17. QÍma]ß ÁøPPÒ H÷uÝ® ‰ßÔøÚ GÊxP.
Write any three types of Clutch.

18. Q¯º £õU]ß Aø©Âh® Gx ?
Where is the gearbox located ?

19. ¤ß Aa]ß ÁøPPøÍ GÊxP.
Write the classification of the Rear axles.

20. h¯›ß ÷Áø» GßÚ ?
What is the work of Tyre ?

21. umk ÁøPz uøh°À EÒÍ |ßø©PÒ ¯õøÁ ?
What are the advantages of disc type brakes ?

22. £møh ÂÀ öuõS¨¤ß ÁøPPÒ ¯õøÁ ?
Classify the types of leaf spring.

23. ÃÀ Bku¾UPõÚ Põµn[PÒ ¯õøÁ ?
What are the reasons for wheel wobble ?

24. C¸_ Cøhz yµ® – Áøµ¯ÖUPÄ®.
Define wheel base.

25. Gö»UmµõÛU CUÜ\ß Aø©¨¤ß |ßø©PøÍU TÖP.
List out the advantages of an electronic ignition system.

26. ìi¯›[ Aø©¨¤ß £õP[PøÍ GÊxP.
Write the parts of steering system.

[ v¸¨¦P / Turn over

7485 6

27. QÍma]À \zu® HØ£hU Põµn[PÒ ¯õøÁ ?
What are the reasons for clutch noise ?

28. ÷»õk ÷µmi[ GßÓõÀ GßÚ ?
What is meant by Load rating ?

£S-v & III / PART - III

SÔ¨¦ : H÷uÝ® I¢x ÂÚõU- P - Ð US Âøh- ¯ - Î U- P - Ä ®. ÂÚõ Gs 35 &US
Pm-hõ-¯-©õP Âøh-¯-ÎU-P-Ä®. 5x5=25
Note : Answer any five questions. Question No. 35 is Compulsory.

29. \Uv Phzx® Aø©¨¤ß ÁøPPÎÀ JßÔøÚ £hzxhß ÂÁ›UPÄ®.
Explain any one type of transmission system with sketch.

30. L¦Ñ°m ¤øÍÃ¼ß |ßø©, wø©Pøͨ £mi¯¼kP.
List out the merits and demerits of fluid flywheel.

31. H÷uÝ® J¸ ÁøP ²ÛÁº\À áõ°siß £h® Áøµ¢x Auß Aø©¨ø£²®,
C¯UPzøu²® ÂÁ›UPÄ®.
Explain the construction and working of any one type of universal joint with a suitable
sketch.

32. \UPµ[PøÍ \©{ø»¨£kzxuÀ GßÓõÀ GßÚ ? AuøÚ ÂÁ›UPÄ®.
What is Wheel Balancing ? Explain it.

33. Põ°À 줛[Qß |ßø©, wø©Pøͨ £mi¯¼kP.
List out the advantages and disadvantages of a coil spring.

34. Põ°À CUÜ\ß Aø©¨¤ØS® ÷©UÚm÷hõ CUÜ\ß Aø©¨¤ØS® EÒÍ
÷ÁÖ£õkPøÍU TÖP.
State the differences between coil ignition system and magneto ignition system.

35. ÷hsh® ÁøP ¤µuõÚ ]¼shº £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
Draw and name the parts of Tandem master cylinder.

7 7485

£S-v & IV / PART - IV

SÔ¨¦ : AøÚz-x ÂÚõU-P-ÐU-S® Âøh-¯-ÎU-P-Ä®. ÷uøÁ¯õÚ Ch[PÎÀ £h®
ÁøµP. 2x10=20
Note : Answer all the questions. Draw diagram wherever necessary.

36. (A) ö\ßm›¤³PÀ QÍma £h® Áøµ¢x ÂÁ›UPÄ®.
AÀ-»-x
(B) ÁõPÚzvÀ £¯ß£kzu¨£k® •UQ¯ ÂÍUSPÎß ö£¯ºPøͲ® AÁØÔß
£¯ßPøͲ® ÂÍUSP.
(a) Draw and explain about centrifugal clutch.
OR
(b) Explain the various lights used in the automobile and its purposes.

37. (A) ÷µU ©ØÖ® ¤Û¯ß ÁøP ìi¯›[ Q¯º£õUì&ß Aø©¨ø£²®, C¯[S®
Âuzøu²® £hzxhß ÂÁ›UPÄ®.
AÀ-»-x
(B) ÁõPÚzvß •UQ¯©õÚ AÍÄPÒ £ØÔ ÂÁ›UPÄ®.
(a) Explain the construction and working principle of rack and pinion steering gearbox
with a neat sketch.
OR
(b) Explain about important dimensions of the vehicle.

-oOo-

[ v¸¨¦P / Turn over

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