TN 12th Question Paper 2023 Basic Automobile Engineering

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 7
6685
!6685BasicAutoEng! £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 ©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.

6685 2

1. PõØÖ Gvº¨¦z uøh Põn EuÄ® `zvµ® :
(A) W tan› (B) Ka AV2 (C) KW (D) W sin›
The formula used to find Air Resistance is :
(a) W tan› (b) Ka AV2 (c) KW (d) W sin›

2. Eµõ´Ä uzxÁzvÀ C¯[S® £õP® :
(A) QÍma (B) Gßâß (C) i£µß]¯À (D) Q¯º£õUì
The part that works on the principle of friction is :
(a) Clutch (b) Engine (c) Differential (d) Gear Box

3. hõU QÍma (Dog clutch) ‰»® BØÓÀ Phzx® Q¯º£õUì ÁøP :
(A) ][U÷µõö©è Q¯º£õUì (B) ]ø»i[ ö©è Q¯º£õUì
(C) G¤ø\UÎU Q¯º£õUì (D) Põßìhßm ö©è Q¯º£õUì
The gear box which transfers the power through the dog clutch is :
(a) Synchromesh Gear Box (b) Sliding mesh Gear Box
(c) Epicyclic Gear Box (d) Constant Mesh Gear Box

4. ¦öµõ¨£À»º åõ¨m&ß ÁøPPÒ :
(A) 5 (B) 3 (C) 2 (D) 4
Types of propeller shaft :
(a) 5 (b) 3 (c) 2 (d) 4

5. £¸zv AÀ»x ø|»õß AÀ»x ÷µ¯õß ¡ÀPÍõÀ ¤ßÚ¨£mh h¯›ß £SvUS
__________ GßÖ ö£¯º
(A) ÷µi¯À ¤øÍ (B) ¤øÍ
(C) Qµõì ¤øÍ (D) ¥m
The part of the tyre which is made of cotton or nylon or rayon threaded to the tyre
is called ____________.
(a) Radial ply (b) Ply
(c) Cross ply (d) Bead

6. Bm÷hõö©õø£À ÁõPÚ[PÎÀ ö£¸®£õ¾® £¯ß£kzu¨£hõu h¯º Gx ?
(A) ¦À»m ¦¹¨ h¯º (B) öPmi¯õÚ h¯º
(C) vµÁ® {µ¨£¨£mh h¯º (D) PõØÖ {µ¨£¨£mh h¯º
Which tyre is mostly not used in Automobile vehicles ?

(a) Bullet proof tyre (b) Solid tyre
(c) Liquid filled tyre (d) Pneumatic tyre

3 6685

7. ö£¸®£õ»õÚ PõºPÎÀ __________ uøh Aø©¨¦ £¯ß£kzu¨£kQÓx.
(A) PõØÖ (B) C¯¢vµ
(C) vµÁ (D) CÁØÔÀ GxĪÀø»
In most of the cars ___________ brake system is used.
(a) Air (b) Mechanical
(c) Hydraulic (d) None of above

8. PõØÓÊzv __________ ‰»® C¯UP¨£kQÓx.
(A) Q¯º£õUì (B) Gßâß (C) ¤ß Aa_ (D) QÍma
Air compressor is driven by ___________.
(a) Gear Box (b) Engine (c) Rear axle (d) Clutch

9. RÌPõs£ÚÁØÔÀ ìjÀ 줛[ ÁøP AÀ»õux Gx ?
(A) {ø» {ÖzuU P®¤ (B) _¸Ò ÂÀ
(C) •ÖUSz usk (D) ¤ìhß ÁøP
Which of the following is not a steel spring type ?
(a) Stabilizer bar (b) Coil spring
(c) Torsion bar (d) Piston type

10. _¸Ò P®¤ 줛[ __________ \Uvø¯ öÁΰkQÓx.
(A) ÁøͲ® ÷£õx (B) SÖS® ÷£õx
(C) ›²® ÷£õx (D) {ª¸® ÷£õx
The energy is released in the coil spring during :
(a) Bending (b) Compression
(c) Expansion (d) Straightening

11. •ß Aaø\²®, ìh¨ Aaø\²® Cøn¨£x :
(A) ìi¯›[ åõ¨m (B) Põmhº ¤ß
(C) Q[ ¤ß (D) ÷£›[
Front axle and stub axle is connected by :

(a) Steering shaft (b) Cotter pin
(c) King pin (d) Bearing

6685 4

12. ÁõPÚzvß •xöP¾®¦ GÚ¨£kÁx :
(A) Aia\mh® (B) ÷©ØTk (C) QÍma (D) Gßâß
The Back bone of the vehicle is :
(a) Chassis frame (b) Body (c) Clutch (d) Engine

13. •ß£UP •mkuõ[Q (Front bumper) &°ß öÁÎ AÍÂØS® •ß Aa]ß ø©¯ÁÈ
ö\[SzxU ÷PõmiØS® Cøh¨£mh yµ® :
(A) •ß£UP KÁº ÷í[ (B) C¸_ Cøhzyµ®
(C) ¤ß£UP KÁº ÷í[ (D) ÃÀ mµõU
The distance between the front bumper and centre of front axle is called :
(a) Front over Hang (b) Wheel Base
(c) Rear over Hang (d) Wheel track

14. Gö»Um÷µõø»m vµÁzvÀ Aª»•® usp¸® G¢u ÂQuzvÀ P»¢v¸US® ?
(A) 4 : 1 (B) 1 : 3 (C) 1 : 4 (D) 3 : 1
The ratio of acid and water in an electrolyte solution is :
(a) 4:1 (b) 1:3 (c) 1:4 (d) 3:1

15. TØÖ (i) : íõm ªß ö£õÔUPmøh Av÷ÁP GßâßPÐUS ªPÄ® HØÓuõS®.
TØÖ (ii) : ö£m÷µõÀ&PõØÖ P»¢u G›P»øÁø¯ G›¨£uØS ªßö£õÔ Pmøh.
(A) TØÖ (i) uÁÖ ©ØÖ® TØÖ (ii) \›
(B) TØÖ (i) ©ØÖ® (ii) uÁÖ
(C) TØÖ (i) ©ØÖ® (ii) \›
(D) TØÖ (i) \› ©ØÖ® TØÖ (ii) uÁÖ
Statement (i) : Hot spark plug is suitable for high speed engine.
Statement (ii) : Petrol-air fuel mixture is ignited by spark plug.
(a) Statement (i) is False and statement (ii) is True.
(b) Statement (i) and (ii) are False.

(c) Statement (i) and (ii) are True.
(d) Statement (i) is true and statement (ii) is False.

5 6685

£Sv & II / PART - II
SÔ¨¦ : H÷uÝ® £zx ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 28 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 10x3=30
Note : Answer any ten questions. Question No. 28 is Compulsory.

16. E¸Ð® uøh GßÓõÀ GßÚ ?
What is Rolling Resistance ?

17. QÍma&ß £¯ßPÒ £ØÔ TÖP.
State the uses of Clutch.

18. QÍma ø»Û[ GßÓõÀ GßÚ ? QÍma ø»Û[ u¯õ›UP¨ £¯ß£k® ö£õ¸mPÒ
¯õøÁ ?
What is Clutch Lining ? What are the materials used for making Clutch Lining ?

19. £Ø\UPµ ÂQu® Gߣøu Áøµ¯ÖUPÄ®.
Define gear ratio.

20. ²ÛÁº\À áõ°smiß ÷uøÁPøÍU TÖP.
State the functions of universal joint.

21. ¤ß Aa]ß «x uõUP¨£k® Âø\PÒ ¯õøÁ ?
What are the forces acting on the rear axle ?

22. \UPµzvÀ C¸UP ÷Ási¯ ußø©PÒ ¯õøÁ ?
What are the properties of the wheel ?

23. uøh Aø©¨¤ß ÁøPPÒ £ØÔ TÖP.
State the types of Braking system.

24. AvºÄ uõ[S® Aø©¨¤ß E£÷¯õP® £ØÔ ]Ö SÔ¨¦ ÁøµP.
Write short notes on the uses of suspension system.

25. ÁøÍÄ Bµ® Gߣøu Áøµ¯ÖUPÄ®.
Define Turning Radius.

6685 6

26. ÁõPÚzvß Ai¨£øh AÍÄPÒ H÷uÝ® ‰ßÔøÚU TÔ ÂÍUSP.
State any three important dimensions of the vehicle and explain.

27. Hº Psi\Û[ GßÓõÀ GßÚ ?
What is Air-conditioning ?

28. ÷\êì ¤÷µ® u¯õ›UP¨ £¯ß£k® E÷»õP[PÒ ¯õøÁ ?
What are the materials that are widely used for the manufacture of the chassis
frame ?

£Sv & III / PART - III
SÔ¨¦ : H÷uÝ® I¢x ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 35 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 5x5=25
Note : Answer any five questions. Question No. 35 is Compulsory.

29. QÍma |ÊÄÁuØPõÚ Põµn[PøÍU TÖP.
State the reasons for clutch slip.

30. i£µß]¯ì ³Ûm £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.
Draw a neat sketch of Differential unit and name the parts.

31. h¯º Pmk©õÚ® £ØÔ ÂÁ›UPÄ®.
Explain Tyre Construction.

32. vµÁzuøh Aø©¨¤ß {øÓPÒ ¯õøÁ ?
What are the merits of Hydraulic brake ?

33. £møh ÂÀ öuõS¨¤ß ÁøPPÒ ¯õøÁ ? H÷uÝ® JßÔøÚ¨ £ØÔ ÂÁ›UPÄ®.
What are the types of Leaf spring ? Explain any one type.

34. ö©UPõÛUPÀ ìi¯›[ ©ØÖ® £Áº ìi¯›[Qß ÷ÁÖ£õkPøÍU TÖP.
State the differences between Mechanical steering and Power steering.

i[P›[ GßÓõÀ GßÚ ? i[P›[ ö\´¯ ÷uøÁ¯õÚ E£Pµn[PøÍU TÖP.

35.
What is tinkering ? State the tools used for tinkering.

7 6685

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

36. (A) •ß¦Ó Gßâß ¤ß \UPµ C¯UPzvß Aø©¨ø£²® C¯[S® Âuzøu²®
£hzxhß ÂÁ›UPÄ®.
AÀ»x
(B) ÷P® ©ØÖ® ö£U ÁøP ìi¯›[ Q¯º £õUì&ß Aø©¨ø£²® C¯[S®
Âuzøu²® £hzxhß ÂÁ›UPÄ®.
(a) Explain the construction and working of Front engine Rear wheel drive with
a neat sketch.
OR
(b) Explain the construction and working of Cam and Peg type Steering Gear
Box with a neat sketch.

37. (A) ]ø»i[ ö©è Q¯º£õUì&ß £h® Áøµ¢x Aø©¨ø£²® C¯[S®
Âuzøu²® ÂÁ›UPÄ®.
AÀ»x
(B) ÷£mh› Põ°À CUÜ\ß Aø©¨¤ß £h® Áøµ¢x Aø©¨ø£²® C¯[S®
Âuzøu²® ÂÁ›UPÄ®.
(a) Explain the construction and working of sliding mesh gear box with a sketch.
OR
(b) Explain the construction and working of battery coil ignition system with a
neat sketch.

-oOo-