TN 12th Question Paper 2025 Basic Automobile Engineering

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8380
!8380BasicAutoEng! £vÄ Gs
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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

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1. ©ø»¨-£-S-v-°À iµõU-\ß ©Ø-Ö® \õø» Q›¨ Av-P® QøhU-S® Gß-âß C¯UP
ÁøP :
(A) |õßS \U-Pµ C¯U-P®
(B) AvP ÷ÁP C¯U-P®
(C) ¤ß-¦Ó Gß-âß ¤ß \U-Pµ C¯U-P®
(D) ªu ÷ÁP C¯U-P®
Which engine drive provides high mountain traction and road grip ?
(a) Four wheel drive
(b) High speed drive
(c) Rear engine rear wheel drive
(d) Medium speed drive

2. iµõßì-ª-\-ÛÀ QÍma G¢u Chz-vÀ EÒÍx ?
(A) |õß-Põ-ª-h® (B) Cµs-hõ®- Ch®
(C) BÓõ® Ch® (D) •u-¼-h®
In transmission system, the clutch is placed in :
(a) Fourth place (b) Second place
(c) Sixth place (d) First place

3. Ea-\-£m\ Q¯º ÷µæ-÷¯õ :
(A) 1 : 2 (B) 2 : 1 (C) 1.5 : 1 (D) 1 : 1
Top gear ratio is :
(a) 1:2 (b) 2:1 (c) 1.5 : 1 (d) 1:1

4. Áõ-P-Úz-vß Cu-¯® Gß-£x :
(A) ¤ì-hß (B) Gß-âß (C) Q¯º £õUì (D) QÍma
Heart of the vehicle is :
(a) Piston (b) Engine (c) Gear box (d) Clutch

5. Q¯º- £õU-êÀ £¯ß-£-kz-u¨-£-k® E¯-Ä Gs-ön´ :
(A) SAE 60 (B) SAE 120 (C) SAE 50 (D) SAE 90
The lubricating oil used in the gear box is :
(a) SAE 60 (b) SAE 120 (c) SAE 50 (d) SAE 90

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6. Põßì-hßm- ö©è Q¯º -£õU-êÀ £¯ß-£-kz-u¨-£-k® £Ø-\U-Pµ ÁøP :
(A) ö|ÎÄ £Ø-\U-P-µ® (B) ÷|º £Ø-\U-P-µ®
(C) EÒ-£UP £Ø-\U-P-µ® (D) \›-Ä £Ø-\U-P-µ®
The gear used in the constant mesh Gear box is :
(a) Helical gear (b) Spur gear
(c) Internal gear (d) Bevel gear

7. ¦öµõ¨-£À-»º åõ¨-iß •ß •øÚ ö£õ-¸z-u¨-£mh £õ-P® :
(A) Q¯º £õUì (B) Gß-âß
(C) i£-µß-]-¯À ³Ûm (D) QÍma
The front end of the propeller shaft is connected with :
(a) Gear box (b) Engine
(c) Differential unit (d) Clutch

8. ¤ß-Á-¸-Á-Ú-ÁØ-ÖÒ Gx h¯-›ß vhz uß-ø©-ø¯U SÔU-Q-Óx ?
(A) mi-öµm (B) Põº-Põì (C) ¤øÍ (D) ¥m
Which one of the following indicates the solidity of the tyre ?
(a) Tread (b) Carcass (c) Ply (d) Bead

9. ›®-ø©-²® A¨-ø£-²® Cøn¨-£-x :
(A) h¯º (B) ÃÀ (C) i³¨ (D) ì÷£õUì
The rim and hub are connected by :
(a) tyre (b) wheel (c) tube (d) spokes

10. uøh¨-£m-øh-PÒ Guß «x ö£õ-¸z-u¨-£-k-Q-Óx ?
(A) \U-Pµ ]¼s-hº (B) uøhU Pm-øh
(C) ¤µ-uõÚ ]¼s-hº (D) uøh E¸-øÍ
Brake linings are affixed to which part ?
(a) Wheel cylinder (b) Brake shoes
(c) Master cylinder (d) Brake drum

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11. vµ-Á AvºÄ EÔg-]-¯õ-Úx G¢u uz-x-Áz-vß Ai¨-£-øh-°À C¯[-S-Q-Óx ?
(A) Eµõ´Ä uz-x-Á® (B) {³m-hß Âv
(C) £õì-PÀ Âv (D) ö|®¦ ÷PõÀ uz-x-Á®
Hydraulic damper is working based on the principle of __________.
(a) Principle of friction (b) Newton law
(c) Pascal’s law (d) Principle of lever

12. 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 Wheeler (b) Light Vehicles
(c) Three Wheeler (d) Heavy Vehicles

13. Áõ-P-Úz-vß C¯UP {ø»-°ß vø\-ø¯U Pm-k¨-£-kz-x® Aø©¨-¦ :
(A) Gß-âß (B) ìi-¯-›[ Aø©¨-¦
(C) AvºÄ EÔg-_® Aø©¨-¦ (D) ¤÷µU Aø©¨-¦
During driving, the direction of the vehicle is controlled by :
(a) Engine (b) Steering system
(c) Suspension system (d) Brake system

14. Áõ-P-Úz-vß •x-öP-¾®¦ Gß-£x :
(A) Gß-âß (B) Aia-\m-h® (C) i£-µß-]-¯À (D) ÷©Ø-T-k
The backbone of the vehicle is :
(a) Engine (b) Chassis frame (c) Differential (d) Body

15. CÀ-¾-ª-÷Ú-\ß Gß-£-uß ö£õ-¸Ò :
(A) C¯U-P® (B) öÁÎa-\® (C) öÁ¨-£® (D) J¼
The Illumination is related to :
(a) Motion (b) Light (c) Temperature (d) Sound

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£Sv & II / PART - II
SÔ¨¦ : GøÁ÷¯Ý® £z- x Â- Ú õU- P - Ð US Âøh¯- Î U- P - Ä ®. ÂÚõ Gs 28 &US
Pm-hõ-¯-©õP Âøh-¯-ÎUP-Ä®. 10x3=30
Note : Answer any ten questions. Question No. 28 is compulsory.

16. iµõßì-ª\ß ]ì-hz-vÀ EÒÍ •U-Q¯ £õ-P[-PøÍ GÊ-xP.
Write the important parts of the transmission system.

17. QÍma ø»Û[ u¯õ-›U-P¨ £¯ß-£-k® ö£õ-¸m-PÒ ¯õøÁ ?
What are the materials used to make the clutch lining ?

18. Q¯º- £õU-êÀ £¯ß-£-kz-u¨-£-k® £Ø-\U-P-µ[-P-Îß ÁøP-P-øÍU TÖP.
List out the types of gears used in the gear box.

19. ¦öµõ¨-£À»º åõ¨-iß ÁøP-PøÍU TÖ-P.
State the types of propeller shaft.

20. Áøµ-¯Ö : |õßS \U-Pµ C¯U-P®
Define Four wheel drive.

21. uøh vµ-Áz-vÀ P»¢-xÒÍ Tm-k¨ ö£õ-¸m-PÒ ¯õøÁ ?
What are the additives mixed in brake fluid ?

22. ]Ö SÔ¨¦ ÁøµP : \U-Pµ AÍ-Ãk
Write short notes on wheel dimension.

23. ìi-¯-›[ ÂQ-u® Gß-ÓõÀ GßÚ ?
What is meant by steering ratio ?

24. Aiz-uÍ® Gß-ÓõÀ GßÚ ?
What is meant by Chassis ?

25. ªß-ö£õ-ÔU-Pm-øh-°ß E£-÷¯õ-P® GßÚ ?
What is the use of Spark Plug ?

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26. QÍm-]ß ÷Áø»-PÒ ¯õøÁ ?
What are the functions of Clutch ?

27. \U-P-µz-vß ÷Áø» GßÚ ?
What is the working of Wheel ?

28. ÷hõ Cß £ØÔ ]Ö-S-Ô¨¦ Áøµ-P.
Give short notes about Toe in.

£Sv & III / PART - III
SÔ¨¦ : GøÁ÷¯Ý® I¢-x Â-ÚõU-P-ÐUS Âøh¯-ÎU-P-Ä®. ÂÚõ Gs 35 &US
Pmhõ¯©õP Âøh-¯-ÎUP-Ä®. 5x5=25
Note : Answer any five questions. Question No. 35 is compulsory.

29. uõ-Û-¯[Q Áõ-PÚ Ai¨-£-k-øP-°À EÒÍ Aø©¨-¦-PøÍ ÂÁ-›U-P-Ä®.
Explain automobile vehicle chassis.

30. ÷|º £Ø-\U-P-µ® (spur gear) £ØÔ ÂÁ-›U-P-Ä®.
Describe about spur gear.

31. h¯õ¨-µ® QÍm-]ß £h® Áøµ¢x £õ-P[-PøÍU SÔU-P-Ä®.
Draw and mark the parts of Diaphragm Clutch.

32. vµ-Á uøh Aø©¨-¤À ~øÇ¢-xÒÍ PõØ-ÖU SªÌ }U-S® ö\´-•-øÓ-ø¯¨ £ØÔ
GÊ-xP.
Write the procedure of removing air bubbles in hydraulic brake system.

33. ¦öµõ¨-£À-»º åõ¨-iß £h® Áøµ¢x £õ-P[-PøÍU SÔ-.
Draw and mark the parts of propeller shaft.

34. H÷u-Ý® J¸ ÁøP £møh ÂÀ öuõ-S¨¦ £h® Áøµ¢x £õ-P[-PøÍU SÔ.
Draw any one type of leaf spring and indicate the parts.

35. i[-P-›[ ö\´-¯z ÷uøÁ-¯õÚ E£-P-µ-n[-PÒ ¯õøÁ ?
What are the tools used for tinkering ?

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£Sv & IV / PART - IV
SÔ¨¦ : A- ø Úz- x ÂÚõU- P - Ð U- S ® Âøh¯- Î U- P - Ä ®. ÷uøÁ- ¯ õÚ Ch[- P - Î À
£h® ÁøµP. 2x10=20
Note : Answer all the questions. Draw diagram wherever necessary.

36. (A) J¸ umk QÍm-]ß £h® Áøµ¢x ÂÁ-›U-P-Ä®.
AÀ»x
(B) J¸-Á-øP ¤ß Aa_ (Rear Axle) Aø©¨ø£ £hz-x-hß ÂÁ-›U-P-Ä®.
(a) Draw and explain about single plate clutch.
OR
(b) Explain the construction of any one rear axle with a suitable sketch.

37. (A) PõØÖ uøh Aø©¨-¤ß ÷Põmk Áøµ-£-h® Áøµ¢x ÂÁ-›U-P-Ä®.
AÀ»x
(B) G»Um- µ õ- Û U CU- Ü - \ ß Aø©¨- ¤ ß Aø©¨- ø £- ² ®, ÷Áø» ö\´- ² ®
Âuz-øu-²® £hz-x-hß ÂÁ-›U-P-Ä®.
(a) Draw the line diagram of air brake and describe it.
OR
(b) Describe the construction and working principle of an electronic ignition system with a
neat sketch.

-o0o-

[ v¸¨¦P / Turn over

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
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HC Verma Chapter Wise Solutions
RD Sharma Solutions
CGBSE Solutions