TN 11th Question Paper 2025 Basic Automobile Engineering

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8480
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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. ABS &ß Â›-ÁõU-P® GßÚ ?
(A) Air Brake System (B) Anti-Lock Braking System
(C) Automatic Brake System (D) Anti Brake System
What is the expansion of ABS ?
(a) Air Brake System (b) Anti-Lock Braking System
(c) Automatic Brake System (d) Anti Brake System

2. Bº.¤.-G® ÷Pä £¯ß-£-k-Áx :
(A) Áõ-PÚ ø©÷»ä PnU-Q-h
(B) Gß-âß ÷ÁPz-øuU PnU-Q-h
(C) Áõ-PÚ £¯n yµzøu AÍ-Âh
(D) Áõ-PÚ ÷ÁPz-øuU PnU-Q-h
R P M gauge is used :
(a) To calculate the vehicle Mileage
(b) To measure the speed of the engine
(c) To measure the distance travelled by the vehicle
(d) To measure the speed of the vehicle

3. ^÷hß Gs ‰»® G¢u G›-ö£õ-¸-Îß uµzøu AÔ-¯-»õ® ?
(A) Áõ-² (B) ö£m-÷µõÀ
(C) GÀ.¤.-â (D) j\À
The quality of which fuel is known by cetane number :
(a) Gas (b) Petrol
(c) LPG (d) Diesel

4. E¢x Bµ® Gß-£x :
(A) Ãa_ }Íz-vß C¸ ©h[-S
(B) Ãa_ }Íz-vÀ £õ-v
(C) Ãa_ }Íz-vß ‰ßÖ ©h[-S
(D) BDC &US® TDC &US® EÒÍ yµ®
Crank throw is :
(a) Double times of the stroke length
(b) Half of the stroke length
(c) Three times of the stroke length
(d) The distance between BDC and TDC

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5. Sκ-ÂU-S® }¸-hß öuõ-hº¦ öPõÒÍõu ø»Úº Gx ?
(A) B°À (B) E»º (C) Áõ² (D) Dµ
Which liner does not contact with cooling water ?
(a) Oil (b) Dry (c) Gas (d) Wet

6. Gz-uøÚ ÁøP-¯õÚ j\À öuÎU-S® £®-¦-PÒ Gß-â-ÛÀ £¯ß-£-k-Qß-ÓÚ ?
(A) |õß-S (B) Cµs-k (C) I¢x (D) ‰ß-Ö
How many types of diesel injection pumps are used in engines ?

(a) Four (b) Two (c) Five (d) Three

7. Sκa- ] - ³ m- k ® }º EøÓ¢x Âhõ- © À C¸UP }¸- h ß P»U- P ¨- £ - k ®
÷Áv¨ö£õ-¸Ò Gx ?
(A) Gz-v-½ß QøÍU-PõÀ (B) A]m-÷hõß
(C) P¢-uP Aª-»® (D) «z-÷uß
Which chemical is mixed with water to prevent the freezing of cooling water ?
(a) Ethylene glycol (b) Acetone
(c) Sulphuric acid (d) Methane

8. G¢u ÁøP-¯õÚ E¯-Â-k® •øÓ C¸ \U-Pµ Áõ-P-Ú[-P-ÎÀ £¯ß-£-kz-u¨&
£k-Qß-ÓÚ ?
(A) AÊzu E¯Âk® •øÓ
(B) ö£m-µõ-°À E¯Âk® •øÓ
(C) Áõ› öuÎzx ©Ø-Ö® AÊzu E¯Âk® •øÓ
(D) Áõ› öuÎzx E¯Âk® •øÓ
What type of lubrication system is used in two wheelers ?
(a) Pressure lubrication system
(b) Petroil lubrication system
(c) Splash and pressure lubrication system
(d) Splash lubrication system

[ v¸¨¦P / Turn over

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9. Gßâß Av-P® öÁ¨-£-©-øh-Á-uØ-PõÚ Põ-µ-n® GßÚ ?
(A) Põº-¦-÷µm-hº ]Ó¨-£õP C¯[-P-ÂÀø»
(B) ÷µi-÷¯m-h-›À EÒÍ }›ß AÍÄ SøÓÄ
(C) ö£m-÷µõÀ AÍÄ SøÓ-Ä
(D) j\À AÍÄ SøÓ-Ä
What is the reason for engine over heating ?

(a) carburettor not functioning well

(b) low level of water in the radiator

(c) low level of petrol

(d) low level of diesel

10. G¢u uõÍõ- Ú x Áõ- P Ú £¯- n z- v ß •ß- ¦ ®, ¤ß- ¦ ® EÒÍ AøÚzx
ÂÁ-µ[-P-øÍ-²® u¸-Q-Ó-x ?
(A) £v-Äz uõÒ (B) £µõ-©-›¨-¦z uõÒ
(C) Bº.]. ¦z-u-P® (D) £¯-nz uõÒ
Which sheet gives all details of the vehicle, starting to ending of the trip ?

(a) Record sheet (b) Maintenance sheet

(c) R.C. Book (d) Trip sheet

11. Gß-âß-P-ÎÀ vÓ¨-£õß-PøÍz vÓUP £¯ß-£-k-Áx Gx ?
(A) ¤øÍ ÃÀ (B) ö|®-¦-¸Ò us-k
(C) ¤ì-hß (D) ÁøÍÁa-_z us-k
Which is used to open the valve in engines ?

(a) Fly wheel (b) Cam shaft

(c) Piston (d) Crank shaft

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12. RÌU-Ps-h-ÁØ-ÖÒ ö£õ-¸¢-uõu Jß-øÓz ÷uº¢-öuk :
(A) ö£ß-a øÁì
(B) ö£ßa xøÍ-°-k® C¯¢-v-µ®
(C) £Ø-Ó-øÁ¨¦ C¯¢-v-µ®
(D) ö£ßa ÷u´zx AøµU-S® C¯¢-v-µ®
Choose the odd one from the following :
(a) Bench vice
(b) Bench drilling machine
(c) Welding machine
(d) Bench grinding machine

13. TØÖ I : öÁÎ- ÷ ¯Ø- Ö ® J¼U- S - ø Ó¨- £ õß- P Ò öÁÎ- ÷ ¯- Ö ® Áõ- ² -  ß
\z-uz-øuU SøÓUP £¯ß-£-k-Q-Óx.
TØÖ II : ÂøÚ-³UQ ©õØÔ öÁÎ-÷¯-Ö® Áõ-²-Âß |a-_z uß-ø©-PøÍU
SøÓUP £¯ß-£-kQ-Ó-x.
(A) TØÖ I \›, TØÖ II uÁ-Ö
(B) TØÖ I ©Ø-Ö® II \›
(C) TØÖ I uÁÖ, TØÖ II \›
(D) TØÖ I ©Ø-Ö® II uÁÖ
Statement I : The exhaust mufflers are used to reduce the sound of exhaust gases.
Statement II : The catalytic convertor is used to reduce the harmful emissions in the
exhaust gases.
(a) Statement I is true, Statement II is false
(b) Statement I and II are true
(c) Statement I is false, Statement II is true
(d) Statement I and II are false

14. G¢u ÁøP G›-²® AøÓ-°À öÁ¨-£-‰mi £¯ß-£-kz-u¨-£-k-Q-Óx ?
(A) _ÇÀ-ÁøP G›-²® AøÓ- (B) K£-ß G›-²® AøÓ-
(C) ìS-°è ÁøP G›-²® AøÓ- (D) L¤-›&G›-²® AøÓ-
In which type of combustion chamber Glow plug is used ?
(a) Swirl combustion chamber (b) Open combustion chamber
(c) Squish combustion chamber (d) Pre-combustion chamber

[ v¸¨¦P / Turn over

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15. £¯-nz-vß •¢-øu¯ B´-ÂØS ö£õ-Ö¨-£õͺ ¯õº ?
(A) Áõ-PÚ E›-ø©-¯õͺ
(B) Ám-hõ-µ¨ ÷£õU-S-Á-µzx A¾-Á-»º
(C) Áõ-PÚ |-hz-x-Úº
(D) Áõ-PÚ Km-k-|º ©Ø-Ö® |-hz-xÚº
Who is responsible for pre-trip inspection ?
(a) Vehicle owner
(b) Road Transport Officer
(c) Vehicle conductor
(d) Vehicle driver and conductor

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

16. Ga-\-›UøP ]ß-Ú® Gß-ÓõÀ GßÚ ?
What is meant by cautionary sign ?

17. J¯º ÷Pâß £¯ß-PÒ ¯õøÁ ?
What are the uses of wire gauge ?

18. GÀ-.¤.â &ø¯ £ØÔ GÊ-xP.
Write about LPG.

19. öÁÎ G› Gß-â-ÝUS Euõ-µ-n[-PøÍU TÖ-P.
State the examples of external combustion engine.

20. AvºÄ uõ[Q Gß-ÓõÀ GßÚ ?
What is meant by Vibration Damper ?

21. |õ-]À-P-Îß ÁøP-P-øͨ £m-i-¯-¼-kP.
List out the types of nozzles.

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22. Áøµ-¯Ö & ÷µi-÷¯m-hº ¤µ-åº ÷P¨
Define Radiator pressure cap.

23. E¯-Â-k® •øÓ-°ß £¯ß-PÒ ¯õøÁ ?
What are the uses of lubrication system ?

24. j-\À |õU-Q[ £ØÔ ]Ö SÔ¨¦ ÁøµP.
Write short notes on Diesel Knocking.

25. Á¸-hõ¢-vµ B´Ä Gß-ÓõÀ GßÚ ?
What is meant by annual inspection ?

26. Põº-¦-÷µm-hº Gß-ÓõÀ GßÚ ?
What is Carburettor ?

27. C¯¢-v-µz vÓß & Áøµ-¯Ö.
Define Mechanical efficiency.

28. BU-÷hß Gs & Áøµ-¯-ÖU-P-Ä®.
Define Octane Number.

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

29. £Áº lÀ-P-Îß £À-÷ÁÖ ÁøP-PøÍU TÖP.
State the various types of power tools.

30. Bm-÷hõ-ö©õ-ø£À Áµ-»õØøÓ ÂÁ-›U-P-Ä®.
Describe the History of Automobile.

31. CNG Gß-ÓõÀ GßÚ ? Au-ß {øÓ-PøÍ GÊ-xP.
What is meant by CNG ? Write its merits.

[ v¸¨¦P / Turn over

8480 8

32. Cß-÷hU ]ì-hz-vß £õ-P[-PøÍ GÊ-xP.
Write the parts of intake system.

33. Gß-âß Av-P® öÁ¨-£-©-øh-Á-uõÀ HØ-£-k® ÂøÍ-Ä-PÒ ¯õøÁ ?
What are the disadvantages due to the over heat of the engine ?

34. Áõ-P-ÚU SÔ¨¦ £v-÷Ák & ÂÍU-S-P.
Explain vehicle log book.

35. £®¨ \ºU- S - ÷ »- \ ß Sκ-  U- S ® •øÓ- ° ß £h® Áøµ¢x, £õ- P [- P øÍU
SÔU-P-Ä®.
Draw the diagram of pump circulation cooling system. Label the parts.

£Sv & IV / PART - IV
SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. ÷uøÁ-¯õÚ Ch[-P-ÎÀ
£h® ÁøµP. 2x10=20

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

36. (A) P¸-Â-P-øÍ £¯ß-£-kz-x-Á-uØ-PõÚ £õ-x-Põ¨¦ Âv-•-øÓ-PøÍ ÂÍU-SP.
AÀ»x
(B) H.]. ö©U-Põ-ÛU-PÀ ö£m-÷µõÀ £®¨ C¯[-S® uz-x-Ázøu £hz-x-hß
ÂÍU-S-P.
(a) Explain safety precautions in using tools.
OR
(b) Draw and explain the working principle of A.C. Mechanical petrol pump.

37. (A) Cµsk Ãa_ ©Ø-Ö® |õßS Ãa_ Gß-âß-P-ÐU-SÒÍ ÷ÁÖ-£õ-k-PøÍ
Am-h-Á-øn¨-£-kz-x-P.
AÀ»x
(B) H÷u-Ý® J¸-Á-øP B°À £®-¤øÚ £hz-x-hß ÂÍU-SP.
(a) Tabulate the differences between two stroke and four stroke engines.
OR
(b) Explain any one type of the oil pump with a diagram.

-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

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