TN 11th Question Paper 2025 Basic Mechanical Engineering

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8476
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Part III — Vocational Subjects
Ai¨£øh C¯¢vµÂ¯À - -P¸zv¯À
BASIC MECHANICAL 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¨£mh |õßS ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯ Âøhø¯
÷uº¢öukzx 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

8476 2

1. C¯[-QU öPõs-i-¸U-S® C¯¢-v-µzøu öuõ-h-÷Áõ, Auß «x \õ´¢x {Ø-P-÷Áõ
Thõx GßÓ £õ-x-Põ¨¦ :
(A) C¯¢-vµ £õ-x-Põ¨¦
(B) £o-©-øÚ £õ-x-Põ¨¦
(C) C¯¢-vµ £o-¯õͺ £õ-x-Põ¨¦
(D) øPU-P-¸Â £õ-x-Põ¨¦
What kind of safety rule, while the operator rests his body on the running of the machine ?

(a) Safety precaution for machine tools

(b) Workshop safety precaution

(c) Safety precaution for operators

(d) Safety precaution for hand tools

2. 1000×700×25 AÍ-ÄÒÍ Áøµ-£-h¨-£-»-øP-°ß ö£¯º :

(A) D2 (B) D0 (C) D3 (D) D1
Drawing boards with dimensions of 1000×700×25 is designated as :

(a) D2 (b) D0 (c) D3 (d) D1

3. •uÀ ÷Põn ¦öµõ-öáU-\-ÛÀ, ÷©À-£UP ÷uõØ-Ó® Aø©-²® Ch® :
(A) •ß-£UP ÷uõØ-Óz-vß Á»-x-¦-Ó®
(B) •ß-£UP ÷uõØ-Óz-vß ÷©À-¦-Ó®
(C) •ß-£UP ÷uõØ-Óz-vß RÌ-¦-Ó®
(D) •ß-£UP ÷uõØ-Óz-vß Ch-x-¦-Ó®
In first angle projection the top view is placed :

(a) Right side of the front view

(b) Above the front view

(c) Below the front view

(d) Left side of the front view

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4. öu›¢-v-µõu Pm-høÍPøÍ £Ø-Ô¯ Eu-Â-ø¯¨ ö£Ó G¢u ö\¯À-•øÓ AÀ-»x Âø\
£¯ß-£-k-Q-Óx ?
(A) F3 (B) F1 (C) F5 (D) F8
Which function is used for getting help on unknown command ?
(a) F3 (b) F1 (c) F5 (d) F8

5. ¤ß-Á-¸-Á-Ú-ÁØ-ÖÒ Gx Áøµ-uÀ vø\-ø¯ AÔ-¯ Eu-Ä-Q-Óx ?
(A) SÖUS CøÇ-PÒ (Cross Hairs)
(B) ÁÈ-Põmi £møh (Navigation Bar)
(C) {ø»-ø© £møh (Status Bar)
(D) PÚ-\-x-µ® (View Cube)
Which of the following is used to know the direction of drawing ?
(a) Cross Hairs
(b) Navigation Bar
(c) Status Bar
(d) View Cube

6. EÒÎhØÓ Áõº¨¦ ö\´-¯¨ £¯ß-£-k® ö£õ-¸Ò Gx ?
(A) ©õ-v› Aa-_ (B) kÁÀ ¤ß
(C) Áõº¨-¦¨ ö£mi (D) EÒÍ-P®
Which is used for making hollow casting ?
(a) Pattern (b) Dowel pin
(c) Moulding box (d) Core

7. BØ-Ö¨-£-k-øP-°À QøhU-S® ©nÀ ÁøP __________.
(A) ]Ó¨¦ ©s
(B) C¯ØøP ©s
(C) C¯ØøP ©s ©Ø-Ö® ö\¯ØøP ÷\º© ©s
(D) ö\¯ØøP ÷\º© ©s
Which sand is available at river beds ?
(a) Special sand
(b) Natural sand
(c) Natural sand and Synthetic sand
(d) Synthetic sand

[ v¸¨¦P / Turn over

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8. GL-øP £u¨-£-kz-x-Á-uß ÷|õU-P® :
(A) ]uÖ® uß-ø©ø¯ SøÓUP
(B) A›¨-¦ Gvº¨¦z ußø© Av-P-›UP
(C) C¯¢-v-µ¨-£o ö\´-²® ußø©-ø¯ ÷©®-£-kz-u
(D) E÷»õ-Pz-vß Pi-Ú uß-ø©ø¯ Av-P-›U-P
The purpose of tempering in steel is :
(a) To decrease the brittleness
(b) To improve corrosion resistance
(c) To improve Machinability
(d) To increase the hardness of the metal

9. D¯z-vß SÔ-±k :
(A) Zn (B) Al (C) Pb (D) Cu
Symbol of Lead :
(a) Zn (b) Al (c) Pb (d) Cu

10. E¸øÍ ÁiÁ P®-¤-°ß •P¨-¤À ø©¯® Põn Eu-Ä® øPU-P-¸Â :
(A) EÒÍÍÄ Põ-¼-£º (B) öÁÎ-¯ÍÄ Põ-¼-£º
(C) £[-Q-k® P¸- (D) öáßÛ Põ-¼-£º
Centre of face of a round rod can be found with a :
(a) Inside Caliper (b) Outside Caliper
(c) Divider (d) Jenny Caliper

11. Pøh-\À C¯¢-v-µz-vÀ E¸-øÍ Ái-Á P®-¤-P-Îß ø©¯® Põn Eu-Ä® P¸- :
(A) V-¤ÍõU (B) ©õºU-Q[ ÷h¤Ò
(C) B[-QÒ ¤÷Ím (D) AøÚz-vØ-S® HØÓ \º-÷£ì ÷Pä
The tool used for finding centre of a round rod in a lathe is :
(a) V-Block (b) Marking table
(c) Angle plate (d) Universal surface gauge

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12. \õ ö\´¯ £¯ß-£-k® E÷»õ-P® :
(A) Áõº¨-¤-¸®-¦ (B) h[ì-hß
(C) Põ-Ÿ-¯® (D) GL-S
Keys are made of :
(a) Cast Iron (b) Tungston
(c) Lead (d) Steel

13. £À-¼-øn-°-ß ÷ÁP® Põ-q® Áõ´¨-£õk :
T1 N2
(A) T = N (B) D1N1=D2N2
2 1

N T − NA
(C) RPM (D) × 100
NT
Velocity ratio of a gear drive is :

T1 N2
(a) = (b) D1N1=D2N2
T2 N1

N T − NA
(c) RPM (d) × 100
NT

14. ªß-Ú-Êz-uz-vß A»-S :
(A) \x-µ «m-hº (B) ÷ÁõÀm
(C) QÀ-£ºm (D) öÁ¨-£º
The unit of voltage is :
(a) Square Meter (b) Volt
(c) Gilbert (d) Weber

15. ªß-P-hz-v-°À G»Um-µõß-P-Î-ß Km-h® __________ BS®.
(A) ªß-Ú-Êz-u® (B) ªß-÷Úõm-h®
(C) ÷©õm-hõº (D) ªß-u-øh
The flow of electrons in a conductor is called __________.
(a) Volt (b) Current
(c) Motor (d) Resistance

[ v¸¨¦P / Turn over

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

16. öuõ-ÈØ-\õ-ø»-P-Îß ÁøP-PÒ ¯õøÁ ?
How Industries are classified ?

17. £õ-x-Põ¨¦ Gß-ÓõÀ GßÚ ?
What is Safety ?

18. ‰ß-Óõ-Áx ÷Põn ÁøP £h® Gß-ÓõÀ GßÚ ?
What is third angle projection ?

19. £›-©õ-n-ª-hÀ Gß-ÓõÀ GßÚ ?
What is dimensioning ?

20. öÁm-kz ÷uõØ-Óz-vß ÁøP-PÒ ¯õøÁ ?
What are the types of sectional views ?

21. Buõµ AÍÄ Gß-ÓõÀ GßÚ ?
What is Basic size ?

22. vª-]ß (Rammer) £¯ß GßÚ ?
What is the use of 'Rammer' ?

23. ö£õ-Ô-°-¯À ö£õ¸mPÎß £s-¦-PÒ ]»-ÁØøÓ £mi¯¼kP.
List out some properties of Engineering materials.

24. ¦ÒÎ Szx® P®¤°ß (Punch) ÁøPPøÍU SÔ¨¤kP.
Mention the types of Punches.

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25. \[U \õ塧 ÁøP-PÒ ¯õøÁ ?
What are the types of sunk keys ?

26. H÷u-Ý® Cµsk £À-¼-øn-PÒ £ØÔ TÖP.
State any two forms of gear.

27. ªß-uøh Gß-ÓõÀ GßÚ ?
What is resistance ?

28. ªß-÷©õm-hõ-›À EÒÍ £õ-P[-PÒ H÷u-Ý® |õß-Q-øÚU TÖ-P.
Mention any four parts of a motor.

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

29. PÈ-Ä ÷\ª¨¦ öPõÒ-P-»ß-P-Î-ß öÁÆ-÷Á-Ö Ás-n[-PøÍ £mi¯¼mk Auß
E£-÷¯õ-Pz-øuU TÖ-P.
List the different coloured bins for collection of waste and state their uses.

30. Cøn¨-¤ß Aø©¨¦ •øÓ-PÒ (System of fit) £ØÔ ÂÍU-SP.
Explain about the systems of fit.

31. Aa_ ©s-oß £s-¦-PøÍ ÂÍU-SP.
Explain the characteristics of Moulding Sand.

32. øPU-P-¸-Â-P-Îß ÁøP-Pøͨ £m-i-¯-¼-kP.
List out the types of hand tools.

[ v¸¨¦P / Turn over

8476 8

33. ©øµ-°ß ÁøP-PÒ ©Ø-Ö® £¯ß-PøÍU TÖP.
Mention the types of thread and its uses.

34. £møh •øÓ-°ß {øÓ-PÒ ©Ø-Ö® SøÓ-PÒ ¯õøÁ ?
What are the advantages and disadvantages of belt drive ?

35. w Aøn¨-£õ-Ûß ÁøP-PÒ H÷u-Ý® |õß-Q-øÚ¨ £ØÔ ÂÍU-SP.
Explain any four types of fire extinguishers.

£Sv & IV / PART - IV
SÔ¨¦ : ›-ÁõP Âøh¯ÎUPÄ®. 2x10=20
Note : Answer the following questions in detail.

36. (A) Bm-÷hõ-÷P-iÀ £¯ß-£-kz-u¨-£-k® £À-÷ÁÖ Âø\¨-£-»-øP-°ß SÖUS
ÁÈ-PÒ £ØÔ ÂÁ-›U-P-Ä®.
AÀ»x
(B) ©õ-v› Ái-Á® ö\´-¯¨ £¯ß-£-k® ö£õ-¸m-PøÍ ÁøP¨-£-kzv, AÁØ-ÔÀ
H÷uÝ® Cµs-iøÚ ÂÍU-SP.
(a) Describe about the various shortcut keys used in AutoCAD.
OR
(b) List out the materials for making patterns and explain any two of them.

37. (A) öÁº- Û - ¯ º Põ- ¼ ¨- £ - ¸ U- S ®, ø©U- ÷ µõ «m- h - ¸ U- S ® EÒÍ ÷ÁÖ- £ õ- k - P Ò
¯õøÁ ?
AÀ»x
(B) uØ- P õ- ¼ P ©Ø- Ö ® {µ¢- u µ Cøn¨- ¦ - P - Ð U- Q - ø h- ÷ ¯- ¯ õÚ ÷ÁÖ- £ õ- k - P øÍ
GÊ-x-P.
(a) What are the differences between vernier caliper and micrometer ?
OR
(b) Write the differences between Temporary fasteners and Permanent fasteners ?

-o0o-

Study Materials
Notes

Model Papers Class 6 Notes

Sample Papers Class 7 Notes
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Class 9 Notes
Important Resources
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Periodic Table
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