TN 12th Question Paper 2026 Basic Mechanical Engineering

FOR TN 12TH EXAM PREPARATION

TN 12th 2026
Question Paper · Basic
Mechanical
Engineering
EXAM YEAR TYPE SUBJECT

TN 12th 2026 Question Paper Basic Mechanical Engineering

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 8
9081
!9081BasicMechaEnginee! £vÄ Gs
Register Number

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( / Tamil & English Version )

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 90

Time Allowed : 3.00 Hours ] [ Maximum Marks : 90

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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.

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a ÷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.

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9081 2

1. -Pøh\À C¯¢vµzvÀ öÁmk® ÷ÁP® Põn £¯ß£k® `zvµ® :
π DN
(A) 2
πr h (B) «/{
1000

D− d L d −d
1 2
(C) S= × (D)
2 l 2l

The formula for finding the cutting speed in a lathe is :

π DN
2
(a) πr h (b) m min
1000

D− d L d −d
1 2
(c) S= × (d)
2 l 2l

2. Av÷ÁP Pøh\À C¯¢vµzvß ÷ÁP® :
(A) _©õº 2000 - 2400 rpm (B) _©õº 600 - 1000 rpm

(C) _©õº 3500 - 4000 rpm (D) _©õº 1200 - 3200 rpm

The spindle speed of high speed lathe is around :

(a) 2000 - 2400 rpm (b) 600 - 1000 rpm

(c) 3500 - 4000 rpm (d) 1200 - 3200 rpm

3. \›Ä \õ ö\´¯¨£k® E÷»õP® :
(A) PiÚ GLS (B) Põº£ß GLS
(C) Av÷ÁP GLS (D) öÁmkÎ GLS
The drift is made up of :

(a) Hard steel (b) Carbon steel

(c) High speed steel (d) Tool steel

4. ÷ÁP©õP v¸®£ ö\´²® C¯¢vµ ~m£zvß ‰»® •ßÝ® ¤ßÝ® C¯[S®
£õP® :
(A) ÷\iÀ (B) £o÷©øh (C) SÖUS |P› (D) vª_
The part involved in reciprocation by Quick return is :

(a) Column (b) Work table (c) Cross rail (d) Ram

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5. PiÚ Aøµ¨¦z yøÍ, ¤i©õÚ ö£õ¸Ò CÖUP©õP ¤izxÒÍx Gߣx Gøu
SÔUQÓx ?
(A) Aøµ¨¦ \UPµzvß EÒ Aø©¨¦ (B) Aøµ¨¦z yÎß AÍÄ
(C) Aøµ¨¦zyÎß ÁøP (D) Aøµ¨¦ \UPµzvß uµ®
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The Grip with which the bond holds the abrasive is known as :
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(a)
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Structure of Grinding wheel (b) Grain size

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(c) Type of abrasive (d) Grade of Grinding wheel

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6. AµUSa¤i©õÚ ö£õ¸Îß SÔ±k :
(A) S (B) B (C) E (D) C

The symbol of shellac bond is :

(a) S (b) B (c) E (d) C

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7. £ÒÍ® ©ØÖ® \õ¨£ÒÍ® öÁmh £¯ß£k® öÁmkU P¸Â :
(A) ÷Põn ªÀ¼[ öÁmkUP¸Â
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(B) öÁmi xshõUS® öÁmkUP¸Âs
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(C) ÁiÁ ªÀ¼[ öÁmkUP¸Âg
(D) •øÚ ªÀ¼[ öÁmkUP¸Â
The cutter used for cutting grooves and key ways :

(a) Angle milling cutters

(b) Slitting saw

(c) Form cutter

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(d) End mill cutters

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8.

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(A) EÒÏk HØS® A»S
(C) Pmk¨£õmk A»S (D) «ÒuµÄ A»S
Which unit serves as a link between the memory unit and output unit ?

(a) Input reading unit (b) Processing unit

(c) Control unit (d) Feedback unit

[ v¸¨¦P / Turn over

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9081 4

9. £møh, ÷£›[, \[Q¼ ÷£õßÓÁØøÓ £µõ©›zuÀ :
(A) uk¨¦ £µõ©›¨¦ (B) vÚ £µõ©›¨¦
(C) ö£¸® £Êx£õº¨¦ (D) Áõµ¨ £µõ©›¨¦
Maintenance of belt, bearing and chain is :

(a) Preventive Maintenance (b) Daily Maintenance

(c) Corrective Maintenance (d) Weekly Maintenance

10. BºU öÁÀi[ ‰»® HØ£k® öÁ¨£zvß AÍÄ :
(A) 50008C - 60008C (B) 1008C - 1508C

(C) 1508C - 2008C (D) 508C - 1008C

The heat generated during arc welding is :

(a) 50008C - 60008C (b) 1008C - 1508C

(c) 1508C - 2008C (d) 508C - 1008C

11. u¯õ›¨¦ £o Gߣx __________ BÀ \õzv¯©õQÓx.
(A) ©Ûuß, C¯¢vµ®, ‰»¨ö£õ¸Ò ©ØÖ® öÁmkÎPÍõÀ
(B) ©Ûuß ©ØÖ® C¯¢vµzuõÀ
(C) ©Ûuß ©ØÖ® öÁmkÎPÍõÀ
(D) ‰»¨ö£õ¸Ò ©ØÖ® öÁmkÎPÍõÀ
Process of Production is achieved by :

(a) Man, Machine, Materials and tools

(b) Man and Machine

(c) Man and tools

(d) Materials and tools

12. ©Ûu C¯¢vµzvÀ, £À÷ÁÖ PmhøÍPøÍ EÒÁõ[Q Pmk¨£õmk P¸ÂUS
Gkzx ö\À¾® •UQ¯ £õPzvß ö£¯º :
(A) En› (B) Pmk¨£kzv (C) ¤ìhß (D) £Ø\UPµ[PÒ
The part which receives the commands and sends to the control system in robot is :

(a) Sensor (b) Controller (c) Piston (d) Gears

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13. ©Ûu C¯¢vµzvß Ai¨£øh öPõÒøPPøÍ ÁSzuÁº :
(A) áõºä öhÂÀ (B) A]÷©õÆ
(C) ÷áõ\¨ ÷µ[PÀ ö£ºöẠ(D) öíU÷hº
The basic principles of Robot is formed by :

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(a) George Devil (b) Asimov

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(c) Joseph Rengal Berger (d) Hectare

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F.W. (B) öíßÔ L÷£¯õÀ
(C) L£õµ÷h (D) ¤¯º öÁºÛ¯º
Father of ‘Scientific Management’ is :

(a) F.W. Taylor (b) Henry Fayol

(c) Faraday (d) Pierre Vernier

15. ö\»Ä ©v¨¥miÀ, Pa\õ¨ ö£õ¸mPøÍ BU\õ ‰»® öÁmkuÀ :
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(A) Pa\õ¨ ö£õ¸mPÎß ö\»Ä (B) {ºÁõPa ö\»Ä
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(C) Á›aö\»Ä (D) £o¯õͺ Fv¯®
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In which cost Estimation charges of Hacksaw cutting performed ?

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(a)

(c)
Cost of raw materials

Cost of tax
a (b)

(d)
Administrative expenditure

Wages for the worker

£Sv & II / PART - II

SÔ¨¦ : H÷uÝ® £zx ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 28 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 10x3=30

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Note : Answer any ten questions. Question No. 28 is compulsory.

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16.

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What are the uses of “Flute” in a drill ?

18. Av ~qUP xøÍ°k® C¯¢vµzvß ÷uøÁ ¯õx ?
What is the need for super sensitive drilling machine ?

[ v¸¨¦P / Turn over

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9081 6

19. E¸Áø©US® C¯¢vµzvß £õP[PÒ |õßQøÚ GÊxP ?
List any four parts of shaper.

20. E¸Áø©US® C¯¢vµzvÀ vªø\, ÷ÁP©õP v¸®£ ö\´²® C¯¢vµ ~m£[PÒ
¯õøÁ ?
What are the mechanisms used for Quick return of the ram in shaper ?

21. umøh £µ¨¦ Aøµ¨¦ C¯¢vµzvß ÁøPPÒ |õßQøÚ GÊxP.
What are the four types of surface grinders ?

22. ÷\mh›[ HØ£kÁuØPõÚ Põµn[PÒ ¯õøÁ- ?
What are the reasons for Chattering ?

23. ªÀ¼[ C¯¢vµzvß _ÇØÔ°À ªÀ¼[ öÁmkU P¸Âø¯ ¤iUS® \õuÚ[PÒ
¯õøÁ ?
What are the methods of holding milling cutters on the machine spindle ?

24. £µõ©›zu¼ß ÷|õUP® ¯õx ?
What is the objective of Maintenance ?

25. Pmk¨£õmk Ai¨£øh°À C¯[S® uõÛ¯[Q •øÓPÒ ¯õøÁ ?
What are the various types of automation based on control methods ?

26. CNC C¯¢vµzvß SøÓPÒ ¯õøÁ ?
What are the disadvantages of CNC Machine ?

27. ö©ßö£õ¸Ò GßÓõÀ GßÚ ?
What is meant by Software ?

28. vmhªmh £µõ©›¨¦ ö\¯ø» Áøµ¯ÖUPÄ®.
Define a Planned Maintenance.

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£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® I¢x ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 35 &US
Pmhõ¯® Âøh¯ÎUPÄ®. 5x5=25

Note : Answer any five questions. Question No. 35 is compulsory.
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29.

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i›À PÆ GßÓõÀ GßÚ ? Auß ÁøPPøÍ SÔ¨¤kP.
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What is meant by drill chuck and its types ?

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SÔ¨¦aÁøµP.
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(A) vª]ß C¸¨¤h® ©õØÖ® Âu®
(B) vª]ß C¸¨¤h®
Write short notes on :

(a) Changing the stroke length of the ram.

(b) Position of the ram.

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W A 46

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K
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÷©ØPsh Gs ©ØÖ® GÊzvß ö£õ¸øÍU TÖP.
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A grinding wheel is specified as follows :

W A 46 K 5 V 17

Explain the meaning of each symbol.

32. ÁÇUP £µõ©›¨¤øÚ ÂÁ›UPÄ®.
Explain Routine Maintenance.

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©Ûu C¯¢vµzvß ÷uøÁPÒ ¯õøÁ ?
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33.

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What are the needs of robot ?

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g la a JÊUS Áøµ£h®
Gsq¸ Pmk¨£õmk Aø©¨¤ß ö\¯À£õk £ØÔ¯
34.

a ÁøµP.
(flow-chart)

Draw a flow-chart of Numerical Control (NC) System.

35. BºU öÁÀi[, ÷Pì öÁÀi[ ÷ÁÖ£õkPÒ I¢vøÚ SÔ¨¤kP.
Mention any five differences between arc welding and gas welding.

[ v¸¨¦P / Turn over

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9081 8

£Sv & IV / PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 2x10=20

Note : Answer all the questions.

36. (A) AkUS T®¦ P¨¤°ß £h® Áøµ¢x ö\¯À£k® ÂuzvøÚ ÂÍUSP.
AÀ»x
(B) H÷uÝ® C¸ ªÀ¼[ öÁmkU P¸Â°ß £h® Áøµ¢x Auß Aø©¨¦
©ØÖ® £¯ß£õmøh ÂÍUSP.
(a) Explain with neat sketch, a step cone pulley drive mechanism.

OR

(b) Draw any two types of milling cutters and explain their structure and applications.

37. (A) BºU öÁÀi[ ö\¯À•øÓ°øÚ £hzxhß ÂÁ›UPÄ®.
AÀ»x
(B) {ºÁõP ö\»ÄPøÍ ÂÍUQ GÊxP.
(a) Explain Arc welding with diagram.

OR

(b) Write and explain the Administrative Expenditure.

- o 0 o -

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