TN 12th Question Paper 2023 Basic Mechanical Engineering

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 8
6681
!6681BasicMechaEnginee! £vÄ Gs
Register Number

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_¨£vÂÀ 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.

[ v¸¨¦P / Turn over

6681 2

1. £õ¼æ[ ÷»z __________ ÁøPø¯a \õº¢ux.
(A) Av÷ÁP Pøh\À (B) Gßâß ÷»z
(C) uõÛ¯[Q Pøh\À (D) lÀ ¹® ÷»z
Polishing lathe is a type of :
(a) High speed lathe (b) Engine lathe
(c) Automatic lathe (d) Tool room lathe

2. xøÍ°k® A»Qß Eumk \›ÄU ÷Põn® :
(A) 128 •uÀ 158 (B) 598 (C) 1358 (D) 1188
The lip clearance angle of a drill is :
(a) 128 to 158 (b) 598 (c) 1358 (d) 1188

3. E¸Áø©US® ö£õÔ°À £¯ß£kzu¨£k® Sꨣkzx® vµÁzvß ö£¯º :
(A) ÂÍUöPsön´ (B) \õ¾¤Ò B°Ò
(C) S¹m B°À (D) uspº
The suitable coolant oil used in the shaping machine :
(a) Castor oil (b) Soluble oil
(c) Crude oil (d) Water

4. AvP PiÚz ußø© Eøh¯ C¯ØøP Aøµ¨¦z yÒ :
(A) öPõµsh® (B) ©nØPÀ (C) G©› (D) øÁµ®
The hardest natural abrasive is :
(a) corundum (b) sandstone (c) emery (d) diamond

5. 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
Production is achieved by __________.
(a) Men, Machine, Materials and tools
(b) Man and Machine

(c) Men and tools
(d) Materials and tools

3 6681

6. ªÀ¼[ C¯¢vµzvÀ öÁmkU P¸Â°À EÒÍ J¸ ¦ÒÎ J¸ {ªh ÷|µzvÀ
|P¸® yµ® :
(A) _ÇØÔ ÷ÁP® (B) öÁmk® ÷ÁP®
(C) Fmh® (D) öÁmk® BÇ®
The distance travelled by a point on a Milling Cutter in one minute is known as :
(a) spindle speed (b) cutting speed
(c) feed (d) depth of cut

7. ÷©À ÷|õUQ¯ x¸ÁÀ •øÓ°ß ©ØöÓõ¸ ö£¯º GßÚ ?
(A) ÁiÁ ªÀ¼[ (B) ìi÷µhÀ ªÀ¼[
(C) Tmk ªÀ¼[ (D) ÁÇUP©õÚ ªÀ¼[
What is the other name of up milling method ?
(a) Form milling (b) Straddle milling
(c) Gang milling (d) Conventional milling

8. vÚ¨ £µõ©›¨¦ Gߣx :
(A) C¯¢vµ® ö\¯»ØÖ¨ ÷£õÚ÷£õx ÷©ØöPõÒЮ £µõ©›¨¦
(B) ÁÇUP¨ £µõ©›¨¦
(C) v¸zv Aø©US® ÷Áø»
(D) uk¨¦¨ £µõ©›¨¦
Daily maintenance is :
(a) Breakdown maintenance
(b) Routine maintenance
(c) Corrective maintenance
(d) Preventive maintenance

9. ì÷£ÚøµU Psk¤izuÁº :
(A) \õ»©ß ö©º›U (B) G¼ öÁmÛ
(C) ÷áõ\¨ Bº. ¨öµÍß (D) ÷á®ì |õìªz
Spanner was invented by :
(a) Solymen Merrick (b) Eli Whitney

(c) Joseph R. Brown (d) James Nasmith

[ v¸¨¦P / Turn over

6681 4

10. E¸Q¯ {ø» öÁÀi[ Gߣx :
(A) ªßuøh öÁÀi[ (B) AÊzu öÁÀi[
(C) öuºªm öÁÀi[ (D) AÊzuªÀ»õ öÁÀi[
Fusion welding is :
(a) Resistance welding (b) Pressure welding
(c) Thermit welding (d) Non-pressure welding

11. ÷Pì öÁÀi[ ö\´¯ £¯ß£k® ÷Pì ]¼sh›À EÒÍ A]mi¼ß Áõ²Âß
AÊzu® :
(A) 100 kg/cm2 (B) 16 kg/cm2 (C) 14 kg/cm2 (D) 125 kg/cm2
The pressure of acetylene in the cylinder of gas welding equipment is :
(a) 100 kg/cm2 (b) 16 kg/cm2 (c) 14 kg/cm2 (d) 125 kg/cm2

12. C®ö£À»º __________ À EÒÍx.
(A) ø©¯Â»US £®¦
(B) •ßÝ® ¤ßÝ® C¯US® £®¦
(C) ÷Áß £®¦
(D) Q¯º £®¦
Impeller is a part found in a :
(a) Centrifugal pump
(b) Reciprocating pump
(c) Vane pump
(d) Gear pump

13. vµÁ¯À \Uvø¯ C¯¢vµ \Uv¯õP ©õØÖ® \õuÚzvß ö£¯º :
(A) øímµõ¼U ÷©õmhõº (B) øímµõ¼U £®¦
(C) øímµõ¼U ÁõÀÄ (D) øímµõ¼U ]¼shº
A device which transforms hydraulic energy into mechanical energy is :
(a) Hydraulic motor (b) Hydraulic pump

(c) Hydraulic Valve (d) Hydraulic cylinder

5 6681

14. G»õìiU Aøµ¨¦a \UPµ® ö\´¯¨ £¯ß£k® ¤i©õÚ¨ ö£õ¸Ò Gx ?
(A) AµUS (B) Cµ¨£º (C) ]¼U÷Pm (D) Âm›ø£k
Which bond is used to make the Elastic Grinding Wheel ?
(a) Shellac (b) Rubber (c) Silicate (d) Vitrified

15. ©Ûu C¯¢vµzvÀ £À÷ÁÖ PmhøÍPøÍ EÒÁõ[Q Pmk¨£õmk P¸ÂUS
Gkzxa ö\À¾® •UQ¯ £õPzvß ö£¯º :
(A) En› (B) Pmk¨£õmk P¸Â
(C) ¤ìhß (D) £Ø\UPµ[PÒ
The important part which receives the commands and sends to the control system
in Robot is :
(a) Sensor (b) Control system
(c) Piston (d) Gears

£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. Pøh\À C¯¢vµzvß _ÇÀÂmh® GßÓõÀ GßÚ ?
What is swing diameter ?

17. PÆÂPÒ GßÓõÀ GßÚ ?
What are Chucks ?

18. xøÍ°k® A»QÀ L¦Ñmiß £¯ßPÒ ¯õøÁ ?
What are the uses of “Flute” in a drill ?

19. _ÇÀÁøP öÁmkÎz uø»°ß £¯ßPøÍU TÖP.

What is the use of swivel tool head of a shaping machine ?

[ v¸¨¦P / Turn over

6681 6

20. Q÷Í][ GßÓõÀ GßÚ ?
What is meant by “glazing” ?

21. ÁiÁ ªÀ¼[Qß £¯ß ¯õx ?
What is the use of Form Milling ?

22. ÷u´©õÚ® Gߣx ¯õx ?
What is meant by “wear” ?

23. 60 ª.«. Âmh•ÒÍ ªÀ¼[ öÁmkU P¸Â°øÚ¨ £¯ß£kzv {ªhzvØS 250
_ØÖPÒ ÷ÁPzvÀ ªÀ¼[ ö\´¯z ÷uøÁ¯õÚ öÁmk® ÷ÁPzøuU PnUQkP.
Calculate the cutting speed to perform milling with a cutter of diameter 60 mm
and spindle speed of 250 rpm.

24. G»Um÷µõkPÎß ÁøPPøÍ GÊxP.
What are the types of electrodes ?

25. xøÍ _µsku¾US®, xøÍ ö£¸USu¾US® EÒÍ ÷ÁÖ£õkPÒ CµsiøÚU
TÖP.
State any two differences between the process of reaming and boring.

26. ""¤øµª['' GßÓõÀ GßÚ ?
What is “priming” ?

27. EÒÏmk FhP® £ØÔ ÂÁ›UPÄ®.
Explain “Input Media”.

28. ö©ßö£õ¸Ò GßÓõÀ GßÚ ?

What is ‘Software’ ?

7 6681

£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® 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. hµm ÷»zvØS®, ÷P¨ìhß ÷»zvØS® EÒÍ ÷ÁÖ£õkPÒ H÷uÝ® I¢vøÚ
TÖP.
Mention any five differences between a turret and a capstan lathe.

30. xøÍ°k® A»QøÚ ¤iUS® •øÓPÎÀ CµsiøÚ £h® Áøµ¢x ÂÍUSP.
Explain any two types of drill holding devices.

31. ]Ö SÔ¨¦ ÁøµP :
(A) »õ¨¤[ (B) ÷íõÛ[
Write short notes on :

(a) Lapping (b) Honing

32. •ßÝ® ¤ßÝ® C¯[S® £®¤ß ÁøPPøÍU TÖP.
What are the types of reciprocating pump ?

33. E¯Âh¼ß ÷|õUP[PÒ ¯õøÁ ?
Explain the purposes of lubrication.

34. ÷Pì öÁÀi[Qß {øÓPøÍ TÖP.
State the advantages of gas welding.

35. ªß •»õ® §_uø» £h® Áøµ¢x ÂÍUSP.

Explain Electroplating with a neat diagram.

[ v¸¨¦P / Turn over

6681 8

£Sv & IV / PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 2x10=20
Note : Answer all the questions.

36. (A) Pøh\À C¯¢vµzvÀ ö\´¯¨£k® ÷Áø»PÒ H÷uÝ® CµsiøÚ
£hzxhß ÂÍUSP.
AÀ»x
(B) £õÀ ©ØÖ® ÷µm\m C¯¢vµ ~m£zøu £h® Áøµ¢x ÂÍUSP.
(a) Explain any two operations performed in lathe with neat sketch.
OR
(b) Explain the Pawl and Ratchet mechanism with a diagram.

37. (A) Aøµ¨¦a \UPµzøu ö£õ¸zx® •øÓø¯ £hzxhß ÂÁ›UPÄ®.
AÀ»x
(B) vmhªmh £µõ©›¨¦a ö\¯À GߣuøÚ ÂÍUSP.
(a) Explain ‘Mounting’ of a grinding wheel with a suitable diagram.
OR
(b) Explain “Planned maintenance program”.

-oOo-