TN 12th Question Paper 2022 Basic Mechanical Engineering

No. of Printed Pages : 8
5981
!5981BasicMechaEnginee! £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.

5981 2

1. Pøh\À C¯¢vµzvÀ öÁmk® ÷ÁP® Põn £¯ß£k® `zvµ® :
πDN D−d L d1 − d2
(A) πr2h (B) 1000 (C) × (D)
2 l 2l

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

πDN D−d L d1 − d2
(a) πr2h (b)
1000
(c)
2
×
l
(d)
2l

2. Pøh\À C¯¢vµzvß £kUøP __________ E÷»õPzvÚõÀ ö\´¯¨£mkÒÍx.
(A) AvP P› öPõsh GLS (B) GLS
(C) Av÷ÁP GLS (D) Áõº¨¤¸®¦
The bed of lathe is made of :
(a) High carbon steel (b) Steel
(c) High speed steel (d) Cast iron

3. {ªº¢u ys ÁøP öPõsh xøÍ°k® C¯¢vµzvøÚ £¯ß£kzv HØ£kzx®
xøÍ°ß Âmh® :
(A) 50 ª.«. Áøµ (B) 10 ª.«. Áøµ
(C) 70 ª.«. Áøµ (D) 12 ª.«. Áøµ
The diameter of the hole size can be drilled in upright drilling machine is :
(a) Upto 50 mm (b) Upto 10 mm
(c) Upto 70 mm (d) Upto 12 mm

4. E¸Áø©US® C¯¢vµzøu ÁiÁø©zuÁº :
(A) ø©U÷PÀ L£õµ÷h (B) öíßÔ ©õmì÷»
(C) ÷á®ì |õìªz (D) G¼ öÁmÛ
The shaping machine was designed by :
(a) Michael Faraday (b) Henry Maudslay
(c) James Nasmith (d) Eli Whitney

3 5981

5. ÷ÁP©õP v¸®£ ö\´²® C¯¢vµ ~m£zvß ‰»® •ßÝ® ¤ßÝ® C¯[S®
£õP® :
(A) ÷\iÀ (B) £o÷©øh (C) SÖUS |Ê (D) vª_
The part involved in reciprocation by quick return is :
(a) Saddle (b) Table (c) Cross rail (d) Ram

6. ÁÀPøÚ_k Aøµ¨¦ \UPµ® ö\´¯ £¯ß£k® ¤i©õÚ ö£õ¸Ò Gx ?
(A) Cµ¨£º (B) Âm›ø£k (C) öµ]Úõ´k (D) ]¼U÷Pm
Which type of Bond is used for making vulcanized grinding wheel ?
(a) Rubber (b) Vitrified (c) Resinoid (d) Silicate

7. ~qUP©õÚ Aøµ¨¦a ö\¯À ‰»® ö£Ó¨£k® ~qUP® :
(A) 0.00125 ª.«. (B) 0.000025 ª.«.
(C) 0.00625 ª.«. (D) 0.0025 ª.«.
The accuracy obtained by precision grinding is :
(a) 0.00125 mm (b) 0.000025 mm
(c) 0.00625 mm (d) 0.0025 mm

8. £o÷©øh |P¸® yµzøu Pmk¨£kzu EuÄ® £õP® :
(A) SÖUS |ÊÂ (B) ÷\iÀ
(C) ö\[Szx Fmh ©øµusk (D) vø\©õØÔ
The distance of table-travel is controlled by :
(a) Cross-slide (b) Saddle
(c) Elevating screw (d) Trip dogs

9. AøÚzvØS® HØÓ ªÀ¼[ C¯¢vµzvÀ £o÷©øhø¯ GzuøÚ ÷Põn® Áøµ
Chx, Á»x £UP©õP _ØÓ •i²® ?
(A) 158 (B) 458 (C) 608 (D) 258
At what angle does the table of Universal Milling Machine is to be swiveled left
and right side ?
(a) 158 (b) 458 (c) 608 (d) 258

5981 4

10. ÷\õ¨¦ ©ØÖ® uõx Gsön´ BQ¯ÁØÔß ‰»® u¯õ›UP¨£k® ö£õ¸Ò
__________.
(A) QŸì (B) µ¨£º (C) v› (D) Gsön´
__________ is manufactured with the ingredients of soap and mineral oils.
(a) Grease (b) Rubber (c) Wick (d) Oil

11. Põº£ß BºU öÁÀi[ Gߣx __________ ÁøPø¯a \õº¢ux.
(A) BºU öÁÀi[ (B) ÷Pì öÁÀi[
(C) \õ¼m ì÷hm öÁÀi[ (D) ªßuøh öÁÀi[
Carbon Arc welding is related to __________.
(a) Arc welding (b) Gas welding
(c) Solid state welding (d) Resistance welding

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

13. P¨£À ©ØÖ® PhÀ \õº¢u xøÓPÎÀ £¯ß£kzu¨£k® £®¦ :
(A) _Ǿ® £®¦
(B) ø©¯ »US £®¦
(C) ]Ó¨¦ ÁøP £®¦
(D) •ßÝ® ¤ßÝ® C¯[S® £®¦
The pump which is used in ship and marine field :
(a) Rotary pump
(b) Centrifugal pump
(c) Special pump
(d) Reciprocating pump

5 5981

14. 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 collective efforts of __________.
(a) Man, machine, materials and tools
(b) Man and machine
(c) Man and tools
(d) Materials and tools

15. ""ø©¯¨£kzu¨£mh Pmk£õmk uõÛ¯[Q •øÓ'' Gߣx __________ BS®.
(A) {ø»¯õÚ uõÛ¯[Q •øÓ
(B) Pmih uõÛ¯[Q •øÓ
(C) £Sv uõÛ¯[Q •øÓ
(D) öuõÈØxøÓ uõÛ¯[Q •øÓ
‘Centralized control automation’ belongs to :
(a) Standard automation system
(b) Building automation system
(c) Partial automation system
(d) Industrial automation system

£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 GßÓõÀ GßÚ ?
What is turning ?

17. _ÇØÔUS _Ǿ® Âø\ uµ¨£k® •øÓPÒ ¯õøÁ ?
What are the methods to drive the spindle of a drilling machine ?

5981 6

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

19. umøh¨£µ¨¦ C¯¢vµzvß ÁøPPÒ |õßQøÚ¨ £ØÔ GÊxP.
Write about the four types of surface grinders.

20. ¤ß £UP £À¼øn°ß £¯ßPÒ ¯õøÁ ?
What are the uses of back gear in a lathe ?

21. ªÀ¼[ GßÓõÀ GßÚ ?
What is milling ?

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

23. ÷Pì öÁÀi[Qß ÁøPPÒ ¯õøÁ ?
State the types of gas welding.

24. ÷Pì öÁÀi[ \õuÚ[PÒ H÷uÝ® BÔøÚ TÖP.
State any six equipments of gas welding.

25. vµÁ¯À – Áøµ¯øÓ u¸P.
Give the definition of “Hydraulics”.

26. C¯¢vµ Pmk¨£õmk A»Qß TÖPÎÀ GøÁ÷¯Ý® ‰ßÔøÚ GÊxP.
Mention any three types of elements in Machine Control Unit.

27. Pmk¨£õmk Ai¨£øh°À C¯[S® uõÛ¯[Q •øÓPÒ ¯õøÁ ?
What are various types of “Based on Control” of automation ?

28. Aø©¨¤ß Ai¨£øh°À Aøµ¨¦ \UPµ® GÆÁõÖ ÁøP¨£kzu¨£kQÓx ?
How are the grinding wheels classified according to construction ?

7 5981

£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. Pøh\À C¯¢vµzvß ÁøPPøÍ Á›ø\¨£kzxP.
List out the types of lathe.

30. xøÍ°k® C¯¢vµzvÀ £¯ß£k® öÁmkÎPÒ GøÁ÷¯Ý® CµsiøÚ £h®
Áøµ¢x ÂÍUSP.
Explain any two types of tools used in drilling machines with diagram.

31. Kº Aøµ¨¦a \UPµzvÀ RÌUPsh SÔ±k ö\´¯¨£mkÒÍx. WA46K5V17
÷©ØPsh Gs ©ØÖ® GÊzxUPÎß ö£õ¸øÍ ÂÍUSP.
A grinding wheel is specified as follows “WA46K5V17”. Explain the meaning of
each symbol.

32. ªÀ¼[ C¯¢vµzvß ]Ó¨¦ ÷\ºUøPPÒ £ØÔ GÊxP.
Write about the special attachments of milling machine.

33. v›¯õÀ E¯ÂhÀ £h® Áøµ¢x ÂÍUSP.
Explain wick lubrication with a neat sketch.

34. BU] A]mi¼ß Pmi[ £h® Áøµ¢x ÂÍUSP.
Explain the Oxy-acetylene cutting with diagram.

35. E¸Áø©US® C¯¢vµzvß AÍøÁ SÔ¨¤k®÷£õx uµ÷Ási¯ SÔ¨¦PÒ
¯õøÁ ?
What are the points to be provided to specify the types of Shaping Machine ?

5981 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) xøÍ°k® C¯¢vµzvÀ £o¨ö£õ¸øͨ ¤iUS® •øÓPÎÀ CµsiøÚ
£hzxhß ÂÍUSP.
(a) Explain the working of a step cone pulley drive mechanism with neat sketch.
OR
(b) Explain any two work holding devices used in a drilling machine with a
neat sketch.

37. (A) Põº£ß BºU öÁÀi[ ö\¯À•øÓø¯ £h® Áøµ¢x ÂÍUSP.
AÀ»x
(B) E¸Áø©US® C¯¢vµzvß vµÁ¯À _ØøÓ¨ £h® Áøµ¢x £õP[PøÍU
SÔ¨¤kP.
(a) Explain carbon arc welding with a diagram.
OR
(b) Draw the circuit of a hydraulic shaping machine and label its parts.

-oOo-