TN 11th Question Paper 2023 Basic Mechanical Engineering

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 8
6781
!6781IstYearBasicMechanicalEngineering! £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_¨£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 ©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

6781 2

1. C¯[QU öPõsi¸US® C¯¢vµzøu öuõh÷Áõ Auß «x \õ´¢x {ØP÷Áõ
Thõx GßÓ £õxPõ¨¦ :
(A) C¯¢vµ £õxPõ¨¦
(B) £o©øÚ £õxPõ¨¦
(C) C¯¢vµ¨ £o¯õͺ £õxPõ¨¦
(D) øPUP¸Â £õxPõ¨¦
The kind of safety rule in which the operator should not touch or rest his body on
the running machine :
(a) Safety precaution for machine tools
(b) Workshop safety precaution
(c) Safety precaution for operators
(d) Safety precaution for hand tool

2. ÷©À£UPz ÷uõØÓ® __________ CÀ öu›²®.
(A) ¦öµõø£À uÍ® (B) ö\[Szx uÍ®
(C) xøn uÍ® (D) Qøh©mh uÍ®
Top view is obtained on __________.
(a) Profile plane (b) Vertical plane
(c) Auxiliary plane (d) Horizontal plane

3. BIS Gߣuß Â›ÁõUP® :

(A) British Institute of Standards
(B) Bharath Industrial Society
(C) Bureau of International Standards
(D) Bureau of Indian Standards
BIS refers to :
(a) British Institute of Standards
(b) Bharath Industrial Society
(c) Bureau of International Standards

(d) Bureau of Indian Standards

3 6781

4. ÷Põn AÍÄPøÍ AÍUPÄ®, Áøµ¯Ä® £¯ß£k® P¸Â :
(A) PÁµõ¯® (B) £[Qk® P¸Â
(C) C[Q[ ö£ß (D) £õøP©õÛ
Angular lines are drawn and measured with :
(a) Compass (b) Divider
(c) Inking pen (d) Protractor

5. ÷PõmiøÚ JÊUPø©Ä ö\´¯¨ £¯ß£k® ö\¯À•øÓ :
(A) ORTHO (B) OSNAP (C) XALIGN (D) RIGHTALIGN
This function helps in aligning the lines by :
(a) ORTHO (b) OSNAP (c) XALIGN (d) RIGHTALIGN

6. Aa]ß AÍøÁ Âh xøÍ°ß AÍÄ AvP©õP EÒÍ Cøn¨¦ :
(A) CøhöÁίØÓ Cøn¨¦ (B) AÊzu Cøn¨¦
(C) |ÊÄ Cøn¨¦ (D) CøhöÁβÒÍ Cøn¨¦
If the size of the hole is larger than the size of the shaft, then the type of fit is
called as :
(a) Transition fit (b) Interference fit
(c) Slip fit (d) Clearance fit

7. Áõº¨£h \õø»°À, ÷uøÁ¯ØÓ ö£õ¸mPøÍ }UQ ©søn _zu¨£kzx® P¸Â :
(A) C¸•øÚ Pµsi (B) ©s öÁmi
(C) \À»øh (D) PõØÓÊzv
The Instrument used to clean the mould sand by removing unwanted materials :
(a) Slick (b) Shovel
(c) Riddle (d) Bellows

8. A›©õÚ Gvº¨¦z ußø© Gߣx :
(A) ªßÛ¯À £s¦ (B) C¯Ø¤¯À £s¦
(C) C¯¢vµÂ¯À £s¦ (D) ÷Áv°¯À £s¦
Corrosion resistance is :
(a) Electrical property (b) Physical property

(c) Mechanical property (d) Chemical property

[ v¸¨¦P / Turn over

6781 4

9. V &ÁiÁ £ÒÍ[PøÍ ÷u´¨£uØS £¯ß£k® Aµ® :
(A) AøµÁmh ÁiÁ Aµ® (B) \xµ ÁiÁ Aµ®
(C) umøh¯õÚ Aµ® (D) •U÷Põn ÁiÁ Aµ®
The file used for filing V-shaped groove is :
(a) Half round file (b) Square file
(c) Flat file (d) Triangular file

10. £À¼ønz öuõh›ß ÷ÁPÂQu® Põq® Áõ´£õk :
T1 N2
(A) T = N (B) D1N1 = D2N2
2 1

NT − N A
(C) RPM (D) × 100
NT
Velocity ratio of a gear drive is :
T1 N2
(a) =
T2 N1 (b) D1N1=D2N2

NT − N A
(c) RPM (d) × 100
NT

11. \›Ä E¸øÍ°ß ÷©Ø£µ¨¤À £ØPÒ öÁmh¨£mi¸US® £À¼øn :
(A) \›Ä¨ £À¼øn
(B) ÷|º¨ £À¼øn
(C) umøh ©ØÖ® Smi¨ £À¼øn
(D) ö|ÎĨ £À¼øn
The teeth elements on the conical surface is :
(a) Bevel gear
(b) Spur gear
(c) Rack and pinion gear
(d) Helical gear

12. ©õÖvø\ ªß\õµzvß Aø»Ä ÷ÁP® :
(A) T¾® (B) 50 _ØÖPÒ/ÂÚõi
(C) «mhº (D) ÷ÁõÀm
The frequency of AC current is :

(a) Coulomb (b) 50 cycles/sec
(c) Meter (d) Volt

5 6781

13. ªß \Uvø¯ C¯¢vµ \Uv¯õP ©õØÖ® \õuÚ® :
(A) xÁUQ (B) öáÚ÷µmhº
(C) ªß©õØÔ (D) ªß ÷©õmhõº
The device used to convert electrical energy into mechanical energy is :
(a) Starter (b) Generator
(c) Transformer (d) Electric Motor

14. EÒÏhØÓ Áõº¨¦ ö\´¯¨ £¯ß£k® ö£õ¸Ò Gx ?
(A) ©õv› Aa_ (B) kÁÀ ¤ß (C) Áõº¨¦ ö£mi (D) EÒÍP®
Which is used for making hollow casting ?
(a) Pattern (b) Dowel pin (c) Moulding box (d) Core

15. __________ •øÓ ‰»® J¸ ö£õ¸øÍ £» vø\Pμ¸¢x £õºUS® ÷£õx
öu›²® £» ÷uõØÓ[Pøͨ ö£Ó»õ®.
(A) öÁmkz ÷uõØÓ® (B) Bºz÷uõQµõ¤U ÷uõØÓ®
(C) BU]»› ÷uõØÓ® (D) I÷\õö©m›U ÷uõØÓ®
Through __________ method, different views of an object in many directions can
be obtained.
(a) Sectional view (b) Orthographic view
(c) Auxiliary view (d) Isometric view

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

16. •uÀ Eu GßÓõÀ GßÚ ?
What is known as First-Aid ?

17. ©õ_£õk – Áøµ¯øÓ ö\´P.
Define Pollution.

18. öÁmkz ÷uõØÓ® GßÓõÀ GßÚ ?

What is a Sectional View ?

[ v¸¨¦P / Turn over

6781 6

19. Áøµ£hzuõÎÀ uø»¨¦U Pmh® Gߣx GßÚ ?
What is a title block in drawing sheet ?

20. Bm÷hõ÷PiÀ ¤ßÁ¸ÁÚÁØÔß ö\¯À£õkPøÍ GÊxP.
(A) ESC \õÂ (B) ~øÇÄ Âø\
Write down the functions of the following in Autocad :
(a) ESC key (b) ENTER key

21. Buõµ AÍÄ GßÓõÀ GßÚ ?
What is ‘Basic size’ ?

22. ©õv› ÁiÁ® u¯õ›UP¨ £¯ß£k® ö£õ¸mPÒ ¯õøÁ ?
What are the materials used to make pattern ?

23. x¸¤iUPõu GLS GßÓõÀ GßÚ ?
What is meant by stainless steel ?

24. ø©U÷µõ«mh›ß Tmk¨¤øÇ GßÓõÀ GßÚ ?
What is positive error of a micrometer ?

25. öÁºÛ¯º Põ¼£º ‰»® xøÍ°ß BÇzøu GÆÁõÖ AÍUP»õ® ?
How do you measure the depth of a hole using vernier caliper ?

26. \õÂPÎß ÁøPPøÍU TÖP.
What are the different types of keys ?

27. ö\¯»ØÓ £À¼ønPÒ GßÓõÀ GßÚ ?
What is an idle gear ?

28. SÔ¨¦ ÁøµP :
(A) öuõhº ªß_ØÖ (B) £UP ªß_ØÖ

Write short notes :
(a) Series circuit (b) Parallel circuit

7 6781

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

29. C¯¢vµ¨ £o¯õ͸UPõÚ £õxPõ¨¦U SÔ¨¦Pøͨ £mi¯¼kP.
List out the safety precautions for an operator.

30. £›©õnªk® •øÓPøÍ £hzxhß ÂÍUSP.
Draw and explain the types of dimensioning.

31. Aa_ ©s u¯õ›UP¨ £¯ß£k® ‰»¨ ö£õ¸mPÒ ¯õøÁ ? H÷uÝ® JßÔøÚ
ÂÍUSP.
What are the raw materials used to make the moulding sand ? Explain any one of
them.

32. Áõåº GßÓõÀ GßÚ ? Auß £¯ßPøÍU TÖP.
Define ‘Washer’ and write its uses.

33. 500 ª.«. 250 ª.«. Âmh•ÒÍ C¸ \UPµ[PÒ ÷|º£møh ‰»® C¯UP¨£kQÓx.
ö£›¯ Âmh•ÒÍ E¸øÍ°ß ÷ÁP® {ªhzvØS Á»g_ȯõP 400 _ØÖPÒ
(RPM) _ØÔÚõÀ ]Ô¯ \UPµzvß ÷ÁP® ©ØÖ® vø\ GßÚ ?

Two pulleys of diameters of 500 mm and 250 mm are connected by means of an
open belt drive. If the larger pulley rotates at a speed of 400 rpm in clockwise
direction, find the speed and direction of rotation of the smaller pulley.

34. ‰ø»©mhU P¸Â°ß £h® Áøµ¢x ÂÍUSP.
Explain the construction of Try square with diagram.

35. Á¸S F] GßÓõÀ GßÚ ? Auß ÁøPPÒ H÷uÝ® ‰ßÔøÚU TÖP.

What is a Scriber ? Mention any three types.

[ v¸¨¦P / Turn over

6781 8

£Sv & IV / PART - IV
SÔ¨¦ : ›ÁõÚ Âøh¯ÎUPÄ®. 2x10=20

Note : Answer the following questions in detail.

36. (A) £_ø© ©nÀ Aa_ ö\´²® •øÓ°øÚ £hzxhß ÂÍUSP.
AÀ»x
(B) ªß\õµ Eø»ø¯¨ £ØÔ öuÎÁõÚ £hzxhß ÂÍUSP.
(a) Explain the method of Green sand moulding with diagram.

OR

(b) Explain the sintering furnace with a neat diagram.

37. (A) ¤ßÁ¸ÁÚÁØøÓ ÂÍUSP.
(i) CshU\ß ÷©õmhõº xÁUQPÒ
(ii) £møh°ß ÁøPPÒ
(iii) øh
(iv) Aa_ ©soß ÁøPPÒ
AÀ»x
(B) Põ¼¨ö£º & ÁøPPøÍU TÔ £hzxhß ÂÍUSP.
(a) Explain the following :

(i) Induction Motor Starters

(ii) Types of belts

(iii) Die

(iv) Classification of moulding sand

OR

(b) Draw and explain the types of Calipers ?

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