TN 11th Question Paper 2022 Basic Mechanical Engineering

No. of Printed Pages : 8
6081
!6081IstYearBasicMechanicalEngineering! £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.

6081 2

1. G¨-£-i¨-£mh C¯¢-vµ £o-¯õÍ-øµ öuõ-ÈØ-\õø» |®-¤-²ÒÍx ?
(A) vÓ-ø©-²ÒÍ £o-¯õͺ (B) Á\-v-²ÒÍ £o-¯õͺ
(C) ¦v-¯ £o-¯õͺ (D) |ßS £izu £o-¯õͺ
What type of Machinist does a Factory depend upon ?
(a) Skilled (b) Rich
(c) New worker (d) Well Educated

2. 'V' Block G¢u ÁiÁ £o¨-ö£õ-¸øÍ ¤iU-P¨ £¯ß-£-k-Q-Óx ?
(A) E¸-øÍ Ái-Á-©õ-Ú (B) \x-µ- Á-i-Á-©õ-Ú
(C) •U-÷Põn Ái-Á-©õ-Ú (D) ö\Æ-Á-P -Á-i-Á-©õ-Ú
What shape of workpieces can be held by a ‘V’ - Block ?
(a) Cylindrical shape (b) Square shape
(c) Triangular shape (d) Rectangular shape

3. ©õØÔ Aø©-U-S® íõU-\õ \m-hz-vÀ ö£õ-x-Áõ-P ¤÷Í-iß }Í® :
(A) 350 mm - 450 mm Áøµ (B) 200 mm - 300 mm Áøµ
(C) 500 mm - 600 mm Áøµ (D) 150 mm - 450 mm Áøµ
Generally the length of blade in an adjustable Hack Saw frame is :
(a) 350 mm - 450 mm (b) 200 mm - 300 mm
(c) 500 mm - 600 mm (d) 150 mm - 450 mm

4. ø\ß-£õº £¯ß-£-kzv £o¨-ö£õ-¸-ÎÀ AÍU-P¨-£-k® AÍÄ :
(A) E¸-øÍ-°ß Âm-h® (B) ©mh £µ¨-¦
(C) xøÍ-°ß BÊ® (D) ÷Põ-n®
What kind of measurement is read using sine bar ?
(a) Diameter of cylinder (b) Flat surface
(c) Depth of hole (d) Angle

5. ]¼¨ ÷Pä ö\´¯¨ £¯ß-£-k® E÷»õ-P® __________.
(A) A¾-ª-Û-¯® (B) ø©Àk ìjÀ
(C) Áõº¨¦ C¸®-¦ (D) Av-÷ÁP GL-S
Slip gauge is made up of __________.
(a) Aluminium (b) Mild steel

(c) Cast iron (d) High speed steel

3 6081

6. ]u-Ö® ußø© öPõsh ö£õ-¸Ò :
(A) Áõº¨-¤-¸®¦ (B) GL-S (C) A¾-ª-Û-¯® (D) -ö\®¦
Which material has brittleness property ?
(a) Cast iron (b) Steel (c) Aluminium (d) Copper

7. __________ Gß-£x ¦ÓU-P-i-Ú-©õU-S-uÀ •øÓ BS®.
(A) \¯-øÚ-i[ (B) £u¨-£-kz-uÀ
(C) Pi-Ú¨-£-kz-x-uÀ (D) ª¸-x-ÁõU-S-uÀ
__________ is a method of case hardening.
(a) Cyaniding (b) Tempering
(c) Hardening (d) Annealing

8. _s-nõ®-¦U-PÀ Gß-£x __________.
(A) ö©Ê-S (B) ¤Íõì-iU (C) E÷»õ-P® (D) ¤Íõì-hº
The gypsum cement is known as __________.
(a) Wax (b) Plastic (c) Metal (d) Plaster

9. £o¨-ö£õ-¸øÍ ¤iz-x öÁm-k-Îø¯ ÁÈ-|-hz-x® \õ-u-Ú® :
(A) 'V' ¤ÍõU (B) L¤U-\º
(C) B[-QÀ ¤÷Ím (D) âU
The device which holds the workpieces and guides the tool is called :
(a) ‘V’ - block (b) Fixture
(c) Angle Plate (d) Jig

10. Buõµ AÍ-ÂØ-S®&C¸U-S® AÍ-ÂØ-S® EÒÍ ÷ÁÖ-£õk :
(A) §ä-¯U- ÷Põk (B) AÍ-Âß GÀ-ø»
(C) xøÍ (D) ©õ-Ö-£õk
The difference between the actual size and the basic size is called :
(a) Zero line (b) Limits of size
(c) hole (d) Deviation

6081 4

11. £À-¼øn •øÓ-°À ÷ÁP ÂQ-u® Gß-£x :
D-d πDn D1 (100 - S) N2 T1
(A) (B) (C) × (D) =
2L 1000 D2 100 N1 T2

The velocity ratio of a gear drive is :

D-d πDn D1 (100 - S) N2 T1
(a) (b) (c) × (d) =
2L 1000 D2 100 N1 T2

12. E.M.F. Gß-£-uß Â›-ÁõU-P® :
(A) Electro Motive Force (B) Electric Mechanical Force
(C) Electric Metallic Force (D) Electro Magnetic Force
The expansion of the EMF :
(a) Electro Motive Force (b) Electric Mechanical Force
(c) Electric Metallic Force (d) Electro Magnetic Force

13. ""AÔ¯À ÷©»õsø©°¯¼ß u¢øu'' GÚ AøÇUP¨£k£Áº :
(A) F.W. öh´»º (B) öíßÔ L÷£¯õÀ
(C) L£õµ÷h (D) ¤¯º öÁºÛ¯º
The Father of ‘Scientific Management’ is :
(a) F.W. Taylor (b) Henry Fayol
(c) Faraday (d) Pierre Vernier

14. uÁÓõÚ TØÖ/TØÖPøÍz ÷uº¢-öu-kU-P-Ä®.
ìS-›À-÷Pä Cß-hU-åß ÷©õm-hõº.
(i) Aø©¨¦ GÎ-ø©-¯õ-Úx (ii) Âø» Av-P®

(iii) £µõ-©-›¨-£x Pi-Ú® (iv) SøÓ-ÁõÚ xÁUP v¸¨-¦-Âø\ öPõs-h-x
(A) (i) ©Ø-Ö® (iv) ©mk® (B) (i) ©Ø-Ö® (ii) ©m-k®
(C) (ii) ©ØÖ® (iii) ©m-k® (D) (iii) ©m-k®
Select the incorrect statement/statements.
Squirrel Cage Induction Motor.
(i) Simple in construction (ii) High cost
(iii) Maintenance is troublesome (iv) Less starting torque
(a) (i) and (iv) only (b) (i) and (ii) only
(c) (ii) and (iii) only (d) (iii) only

5 6081

15. £o- © - ø Ú- ° À BU- \ õ- ¤ - ÷ Í- h õÀ öÁm- k - u À, ÷u´z- u À ©Ø- Ö ® ö£õ- ¸ z- x ®
÷Áø»-PÒ ö\´-uÀ :
(A) £o-¯õͺ Fv-¯® (B) Pa-\õ ö£õ-¸m-P-Îß ö\»-Ä
(C) {º-Áõ-Pa ö\»-Ä (D) Á›a ö\»Ä
Charges for hack saw cutting, filing, fitting and assembling in workshop are
counted under the head :
(a) Workers wages (b) Cost of raw material
(c) Administrative expenditure (d) Tax

£Sv & II / PART - II
SÔ¨¦ : HøuÝ® £z-x ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 28 &US Pmhõ¯®
Âøh¯ÎUP ÷Ás-k®. 10x3=30
Note : Answer any ten questions. Question No. 28 is compulsory.

16. £õ-x-Põ¨¦ Gß-ÓõÀ GßÚ ? Auß ÁøP-PøÍ GÊ-x-P.
What is Safety ? Mention its types.

17. £[-Q-k® P¸- (Divider) &°ß £¯ß-PÒ ¯õøÁ ?
What are the uses of Divider ?

18. AÍ-Â-P-Îß |ß-ø©-PÒ ¯õøÁ ?
What are the advantages of Gauges ?

19. ö£õ-¸-Îß EÖ-vz-ußø© ©Ø-Ö® Pi-Úz-uß-ø©ø¯ Áøµ-¯-ÖU-P-Ä®.
Define Toughness and Hardness of a material.

20. |õº-©-ø»-][ ö\´-Á-uß ÷|õU-P[-PÒ ¯õøÁ ?
What are the purposes of normalizing ?

21. ©õ-v› Ái-Á® ö\´-¯¨ £¯ß-£-k® ö£õ-¸m-PøÍ GÆ-ÁõÖ ÷uº¢-öu-kU-P-»õ® ?

How do you select the material used for making ‘Pattern’ ?

6081 6

22. RÌU-Psh ©øµ-Pøͨ £ØÔ ]ÖSÔ¨¦ Áøµ-P.
(A) BSW ©øµ -(B) ö©m-›U ©øµ (C) -AUª ©øµ
Mention a brief note on the following Threads.
(a) BSW Thread (b) Metric Thread (c) Acme Thread

23. âU Gß-ÓõÀ GßÚ ? Auß £õ-P[-PøÍ GÊ-x-P.
What is a JIG and mention its parts ?

24. Cøn¨-¤ß (Fits) ‰ßÖ ÁøP-PÒ ¯õøÁ ? AÁØ-ÖÒ H÷u-Ý® Jß-øÓ¨ £ØÔ
GÊ-x-P.
What are the three types of fits ? Explain any one of them.

25. umøh ©Ø-Ö® ]Ö £À-¼øn Gß-ÓõÀ GßÚ ?
What is a Rack and Pinion Gear ?

26. £o-¯õͺ-P-Îß Fv-¯® Gß-ÓõÀ GßÚ ?
What is worker’s wages ?

27. £o B´Ä – Áøµ-¯-ÖU-P-Ä®.
Define “work study”.

28. A.C. 3φ &Cß-hU-åß ÷©õm-hõº ö\¯À-£-k® uz-x-Áz-vøÚ GÊ-x-P.
Write the principle of working of AC three phase Induction Motor.

£Sv & III / PART - III
SÔ¨¦ : H÷u-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.

29. C¯¢-vµ £o-¯õÍ-›ß Ph-ø©-PÒ ¯õøÁ ?
Describe the duties of Machinist.

30. B[-QÒ ¤÷Ím (Angle Plate) £h® Áøµ¢x ÂÍU-S-P.
Describe Angle Plate with a neat sketch.

7 6081

31. öÁºÛ-¯º Põ-¼-£-¸U-S®, ø©U-÷µõ-«m-h-¸U-S® EÒÍ ÷ÁÖ-£õ-k-PøÍ GÊ-x-P.
Write the differences between Vernier Caliper and Micrometer.

32. ö£õ-¸m-P-Îß ÷Áv-°-¯À ©Ø-Ö® ªß-Û-¯À £s-¦-PÒ (Chemical and Electrical
Properties) £ØÔ ÂÁ-›U-P-Ä®.
Describe chemical and electrical properties of materials.

33. u꼀 xsk ©õ-v› Ái-Á® (Loose Piece Pattern) £h® Áøµ¢x ÂÁ-›U-P-Ä®.
Draw a neat sketch of loose piece pattern and explain it.

34. ""÷\iÀ \õÂ'' £ØÔ SÔ¨¦ ÁøµP. Auß ÁøP-PøÍ ÂÍU-S-P.
Define “Saddle key”. Explain its types.

35. ÂÍU-SP :
(i) Aa_ (Shaft)
(ii) C¸-•P ÷ÁÖ-£õk •øÓ

(iii) æ›[ L¤m (Shrink Fit)
Describe :
(i) Shaft
(ii) Bilateral Tolerance
(iii) Shrink fit

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

36. (A) ÷£›[ ¦À-»-›ß Aø©¨ø£ £hz-x-hß ÂÍU-S-P.
AÀ»x
(B) "]|õ¨ ÷Pâß' £h® Áøµ¢x AÁØ-Ôß ÁøP-PøÍ ÂÁ›U-P-Ä®.
(a) Draw and explain a Bearing Puller.
OR
(b) Draw the Snap Gauge and explain its types.

6081 8

37. (A) RÌU-Ps-h-ÁØøÓ ÂÍU-SP.
(i) ª¸-x-ÁõU-S-uÀ (Annealing) ©Ø-Ö®
(ii) Pi-Ú¨-£-kz-x-uÀ (Hardening)
AÀ»x
(B) (i) Tm- k ¨ £À- ¼ - ø nz öuõ- h º (Compound Gear Train) Jß- Ô ß £h®
Áøµ¢x ÂÍU-S-P.
(ii) 48 £Ø- P Ò öPõsh £À- ¼ øn Chg- _ - È - ¯ õP 600 rpm ÷ÁPz- v À
_Ç-¾® ÷£õx, Au-Ý-hß Cøn-²® 72 £Ø-PÒ öPõsh £À-¼øn G¢u
vø\-°À G¢u ÷ÁPz-vÀ _Ç-¾® ?
(a) Describe the following :
(i) Annealing
(ii) Hardening
OR
(b) (i) Explain compound Gear train with a neat sketch.
(ii) If a gear having 48 teeth rotates at a speed of 600 rpm in anti
clock-wise direction, what will be the speed and direction of rotation of
a gear having 72 teeth which is in mesh with the first one ?

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