Tamil and English General Mechanist

1401 (NP)

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Part III — Vocational Subjects

( Engineering and Technology Area )

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Time Allowed : 2.30 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.

!1401NPGenMachinist!

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AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®.

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.

Register Number

£vÄ Gs

1.

hµm ©ØÖ® ÷P¨ìhß ÷»z G¢u ÁøPø¯a \õº¢ux ? (A) ÷©øh°À Aø©¢u Pøh\À C¯¢vµ®

(B) lÀ ¹® Pøh\À C¯¢vµ®

(C) uõÛ¯[Q Pøh\À C¯¢vµ®

(D) £Sv uõÛ¯[Q Pøh\À C¯¢vµ®

Turret and Capstan lathes are classified under : (a) bench lathe

(b) tool room lathe (c) automatic lathes (d) semi-automatic lathes

2.

£õ¼æ[ ÷»z G¢u ÁøPø¯a \õº¢ux ?

(A) Av÷ÁP Pøh\À C¯¢vµ® (B) uõÛ¯[Q Pøh\À C¯¢vµ®

(C) Gßâß ÷»z (D) lÀ ¹® ÷»z

Polishing lathe is a type of :

(a) high speed lathe (b) automatic lathe

(c) engine lathe (d) tool room lathe

3.

Pmk©õÚ £oPÒ |øhö£Ö® Ch[PÎÀ £¯ß£k® xøÍ°k® C¯¢vµ® : (A) Tmkz xøÍ°k® C¯¢vµ®

(B) £»_ÇØÔ xøÍ°k® C¯¢vµ®

(C) ÷©øh°À Aø©¢u xøÍ°k® C¯¢vµ®

(D) øP°÷»¢v xøÍ°k® C¯¢vµ®

The drilling machine used in constructional work is : (a) gang drilling machine

(b) multiple spindle drilling machine (c) bench drilling machine

(d) portable drilling machine

4.

xøÍ°k® A»Qß Ai•øÚU ÷Põn® :

(A)

•uÀ

(B)

(C)

(D)

(a) 128 to 158 (b) 1808 (c) 598 (d) 1188

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E¸Áø©US® C¯¢vµzvÀ ö\´¯¨£k® •UQ¯ ÷Áø» :

(A) umøh¨£µ¨ø£ CøÇzuÀ (B) ©øµ öÁmkuÀ

(C) Pøh\À (D) xøÍ°kuÀ

The operation mainly done on a shaping machine is :

(a) machining a flat surface (b) thread cutting

(c) turning (d) drilling

6.

÷ÁP©õPz v¸®£a ö\´²® C¯¢vµ ~m£zvß ‰»® •ßÝ® ¤ßÝ®

|P¸® £õP® :

(A) ys£õP® (B) SÖUS |ÊÂ

(C) £o÷©øh (D) vª_

The part involved in reciprocation by quick return is :

(a) column (b) cross rail

(c) table (d) ram

7.

£À»õ°µUPnUPõÚ öÁmk •øÚPøÍU öPõsh öÁmkÎ : (A) Aøµ¨¦a \UPµ® (B) ªÀ¼[ öÁmkÎ (C) Pøh\À öÁmkÎ (D) xøÍ°k® A»S

The cutting tool with several thousands of cutting edges is :

(a) grinding wheel (b) milling cutter

(c) lathe cutting tool (d) drill

8.

E»º Aøµ¨¦a ö\¯¼ß ÷£õx HØ£k® öÁ¨£zvß AÍÄ :

(A)

(B)

(C)

(D)

The heat generated during dry grinding will be :

(a) 10008C (b) 12008C (c) 20008C (d) 208C

9.

ªÀ¼[ C¯¢vµzvÀ öÁmkU P¸ÂPÒ ö£õ¸zu¨£k® £õP® : (A) Ea]UøP (B) _ÇÀ usk

(C) ys£õP® (D) ÷\iÀ

In a milling machine cutters are mounted on :

(a) over hanging arm (b) arbor

(c) column (d) saddle

10.

ªÀ¼[ C¯¢vµzvÀ öÁmk® BÇzvß A»S : (A) ª.«/_ØÖ (B) ª.«/Aø\Ä

(C) ª.« (D) «/{ªh®

The unit of depth of cut in a milling machine :

(a) mm/revolution (b) mm/stroke

(c) mm (d) m/min

11.

C®ö£À»º G¢u £®¤À EÒÍx ?

(A) ø©¯Â»US £®¦ (B) ÷Áß £®¦

(C) •ßÝ® ¤ßÝ® |P¸® £®¦ (D) Q¯º £®¦

Impeller is a part found in a :

(a) centrifugal pump (b) vane pump

(c) reciprocating pump (d) gear pump

12. 5

•uÀ

Áøµ²ÒÍ ªß÷©õmhõºPÐUS HØÓ xÁUQ : (A) Bm÷hõ iµõßìL£õº©º xÁUQ

(B) ÷µõmhõº öµ]ìhßm xÁUQ (C) ìhõº&öhÀhõ xÁUQ

(D) øhµUm Bß ø»ß xÁUQ

Starter used for motors of capacity 5 hp to 15 hp is : (a) auto-transformer starter

(b) rotor resistance starter (c) star delta starter (d) direct-on-line starter

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¤ÍõìiU {ø» öÁÀi[&ß ÷ÁÖ ö£¯º GßÚ ?

(A) ÷Pì öÁÀi[ (B) AÊzu öÁÀi[

(C) ì£õm öÁÀi[ (D) £m öÁÀi[

Which is otherwise known as plastic welding ?

(a) gas welding (b) pressure welding

(c) spot welding (d) butt welding

14.

÷|µi Gsq¸U Pmk¨£õmk Aø©¨¦US

÷uøÁ.

(A) PoÛ Pmhø©¨¦ (B) «ÒuµÄ Aø©¨¦

(C) ÷|µi ÷©Ø£õºøÁ¯õͺ (D) uP÷Áئ Aø©¨¦

Direct Numerical Control needs __________.

(a) network system (b) feedback system

(c) on-site supervisors (d) adaptive control

15.

u¯õ›¨¦¨ £o

BÀ \õzv¯©õQÓx.

(A) ©Ûuß, C¯¢vµ®, ‰»¨ö£õ¸Ò ©ØÖ® öÁmkÎ (B) ©Ûuß ©ØÖ® öÁmkÎPÒ

(C) ©Ûuß ©ØÖ® C¯¢vµ®

(D) ‰»¨ö£õ¸Ò ©ØÖ® öÁmkÎPÒ

Production is achieved by :

(a) men, machine, materials and tools (b) men and tools

(c) man and machine (d) materials and tools

10x3=30

£Sv &

GøÁ÷¯Ý® £zx ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs

&US Psi¨£õP Âøh¯ÎUPÄ®.

Answer any ten questions. Question no. 28 is compulsory.

16. V

ÁiÁ £kUøP°ß AÝT»[PÒ ¯õøÁ ?

What are the advantages of a V-bed ?

17.

Pøh\À C¯¢vµzvÀ ö\´¯¨£k® ÷Áø»PÒ H÷uÝ® ‰ßÔøÚU TÖP.

Mention any three operations performed in a lathe.

18.

xøÍ°k® C¯¢vµzvÀ "öÁmk® ÷ÁP®' & Áøµ¯Ö.

Define ‘cutting speed’ in a drilling machine.

19.

ö\¯»ØÖ ÷£õÚ ¤ß ÷©ØöPõÒЮ £µõ©›¨¦ GßÓõÀ GßÚ ?

What is breakdown maintenance ?

20.

E¸Áø©US® C¯¢vµzvÀ _ÇÀ ÁøP öÁmkÎz uø»°ß £¯ß ¯õx ?

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

21.

umøh¨ £µ¨¦ Aøµ¨¦ C¯¢vµzvß ÁøPPÒ ¯õøÁ ?

What are the types of surface grinding machines ?

22.

ªÀ¼[ C¯¢vµzvß AÍÄ GÆÁõÖ SÔ¨¤h¨£kQÓx ?

How is the size of a milling machine specified ?

23.

SÔ±k uø»°ß ÁøPPÒ ¯õøÁ ?

What are the types of indexing head ?

24.

vµÁ¯À GßÓõÀ GßÚ ?

What is hydraulics ?

25.

ªß ÷©õmhõ›À xÁUQ°ß ÷uøÁ ¯õx ?

What is the need of a starter in a electrical motor ?

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÷Pì- öÁÀi[&À HØ£kzu¨£k® wa_h›ß ‰ßÖ ÁøPPÒ ¯õøÁ ?

Name the three types of flames generated in gas welding.

27.

C¯UPU Pmk¨£õmk Aø©¨¦ GßÓõÀ GßÚ ?

What is motion control system ?

28.

xøÍ°k® C¯¢vµzvÀ _ÇØÔUS _ÇÀ Âø\ uµ¨£k® •øÓPÒ ¯õøÁ ?

What are the methods by which the spindle drive is obtained in drilling machine ?

£Sv &

GøÁ÷¯Ý® I¢x ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs

&US Psi¨£õP Âøh¯ÎUPÄ®.

Answer any five questions. Question no. 35 is compulsory.

29.

Pøh\À ö£õÔ°ß HØÔa ö\À¾® £Sv°ß £h® Áøµ¢x £õP[PøÍ SÔUPÄ®.

Draw a neat sketch of carriage of a lathe and label its parts.

30.

xøÍ°k® C¯¢vµzvß ÁøPPøͨ £mi¯¼kP.

List out the types of drilling machines.

31.

E¸Áø©US® C¯¢vµzvß vµÁ¯À _ØÔß £h® Áøµ¢x £õP[PøÍU SÔUPÄ®.

Draw the circuit of a hydraulic shaper and label its parts.

32. D.O.L.

xÁUQ°ß £h® Áøµ¢x ÂÍUSP.

Draw and explain a D.O.L. starter.

33.

ÁÇUP £µõ©›¨¤øÚ¨ £ØÔ ÂÁ›.

Explain ‘Routine Maintenance’.

34.

Gß.]. Aø©¨¤ß Áͺa]PøÍ ÂÁ›.

Briefly explain the advancements in NC machines.

35.

BºU öÁÀi[QØS®, ÷Pì öÁÀi[QØS® EÒÍ ÷ÁÖ£õkPÒ ¯õøÁ ?

What are the differences between arc welding and gas welding ?

5x5=25

£Sv &

AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®.

Answer all the questions.

36.

(A) Pøh\À C¯¢vµzvß AkUSU T®¦ P¨¤ Aø©¨¤ß £h® Áøµ¢x ÂÁ›.

AÀ»x

(B) E¸Áø©US® C¯¢vµzvß £h® Áøµ¢x ÂÁ›.

(a) Draw and explain stepped cone pulley drive of a lathe.

OR

(b) Draw a neat diagram of a shaping machine and explain.

37.

(A) ªÀ¼[ C¯¢vµzvÀ ö\´¯¨£k® ÷Áø»Pøͨ £mi¯¼kP. H÷uÝ®

CµsiøÚ¨ £h[PÐhß ÂÁ›.

AÀ»x

(B) öÁmkÎ ©ØÖ® öÁmkUP¸Â Aøµ¨¦ C¯¢vµzvß £h® Áøµ¢x ÂÁ›.

(a) List out the milling machine operations. Explain any two with diagrams.

OR

(b) Draw and explain tool and cutter grinding machine.

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