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ANNA UNIVERSITY : CHENNAI – 600 025

B.E./B.Tech. DEGREE EXAMINATIONS. Apr./May.-2013

Regulations – 2008

Fourth Semester

B.E. Mechanical Engineering/

ME2257 COMPUTER AIDED MACHINE DRAWING LABORATORY

Time: 3 Hours Maximum Marks: 100

Mark Allotment Pattern

Aim/Procedure/System

requirements

Theory and

Sketches

Part – A

2D CAD Model

or

Manual Drawing

(Any One)

Part – B

Viva Total

15 25 50 10 100

Note: Select any one question from Part – A and one question from Part – B

Part – A (Marks: 25)

1.  With a neat sketch mark the basic terms of a welded joint for butt weld andfillet weld.

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2.  For the following designation draw the illustration and symbol for welding joints.

a.  Square butt weld b.

 Single – V butt weld

c.  Single – bevel butt weldd.  Fillet welde.  Spot weldf.  Seam weld

3.  With a neat sketch mark the dimensions of the edge preparation for the buttwelds.

4.  Draw the standard location of elements of a welding symbol.

5.  With a neat sketch explain caulking and fullering in riveted joint.

6.  With neat sketches name the types of rivet head.

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7.  Define the terms associated with riveted jointsa.  Pitch

 b.  Marginc.

 Chain riveting

d.  Zig-zag rivetinge.  Row pitchf.  Diagonal pitch

8.  (a) Name the commonly used materials for rivets.(b) How riveted joints made air tight?

9.  (a) What is a structural joint in rivets?(b) How boiler joint are classified?

10. Sketch any two types of structural riveted joints, indicating proportionatedimensions.

11. Draw the sectional front view for the following riveted joints to join plates ofthickness 10 mm.

a.  Single riveted lap joint b.  Double riveted chain lap jointc.  Double riveted zig-zap lap joint

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12. Through sketches, indicate the various types of welding joints.

13. Sketch and explain the two conventional signs used for welding as per BIS.

14. (a) Categorize the welding symbols.(b) How weld symbols shown in the drawing?

15. (a) Explain the meaning of “arrowside” and “otherside” with reference to weld joints.

(b) What are the important rules to be observed while applying weld symbols?

16. (a) What is a key and what for is it applied?(b) What is the difference between a saddle key and a sunk key?

17. What is a cotter and where is it used? What is the purpose of using a gib alonewith a cotter in a cotter joint?

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23. How are the following threads designated as per BIS.(a) Metric thread with coarse pitch

(b) Metric thread with fine pitch(c) Square thread

(d) ACME thread

24. (a) What is T-Bolt and where is it used?(b) What is an eye-Bolt and what purpose is it used?

25. Sketch the following thread profiles for a nominal diameter of 25 mm and pitch 3 mm and give their applications

(a) BSW thread

(b) Buttress thread

26. Sketch the following thread profiles for a nominal diameter of 25 mm and pitch 3 mm and give their applications

(a) Square thread

(b) ACME thread

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27. Sketch the conventional representation of the following(a) External thread

(b) Internal thread

(c) Thread in section(d) Assembled threads in section

28. Sketch any two types of bolts with their applications.

29. Sketch the following forms of nut, with proportions marked(a) Flanged nut

(b) Cap nut

(c) Dome nut

(d) Capstan nut

30. Define the terms :(a) Basic size

(b) Limits

(c) Allowance

(d) Tolerance

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31. (a) What is unilateral tolerance?(b) What is bilateral tolerance?

32. What is fundamental tolerance and how tolerance is denoted?

33. What is meant by the term fit and how are fits classified?

34. Differentiate between clearance fit and transition fit.

35. Differentiate hole basis system and shaft basis system?

36. With the help of sketches, show how the geometrical tolerances are indicated,as prevalent in industry, for the following cases:

(a) Parallelism

(b) Perpendicularity

(c) Symmetry

(d) Radial run out

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Note: Select any one question from Part – A and one question from Part – B

Part – B (Marks: 30)

1.  Manually sketch the butt-muff coupling as shown in Figure 1(b) and half-lapmuff coupling as shown in Figure 2 (b).(Take D = 30 mm, W = 5 & T = 3 mm) (25 + 25)

Figure 1

Figure 2

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2.  Manually sketch the split muff coupling as shown in Figure 3 (b) and flangedcoupling as shown in Figure 4 (b).

(Take D = 30 mm, W = 5 & T = 3 mm) (25 + 25)

Figure 3

Figure 4

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3.  Manually sketch the protected type flange coupling as shown in Figure 5 andsolid flanged coupling as shown in Figure 6.

(Take D = 30 mm, W = 5 & T = 3 mm)

Figure 5

Figure 6

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4.  Manually sketch the universal coupling as shown in Figure 7 (b).(Take D = 30 mm, W = 5 & T = 3 mm)

Figure 7

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5.  Manually sketch the Plummer block as shown in Figure 8.

Figure 8

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6.  Manually sketch the screw jack as shown in Figure 9. 

Figure 9

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7.  Manually sketch the screw jack as shown in Figure 10. (Body, Barrel &Spindle) 

Figure 10

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8.  Manually sketch the Plummer block as shown in Figure 11. 

Figure 11

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9.  Manually sketch the screw jack as shown in Figure 12.

Figure 12

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10. Manually sketch the universal joint as shown in Figure 13.(Take D = 30 mm, W = 5 & T = 3 mm) 

Figure 13

11. Manually sketch the machine vice as shown in Figure 14.

Figure 14

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12. Manually sketch the stuffing box as shown in Figure 15. 

Figure 15

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13. Manually sketch the safety valve as shown in Figure 16. 

Figure 16

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14. Manually sketch the non-return valve as shown in Figure 17. 

Figure 17

15. Manually sketch the connecting rod as shown in Figure 18. 

Figure 18

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16. Using CAD software sketch the butt-muff coupling as shown in Figure 19(b)and half-lap muff coupling as shown in Figure 20 (b).

(Take D = 30 mm, W = 5 & T = 3 mm) (25 + 25)

Figure 19

Figure 20

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17. Using CAD software sketch the split muff coupling as shown in Figure 21 (b)and flanged coupling as shown in Figure 22 (b).

(Take D = 30 mm, W = 5 & T = 3 mm) (25 + 25)

Figure 21

Figure 22

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18. Using CAD software sketch the protected type flange coupling as shown inFigure 23 and solid flanged coupling as shown in Figure 24.

(Take D = 30 mm, W = 5 & T = 3 mm)

Figure 23

Figure 24

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19. Using CAD software sketch the universal coupling as shown in Figure 25 (b).(Take D = 30 mm, W = 5 & T = 3 mm)

Figure 25

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20. Using CAD software sketch the Plummer block as shown in Figure 26.

Figure 26

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21. Using CAD software sketch the screw jack as shown in Figure 27. 

Figure 27

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22. Using CAD software sketch the screw jack as shown in Figure 27. (Body,Barrel & Spindle) 

Figure 28

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23. Using CAD software sketch the Plummer block as shown in Figure 29. 

Figure 29

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24. Using CAD software sketch the screw jack as shown in Figure 30.

Figure 30

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25. Using CAD software sketch the universal joint as shown in Figure 31.(Take D = 30 mm, W = 5 & T = 3 mm) 

Figure 31

26. Using CAD software sketch the machine vice as shown in Figure 32.

Figure 32

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27. Using CAD software sketch the stuffing box as shown in Figure 33. 

Figure 33

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28. Using CAD software sketch the safety valve as shown in Figure 34. 

Figure 34

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29. Using CAD software sketch the non-return valve as shown in Figure 35. 

Figure 35

30. Using CAD software sketch the connecting rod as shown in Figure 36. 

Figure 36