Engineering Drawing Tutorial Solution I

SOLUTION FOR TUTORIAL NO. 3 (DESCRIPTIVE GEOMETRY I)

 


T 3.1) Draw the projections of the following points. (a) Point A, 25 mm infront of VP and 30 mm above HP. (b) Point B, 32 mm infront of VP and in the HP. (c) Point C, 22 mm behind VP and 28 mm above HP. (d) Point D, 35 mm behind VP and in the HP. (e) Point E, 28 mm behind VP and 30 mm below HP. (f) Point F, in the VP and 40 mm below HP. (g) Point G, 20 mm infront of VP and 25 mm below HP. (h) Point H, in the VP and HP.

 

T 3.2) Draw the projections of the following lines: (a) Line AB, 45 mm long, parallel to HP and VP both, when its distance from HP and VP is 25 mm and 30 mm respectively. (b) Line CD, 45 mm long, perpendicular to HP and 20 mm away from VP, when one of its extremities nearer to HP is 10 mm away from the HP. (c) Line EF, 45 mm long, contained by HP, and perpendicular to VP, when one of its extremities is 10 mm away from the VP. (d) Line GH, 50 mm long, parallel to VP and inclined to HP at 30 degree , when one of its ends is 15 mm from HP and 20 mm from the VP. (e) Line IJ, 50 mm long, contained by HP and inclined to VP at 45 degree , when one of its ends is 15 mm from the VP. (f) Line KL, 40 mm long contained by both the HP and the VP

 

T 3.3) Draw the projections of the line MN when its end M is 10 mm from HP and 15 mm from VP and end N is 30 mm from HP and 40 mm from VP. Its end projectors are 40 mm apart.

T 3.4) The front view of a line, inclined at 30 degree to the VP is 65 mm long. Draw the projections of the line, when it is parallel to and 40 mm above the HP, its one end being 30 mm in front of the VP.

T 3.5) A 90 mm long line is parallel to and 25 mm in front of the VP. Its one end is in the HP while the other is 50 mm above the HP. Draw its projections and find its inclination with the HP.

 

T 3.6) A square lamina ABCD, of 25 mm side is parallel to HP and is 10 mm from it. Its side nearer to VP is parallel to and 10 mm from VP. Draw its projections.

T 3.7) A rectangle ABCD 60 mm × 40 mm is parallel to HP with one of its sides inclined at 30 degree to VP and the end of the side near to VP is 15 mm in front of the VP and 30 mm above the HP. Draw its projections.

T 3.8) A regular pentagon ABCDE 20 mm side has its corner A in HP and the side CD parallel to the HP. Draw its projections when its plane is parallel to and 10 mm from the VP.

 

T 3.9) A square lamina ABCD of 30 mm side is perpendicular to VP and inclined to HP at 45 degree . It rests on its side BC in HP. Draw its projections when corner point C is 12 mm infront of the VP.

T 3.10) A regular pentagon ABCDE, of 25 mm side, has its side BC in HP. Its plane is perpendicular to the HP and inclined at 45 degree to the VP. Draw the projections of the pentagon when its corner nearest to VP is 10 mm from it.

 

T 3.11) Draw the projections of a thin circular sheet of 50 mm diameter and negligible thickness, when its plane is inclined at 45 degree to VP and is perpendicular to HP. A point on it circumference and nearest to the VP is 40 mm away from the HP and 14 mm from the VP.