CBSE Question Paper 2007 Class 12 Engineering Graphics

General Instruction:

• Attempt all the questions.
• Use both sides of the drawing sheet, if necessary.
• All dimensions are in millimeters.
• Missing and mismatching dimensions, if any, may be suitably assumed.
• Follow the SP: 46-1988 codes.
• (with First Angle method of projection)

1. (a) Construct an isometric scale. [4] (b) Construct an isometric projection of a frustum of a hexagonal pyramid,
   base side = 30 mm, top side = 25 mm and axis height = 50 mm. When
   resting on H.P. on its base, one of the base sides is parallel to V.P. and the
   axis is perpendicular to H.P. Give all dimensions. [9] (c) A pentagonal prism with the side of the pentagonal base = 40 mm and height
   of axis = 30 mm, is resting on H.P. on its base, with one of its sides
   normal to V.P. On the top pentagonal-end, a cylinder of 50 mm diameter
   base and height 70 mm, is centrally placed with its circular base on it.
   Taking their common axis perpendicular to H.P. draw the isometric
   projection of the solids. Give all dimensions.

2. (a) Draw to scale 1:1, the plan and front view of a hexagonal nut, taking its nominal diameter as 25 mm, keeping its axis perpendicular to H.P. and two opposite sides of the hexagon parallel to V.P. Give standard dimensions. [9]

OR

Draw to scale 1:1, the standard profiles of a square thread and a knuckle thread, taking the pitch as 40 mm for each. Give standard dimensions.
(b) Sketch freehand the front view and top view of a collar stud, keeping the
axis perpendicular to H.P. Take nominal diameter as 20 mm. Give standard
dimensions. [6]

OR

Keeping the axis vertical, sketch freehand the front view and plan of a pan-head rivet without the tapered neck. Take diameter as 20 mm. Give standard dimensions.

3. Figure 1 shows the parts of a knuckle joint. Assemble these parts correctly and then draw the front view, full in section, to a scale full size. 2 5 Print title and scale used. Give six important dimensions.

OR

Figure 2 shows the parts of an unprotected flange coupling (having a socket and spigot arrangement). Assemble these parts correctly and then draw the following views to a scale full size:
(a) Front view, upper half in section [15] (b) Side view, as seen from right. [10] Print title and scale used. Draw the projection symbol. Give six important dimensions.

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Last Year Question Paper Class 12 Engineering Graphics 2007

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