CBSE Question Paper 2017 Class 12 Engineering Graphics

General Instructions:

1. Attempt all the questions.
2. Use both sides of the drawing sheet, if necessary.
3. All dimensions are in millimeters.
4. Missing and mismatching dimensions, if any, may be suitably assumed.
5. Follow the SP: 46-2003 revised codes (with first angle method of projection).
6. In no view of question 2, hidden edges or lines are required.
7. In question 4, hidden edges or lines are to be shown in views without section.
8. Give your answers according to questions.

1. Answer the following Multiple Choice Questions. Print the correct choice on your drawing sheet:
(i) The dimension lines are drawn as?
(a) Small dash lines (b) Chain lines (c) Wavy lines (d) Thin continuous lines
(ii) The figure given below shows the conventional representation of which threads?

(a) External square threads (b) External V-threads (c) Internal square threads (d) Internal V-threads
(iii) Why Gib head is provided on a Gib head key?
(a) To facilitate the withdrawal of the key without disturbing the setting of the Hub.
(b) For lubrication purpose
(c) For the aesthetic sense
(d) To reduce the cost of manufacture
(iv) What is the purpose of an Open bearing?
(a) To join two pipes (b) To support the moving shaft (c) To join two shafts (d) To support the pipes
(v) Solid cast iron pulley is attached to the shaft by means of a _____.
(a) Rivet (b) Bolt (c) Key (d) Stud

2. (i) Construct an isometric scale.
(ii) A frustum of a triangular pyramid (base edge 40 mm, top edge 30 mm and height 60 mm) is kept with its axis perpendicular to H.P. One of the base edges is nearer to the observer and is parallel to V.P. Draw its isometric projection. Show the axis and indicate the direction of viewing. Give all dimensions.
(iii) A vertical hexagonal prism (base edge 20 mm, height 70 mm) is placed centrally on the top circular face of a hemisphere (Diameter 80 mm). Two base edges of the prism are perpendicular to V.P. The common axis is perpendicular to H.P. Draw the isometric projection of the combination of solids. Show the common axis and indicate the direction of viewing. Give all dimensions.

3. (i) Draw to scale 1: 1 the front view and top view of a Hook bolt of size M20, keeping the axis vertical. Give standard dimensions.

OR

Draw to scale 1: 1, the sectional front view of a Single riveted lap joint for joining the plates of thickness 16 mm. Give standard dimensions.

(ii) Keep the axis vertical, sketch freehand the front view of a Hexagonal socket head screw of size M10. Give standard dimensions.

OR

Keep the axis parallel to both H.P. and V.P. sketch freehand the front view and side view of a Plain stud of diameter 20 mm. Give standard dimensions.

4. Figure-1 shows the details of the parts of a Flanged Pipe Joint. Assemble these parts correctly and then draw to scale 1: 1 its following views:
(i) Front view lower half in section.
(ii) Side view looking from the right.
Print the title and the scale used. Draw the projection symbol. Give 6 important dimensions.

OR

Figure-2 shows the assembly of a sleeve and cotter joint. Disassemble the parts correctly and then draw its following views of the components to scale 1: 1, keep the same position of both sleeve and cotter-A with respect to both H.P. and V.P.
(i) Sleeve :

(a) Front view, upper half in section.

(b) Side view looking from left.

(ii) Cotter-A :

(a) Front view

(b) Top view

Print the title of both and the scale used. Draw the projection symbol. Give 6 important dimensions.

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Last Year Question Paper Class 12 Engineering Graphics 2017

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