CBSE Class 12 Engineering Graphics Question Paper 2011 CBSE,CCE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.
(i) Attempt all the questions.
(ii) Use both sides of the drawing sheet, if necessary.
(iii) All dimensions are in millimetres.
(iv) Missing and mismatching dimensions, if any, may be suitably assumed.
(v) Follow the SP : 46-1988 codes
(with First Angle method of projection).
(vi) In no view of Question 1 and in no sectioned view of question 3, are hidden
edges / lines required.
QUESTION PAPER CODE 68/1
1. (a) Construct an isometric scale, 110 mm long. 4
(b) Construct the isometric projection, to isometric scale, of a hemisphere (diameter = 70 mm), resting on H.P. with its circular face on it. The axis is parallel to V.P. Draw the axis, marking the centre of its circular base on H.P. Give dimensions. 7
(c) A pentagonal pyramid (base edge 30 mm and height 70 mm) is placed, centrally, on the top triangular face of a triangular prism (base side 90 mm and height 30 mm), with its pentagonal base on the prism. One base side of the pyramid, is parallel to V.P. and away from it. One side of the base of the prism, is parallel to V.P. and closer to the observer. Draw the isometric projection of the solids, placed together, to isometric scale. Draw their common vertical axis and indicate the direction of viewing. Give all dimensions.
2. (a) Draw to scale 1 : 1, the front view and top view of a Square Nut, for a nominal diameter d = 30 mm, keeping its axis perpendicular to H.P. and two sides of the square, parallel to V.P. Give all standard dimensions. 9
Draw to scale 1 : 1, the front view and top view of a Hook Bolt, taking nominal diameter = 26 mm and keeping its axis perpendicular to H.P. Give standard dimensions.
(b) Sketch freehand the front view and the top view of a Stud with Collar, keeping the axis perpendicular to H.P. Take nominal diameter = 25 mm. Give standard dimensions. 6
Sketch freehand the front view and the top view of a Pan Head Rivet (without tapered neck), keeping the axis vertical. Take diameter of the rivet as 25 mm. Give standard dimensions.
QUESTION PAPER CODE 68/1
EXPECTED ANSWERS/VALUE POINTS
Q 1 (a): ISOMETRIC SCALE 4
(i) Marking of divisions of 10 mm, 1 mm on true scale and marking angles of 30° & 45°. 1
(ii) Projections from scale 1:1 to get points on isometric scale, Printing ‘Scale 1:1’ and ‘Isometric Scale’. 1
(iii) Construction of isometric scale, 110 mm long, with main divisions of 10 mm each. 1
(iv) Division of the first part of isometric scale into 10 subdivisions. 1
Q 1 (b): ISOMETRIC PROJECTION OF A HEMISPHERE 7
(i) Drawing isometric ellipse on H.P. along with center lines. 3
(ii) Drawing semicircular portion of hemisphere. 2
(iii) Marking the center, vertical axis and diameter of hemisphere
For incorrect position of the hemisphere, like placing the curved surface of the hemisphere on H.P. instead of its flat circular base, 1½ marks should be deducted.
Q 1 (c): ISOMETRIC PROJECTION OF PENTAGONAL PYRAMID, PLACED CENTRALLY, ON AN EQUILATERAL TRIANGULAR PRISM 14 TRIANGULAR PRISM 7
(i) Drawing a helping figure of a triangle, base edge = 90 mm, with one base edge parallel to V.P. and closer to the observer. 1
(ii) Drawing isometric triangles. 3
(iii) Drawing face edges, parallel to the vertical axis / V.P. 2
(iv) Dimensioning edge of base of prism and its axis, i.e. height. 1
PENTAGONAL PYRAMID 7
(i) Helping figure (using either isometric scale or 1:1 scale) of a pentagon with one side parallel to V.P. and away from it. 1
(ii) Drawing isometric pentagon on the top triangular face of the triangular prism, centrally placed, with one side parallel to V.P. and away from it. 2
(iii) Drawing slant edges. 2
(iv) Marking the common vertical axis and direction of viewing. 1
(v) Printing dimensions.
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