ISC Class 12 Syllabus 2022 Geometrical and Mechanical Drawing

GEOMETRICAL AND MECHANICAL DRAWING (869) This subject may not be taken with Geometrical drawing board fitted with a parallel motion straight and Building Drawing. edge. The use of drafting machines will be permitted). A2 size paper will be used. The recommendation of Candidates will be required to reach a minimum IS:696-1972 Indian Standard, Code of Practice for standard in the subject as a whole. The use of General Engineering Drawing should be followed. drawing board, tee-square and set-square will be required. (Candidates may, if they wish, use a CLASS XI There will be one paper of 3 hours duration of SECTION B 100 marks. Solid Geometry Orthographic projection. (Diagrams printed in the SECTION A question papers may be in either First or Third Angle projections; the projection used will be stated. Plane Geometry Solutions in either First or Third Angle projections Construction and use of scales including diagonal will be accepted). Projection involving use of auxiliary planes; simple problems on auxiliary scales. Enlargement and reduction of irregular plane projection. Simple problems on the intersection of figures. Construction of triangles, quadrilaterals and prisms, pyramids, cylinders, right circular cones, and polygons. Similar plane figures. Problems on circles, spheres. Determination of true length of a line in tangents and normals. Loci such as the paths of points space: sections and surface development of prisms, in simple link mechanisms. Methods of construction pyramids, cylinders and right circular cones. Helix of ellipse, including its elementary properties, treated as a locus with applications on the projection parabola and rectangular hyperbola; cycloidal and of helices. Isometric and oblique projection without involute curves. the use of isometric scale. CLASS XII There will be one paper of 3 hours duration of 100 (e) pressure transmission in pipes using water, oil, marks. steam and gas, joints, unions, tees and bends, Drawing (Engineering) expansion joints, pressure packing; Candidates will be required to answer all questions. (f) constructional details of prime moves and simple The preparation of working drawings and assemblies machine tools; from dimensioned sketches based on the following: (g) the use of reference points and planes in (a) fastening (nuts, bolts, studs, keys, cotters, pins, dimensioning, machining and surface texture locking devices); symbols; (b) rigid and flexible joints; (h) toleranced dimensions involving the use of IS:919 or B.S. 4500 Limits and Fits for Engineering. (c) screw threads; their projection and the proportions of standard types, profiles and proportions of spur gear teeth; conventional methods of drawing gear Candidates will be expected to follow the wheels; recommendations given in IS:696 - 1972 Indian Standard, Code of Practice for General Engineering (d) transmission of motion and power, bearings, Drawing. They should be familiar with both First and supports, shafts, coupling and clutches; Third Angle projections. 260