GEOMETRICAL AD MECHAICAL DRAWIG (869)

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