# CBSE Class-11 Syllabus 2018-19 (Engineering Graphics)

## CBSE Class-11 Syllabus 2018-19 (Engineering Graphics)

The subject of 'Engineering Graphics' has become an indispensable tool for Engineers, Technocrats, Architects, Draftsmen, Surveyors, Designers and many other professionals in the recent times. Understanding of its fundamental principles and wider applications of the same in the above fields and many other daily life situations form the basis for the syllabus at Senior Secondary Stage.

## Objectives:

• The studyofthesubjectofEngineeringGraphicsatSeniorSchoolLevelaimsathelpingthe learnerto:
• develop clear concept and perception of form, proportion andapplication.
• develop the skill of expressing three-dimensional and two-dimensional objects into professional language and vice versa.
• acquire the ability to readily draw neat sketches, often needed in "On-job situations".
• developaclearunderstanding ofplaneandsolidGeometryandmachinedrawing soas toapply the same in relevant practical fields such as technology andindustry.
• acquire speed and accuracy in use of drawinginstruments.
• use technology (CAD) in developing isometric and orthographic projections of simple objects.

## Cource Structure :

 SR.No Unit No.of Period Marks I PLANE GEOMETRY 1. Lines, angles and rectilinearfigures 2. Circles andtangents 3. Special curves :ellipse,parabola,involute, cycloid,helixandsinecurve 16 38 II SOLID-GEOMETRY 4. Orthographic-projections of points and line. 5. Orthographic projection of regular plane figures. 6. Orthographic projections of right regular solids. 7. Section of solid-figures 27 86 III MACHINE DRAWING 8. Orthographic projections of simple machine-blocks 9. Isometric-projection of laminae (plane figures) 10. Development of surfaces 27 50 Practicals 30 30 Total 100 240

## Theory

PLANE GEOMETRY
Printing English alphabets (capital and small) numerals in standard proportions.Unidirectional/aligned system of dimensioning as per SP: 46-2003 (Revised)

Unit 1: Construction of lines, angles and their divisions. Simple questions based on triangles, square, rhombus, trapeziums, regular polygons-pentagon, hexagon and octagon.

Unit 2: Construction of circles, external and internal tangents of circles, inscribing, circumscribing circles in equilateral triangle, square, rhombus, regular polygons-pentagon, hexagon and octagon.

Unit3: ConstructionofEngineeringcurves:
(a) Ellipse by concentric circles, intersecting arcs and intersecting lines.
(b) Parabola by intersecting lines and intersecting arcs.
(c) Involuteofacircle,cycloid,helixandsinecurve.

SOLID GEOMETRY

Unit 4: Methods of orthographic projections and dimensioning strictly as per SP: 46- 2003 revised conventions. Projectionofpoints,lines.

Unit 5: Orthographic projections of Regular Plane figures - triangle, square, pentagon, hexagon, circle and semi-circle.

Unit 6: Orthographic projections of right regular solids such as cubes, prisms and pyramid,(square, triangular, pentagonal and hexagonal), cones, cylinders, spheres, hemispheres and frustum of pyramids and cone when they are kept with their axis (a) perpendicular, to HP/VP (b) parallel to one plane and inclined to the other (c) parallel to HPandVP both.

Unit 7: Section of solids under the same conditions mentioned above made by the horizontal, vertical and inclinedplanes.

MACHINE DRAWING

Unit 6: Orthographic projections of simple machine blocks.

Unit 7: Construction of isometric scale showing main divisions of 10 mm and smaller divisions of 1 mm each. Isometric projection (drawn to isometric scale) of figures such as triangles, squares, pentagons, hexagons, circles and
semi-circles with their surface parallel to HP or VP and its one side or diagonal or diameter should be either parallel or perpendicular to HP/VP.

Unit 8: Development of the surfaces of following solids: