# CBSE-2017 Syllabus for Engineering Graphics Classes XI

The subject of ‘Engineering Graphics’ has become an indispensable tool for Engineers, Technocrats, Architects, Draftsmen, Surveyors, Designers and many others 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 study of the subject of Engineering Graphics at Senior School Level aims at helping the learner to:

- develop clear concept and perception of form, proportion and purpose.
- 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”
- develop a clear understanding of plane and solid Geometry and machine drawing so as to apply the same in relevant practical fields such as technology and industry.
- acquire speed and accuracy in use of drawing instruments.
- Using technology (CAD) in developing isometric and othographics projections of simple objects.

## COURSE STRUCTURE of Class XI (Theory) One Paper 3 Hours and 70 Marks

Unit | Marks |

PLANE GEOMETRY-Lines, angles and rectilnear figures PLANE GEOMETRY-Circles and tangents PLANE GEOMETRY-Special curves: Ellipse, parabola, involute, cycloid. Helix and sine-curve | 5 Marks |

SOLID-GEOMETRY-Orthographic-projections of points, lines laminae (plane), and solids | 15 Marks |

SOLID-GEOMETRY-Section of solid-figures | 12 Marks |

MACHINE DRAWING-Orthographic projections of simple machine-blocks | 16 Marks |

MACHINE DRAWING-Isometric-projection of laminae (plane) figures | 10 Marks |

MACHINE DRAWING-Development of surfaces | 4 Marks |

Total Marks | 70 Marks |

## Plane Geometry

Printing English alphabets (capital & 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. 08 Pds.

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. 10Pds.

Unit 3: Construction of Engineering curves:

- Ellipses by concentric circles, intersecting arcs and intersecting lines.
- Parabola by intersecting lines and intersecting arcs
- Involute of a circle, cycloid, helix and sine curve. 20 Pds.

## Solid Geometry

Unit 4: Methods of orthographic projections and dimensioning strictly as per SP: 46 − 2003 revised conventions. Projection of points, lines, regular plane figure and right regular solids such as cubes, prisms and pyramids (square, triangular, pentagonal and hexagonal), cones, cylinders, spheres, hemi-spheres 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 HP and VP both. 40 Pds.

Unit 5: Section of solids under the same conditions mentioned above made by the horizontal, vertical and inclined planes, also showing true-shape of section. 45 Pds.

## Machine Drawing

Unit 6: Orthographic projections of simple machine blocks. 40 Pds.

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 toHP/VP. 15 Pds.

Unit 8: Development of the surfaces of following solids:

- Cube, cuboid, prisms-triangular, square, pentagonal and hexagonal.
- Pyramids (triangular, square, pentagonal and hexagonal).
- Right circular cylinder and cone 10 Pds.

## Practicals

### One paper (Practical) is 3 hours and 30 Marks and 72 Pds

- Developing “Prisms” & “Pyramids” with the help of card board (thick paper).
- Developing different types of packing boxes (cartons).
- Making different types of graphic designs/murals for interior/exterior decorations in colour using the knowledge of geometrical figures with the use of any Computer Software such as Collab-CAD, CORAL DRAW, PHOTOSHOP etc.
- Drawing ellipse by Trammel and Thread method on the ground/drawing sheet/ply wood/card board etc.
- Preparing top-view (plan) of a class room, Home: Drawing room/Bedroom/Study room/Kitchen, Engineering Graphics room drawing different objects therein.
- Drawing through activities: Involutes, cycloid, helix and sine curves listing their uses in daily life.
- Preparing the following sections of solids (prisms, pyramids, sphere etc.) with clay, soap, thermocol, plasticine, wax or any other material easily and economically available. When the cutting plane is: Parallel to the base, perpendicular to the base and inclined to the base.

Also creating diffent objects with combination of above solids.

Note:

- In all the practicals drawing/sketching of the views should be incorporated and evaluated accordingly.
- The scheme of evaluation is as follows:

- Practicals (2) in 15 Marks
- Drawing/Sketch in 05 Marks
- Viva-voce in 05 Marks
- Sessional Work in 05 Marks
- Total 30 Marks.