# (Syllabus) CBSE Class 11th & 12th : Engineering Graphics Syllabus 2011 (Code No: 046)

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## Courses of Studies 2011 Class : 11th & 12th Engineering Graphics (Code No 046)

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.

## (Theory) One Paper 3 Hours 70 Marks

PLANE GEOMETRY
1. Lines, angles and rectilnear figures 4 Marks
2. Circles, semi-circles and tangents 6 Marks
3. Special curves : ellipse, parabola, involute, cycloid. helix and sine-curve 6 Marks

SOLID-GEOMETRY
4. Orthographic-projections of points, lines laminae, (plane) and solids 12 Marks
5. Section of solid-figures 15 Marks

MACHINE DRAWING
6. Orthographic projections of simple machine-blocks 12 Marks
7. Isometric-projection of laminae (plane) figures 10 Marks
8. Development of surfaces 5 Marks

PLANE GEOMETRY
Unit 1: Construction of lines, angles and their divisions. Simple questions based on triangles, square, rhombus, trapeziums, regular polygons-pentagon, hexagon and octagon. 0 8 Pds.
Unit 2: Construction of circles, external and internal tangents of circles, inscribing of circles in equilateral triangle, square, rhombus, regular polygons-pentagon, hexagon and octagon. 10Pds.
Unit 3: (a) Special curves : Construction of ellipses by the following methods:
(i) Concentric circles
(ii) Intersecting arcs
(iii) Intersecting lines
(b) Parabola by the following methods:
(i) Intersecting lines
(ii) Intersecting arcs
(c) Involute of a circle.
(d) Cycloid, helix and sine curve 20 Pds.

SOLID GEOMETRY
Unit 4: Methods of orthographic projections and dimensioning strictly as per SP: 46- 1988 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 5Pds.
Unit 8: Development of the surfaces of following solids:
1. Cube, cuboid, prisms–triangular, square, pentagonal and hexagonal.
2. Pyramids (triangular, square, pentagonal and hexagonal).
3. Right-circular-cylinder and cone 10 Pds.

## Practicals : One paper (Practical) 3 hours 30 Marks

1. Developing "Prisms" & "Pyramids" with the help of card board (thick paper).

2. Developing different types of packing boxes (cartons).

3. Making different types of graphics designs/murals for interior/exterior decorations using coloured laminae using the knowledge of circumscribing, inscribing and describing of plane geometrical figures.

4. Drawing ellipse by
(a)Trammel method
On ground or drawing-sheets/ply-wood.

5. Preparing top-view (plan) of a
(a)Class-room
(b)Hoom : Drawing rooms/Bedrooms/Studyroom/Kitchen
(c) Engineering Graphic Rooms
Showing different objects in it

6. Drawing through activities:
(a) Involutes
(b) Cycloid
(c) Helix
(d) Sine-curves and listing their uses in daily life.

7. 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:
(i) parallel to the base
(ii) perpendicular to the base
(iii) inclined to the base
Also creating different objects with combination of above solids.

Note :
I. In all the practicals drawing/sketching of the views should be incorporated and evaluated accordingly.

II. The scheme of evaluation is as follows:
(a) Practicals(2) 15 Marks
(b) Drawing/Sketch 05 Marks
(c) Viva-voce 05 Marks
(d) Sessional Work 05 Marks

## CLASS XII (Theory) One Paper 3 Hours 70 Marks

I. Isometric projections of solids 25 Marks
II. Machine Drawing
A. Drawing of Machine parts 15 Marks
B. Sectional view of assembly of machine parts: 30 Marks
1. Bearings
2. Rod joints
3. Tie-rod and pipe joints
4. Couplings
5. Pulleys

Unit I: Isometric projection of solids 50 Pds.
Construction of isometric scale showing main divisions of 10mm and smaler divisions of 1mm, also showing the leading angles. Helping view/s such as triangles, pentagon, hexagon etc. can be drawn using scale 1:1 or isometric scale. Hidden lines are not required in isometric projection.
Isometric projections (drawn to isometric scale) of solids such as cube, regular prism and pyramids (triangular, square, pentagonal and hexagonal), cone, cylinder, sphere, hemi-sphere, frustum of right regular pyramids (triangular, square, pentagonal, hexagonal) and cone, when they are cut by a plane parallel to the base. The axis of the solid should be either perpendicular to H.P. / VP or parallel to HP and VP both. (Indicate the direction of viewing)
Combination of two solids (except "frustum" of Pyramids and Cone) Keeping the base side parallel or perpendicular to H.P./V.P. and placed centrally together, but in no case the common axis of both the solids should be given parallel to H.P.
Note: Question on single solid will be asked in vertical position only.

Unit II: Machine Drawing
A. Drawing of machine parts 36 Pds.
(i) Drawing to full size scale with instruments. 9 marks
(Internal choice will be given between ony two of the following).
nomenclature of threads: Standard profiles of screw threads (square, knuckle, B.S.W. Metric (external and internal) and bolts (square, Hexagonal, Tee and Hook); Nuts: (square and hexagonal), Plain washer, combination of nut and bolt with or without washer for assembling two parts together, single riveted lap joint with standard dimensions.
(ii) Free-hand sketches 6 marks
(Internal choice will be given between any two of the following.

B. Students are required to attempt either Assembly drawings (All) or Dis-assembly drawings (asterix marked only) of the following Machine parts. 82 Pds.
Note:
1. In all the Assembly drawings, only half sectional front view will be asked and the other half without section. Side/End view or Top View/Plan will be drawn without section, wherever applicable.
2. In all the Dis-assembly drawings (asterix marked only), only two orthographic views (one of the two views may be half in section or full in section) of any two parts.
3. (a) In all sectional views, hidden lines / edges are not to be shown.
(b) In all full views, hidden /edges are to be shown.
1. Bearings
* (i) Open-Bearing
* (ii) Bushed-Bearing
* (iii) Footstep-Bearing (only sectional front-view will be asked)
* (iv)Simple Plummer-Block (only sectional front view will be asked with only round brasses).
2. Rod-Joints
* (i) Cotter-joints for circular-rods (socket and spigot joint)
* (ii) Cotter-joints for round-rods (sleeve and cotter joint)
* (iii) Cotter-joints for square rods (Gib and cotter-joint)
* (iv)Knuckle-joints (only sectional front view will be asked)

3. Tie-rod and Pipe-joint
(i) Turnbuckle
(ii) Flange pipe joint
4. Couplings
(i) Unprotected Flange Coupling (having socket and spigot arrangement)
(ii) Protected Flange Coupling
5. Pulleys
(i) Solid cast Iron Pulley (upto 200 mm diameter) having solid web
(ii) Single groove V-belt pulley (upto 200 mm diameter)

## Practical’s

One paper (Practical) 3 Hours 30 Marks, 72 Pds.

(I) To perform the following jobs from the given views of the prescribed Machine Block (One).

Value-Points
1. Copy the given views   -    1
2. Drawing the missing view with hidden lines   -    2
3. Sketching the Isometric view vithout hidden edges   -    5
4. To make the machine block of the above in three dimensions. (not to scale but approximately proportionately) drawn with any medium i.e. thermocol, soap-cake, plasticine, clay, wax, orchsis ( available with flowerists) etc.  -    7

(II) "Comuter aided design" CAD – Project -   10
Project file to be submitted on the simple solids (Prism, Pyramids and frustums of equilateral triangle, square, pentagon and hexgon) or machine blocks as prescribed in part-I by using the "computer aided design" CAD software.

(III) (i) Sessional work relating to machine blocks as prescribed. -   3
(ii) Viva-voice based on part-I and part-II  -   2

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