CBSE Board Exam 2020 for 12th Engineering Graphics subjects is scheduled on 29th February 2020. Check CBSE 12th Engineering Graphics Syllabus along with other important resources. These resources are very important for the preparation of CBSE 12th Engineering Graphics Board Exam 2020.
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CBSE Class 12 Engineering Graphics Syllabus for 2020 Board Exam
One Paper (Theory): 3 Hours - 70 Marks
One paper (Practical): 3 Hours - 30 Marks
| S.No. |
Unit Name |
Marks |
| I |
Isometric Projections of Solids |
25 |
| II |
Machine Drawing
A. Drawing of Machine parts
B. Assembly Drawing and Dis-assembly drawings
1. Bearings
2. Rod joints
3. Tie-rod and pipe joints
4. Couplings
5. Pulleys |
45 |
|
|
Practical |
30 |
|
|
Total Marks |
100 |
Unit I: Isometric Projection of Solids
(i) Construction of isometric scale showing main divisions of 10mm and smaller divisions of 1mm, also showing the leading angles. Drawing helping view/s such as triangles, pentagon, hexagon, etc., using isometric scale.
(ii) Isometric projection (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 and the base side of the solid should be either perpendicular to HP / VP or parallel to HP and VP. (Indicate the direction of viewing).
(iii) Combination of two solids (except "frustum" of Pyramids and Cone) Keeping the base side parallel or perpendicular to HP/VP and placed centrally together, axis of both the solids should not be given parallel to HP.
Note: (1) Question on frustum will be asked in vertical position only.
(2) Hidden lines are not required in isometric projection.
Unit II: Machine Drawing (as per SP 46: 2003)
Drawing of machine parts
(i) Drawing to full size scale with instruments.
(Internal choice will be given between any two of the following).
Introduction of threads: Standard profiles of screw threads - Square, Knuckle, B.S.W., Metric (external and internal); 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
(Internal choice will be given between any two of the following).
Conventional representation of external and internal threads; studs (plain, square-neck and collar); screws (round-head, cheese-head, 900 flat counter sunk-head, hexagonal socket head and grub-screw); Types of rivets:- snap head, pan head-without tapered neck, flat head and 600 countersunk flat head. Types of sunk-keys (rectangular taper, woodruff and double-head feather key with gib head on both ends).
Note: In the above mentioned machine parts (free hand sketches) “in-position” shall not be asked.
Assembly drawings and Dis-Assembly drawings (Internal choice will be given between an Assembly drawing and a Dis-Assembly drawing).
Note:
In all Assembly drawings, half sectional front view will be asked. Side/End view or Top View/Plan will be drawn without section.
In all the Dis-assembly drawings, only two orthographic views (one of the two views may be half in section or full in section) of any two parts.
(a) In all sectional views, hidden lines/ edges are not to be shown.
(b) In all full views, hidden/edges are to be shown.
earings
(i) Open-Bearing
(ii) Bush- Bearing
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)
Tie-rod and Pipe-joint
(i) Turnbuckle
(ii) Flange pipe joint
Couplings (socket and spigot arrangement)
(i) Unprotected Flange Coupling
(ii) Protected Flange Coupling
Pulleys
(i) Solid cast iron pulley – (up to 200 mm dia) having solid web
PRACTICALS
(i) To perform the following tasks from the given views of the prescribed machine block (One).
Value-Points
Copy the given views 1
Drawing the missing view without hidden lines 2
3.Sketching the Isometric view without hidden edges 5
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 florists), etc. 7
(ii) Computer Aided Design (CAD) – Project 10
Project file to be submitted on the simple solids (Prism, Pyramids and Frustums of equilateral triangle, square, pentagon and hexagon) or machine blocks as prescribed in part-I by using the CAD software.
(iii) (i) Sessional work relating to machine blocks as prescribed. 3
(ii) Viva-voce based on part-I and part-II 2 Total Marks: 30
ACTIVITY
Industrial Visit (Two) to any industry/ manufacturing & plant to acquaint the students with the presents with the present day methods & technology for better conceptual understanding.
For complete details download the PDF of the syllabus
Download CBSE Class 12 Engineering Graphics Syllabus for 2020 Board Exam