CBSE Class 12 Engineering Graphics Syllabus 2024-25
COURSE STRUCTURE
One Paper (Theory): 3 Hours 70 Marks
One paper (Practical): 3 Hours 30 Marks
S. No. |
Unit Name |
Marks |
Periods |
I |
Isometric Projections of Solids |
25 |
60 |
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 joint |
45 |
114 |
Practical |
30 |
66 |
|
Total Marks |
100 |
240 |
THEORY
Unit I: Isometric Projection of Solids – 60 Periods
- Construction of isometric scale showing main divisions of 10mm and smaller divisions of 1mm, also showing the leading Drawing helping view/s such as triangles, pentagon, hexagon, etc., using isometric scale.
- Isometric projection (drawn to isometric scale) of solids such as cube; regular prisms and pyramids (triangular, square, pentagonal and hexagonal); cone; cylinder; sphere; hemisphere. 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).
- Combination of any two above mentioned solids 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. Hidden lines are not required in isometric projection.
2. Indicate the direction of viewing.
Unit II: Machine Drawing (as per SP46: 2003) – 114 Periods
Drawing of machine parts 30 Periods
-
- Drawing to full size scale with instruments. 25 Periods (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 head, Hexagonal head; Nuts – Square head, Hexagonal head; Plain washer; combination of nut and bolt with or without washer for assembling two parts together.
-
- (ii) Free-hand sketches 10 Periods
Conventional representation of external and internal threads; Types of studs– Plain stud, Square-neck stud, Collar stud; 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, 600 countersunk flat head.
- Assembly drawings and Dis-Assembly drawings
(Internal choice will be given between an Assembly drawing and a Dis-Assembly drawing). 74 periods
- Bearings
- Open-Bearing
- Bush- Bearing
- Rod-Joints
- Cotter-joints for round-rods (Sleeve and cotter joint)
- Cotter-joints for square rods (Gib and cotter-joint)
- Tie-rod and Pipe-joint
- Turnbuckle
- Flange pipe joint
Note:
- In all Assembly drawings, half sectional front view will be Side/End view or Top View/Plan will be drawn without section.
- In all Dis-assembly drawings, only two orthographic views (one of the two views may be half in section or full in section) will be asked of any two parts only.
- (a) In all sectional views, hidden lines/ edges are not to be
(b) In all full views, hidden/edges are to be shown.
PRACTICALS – 66 Periods
- To perform the following tasks (for One only) from the given views of the prescribed ten machine blocks in ANNEXURE-I.
Value-Points
- Copy the given views 1
- Drawing the missing view with hidden lines 2
- Sketching the Isometric view without hidden edges 5
- To make the machine block of the above in three (Not to scale but approximately proportionately drawn with 7
Any medium i.e. thermocol, soap-cake, plasticine, clay, wax, orchsis (available with florists), etc.
- 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.
- (a) Sessional work relating to machine blocks a prescribed. 3
- (b) Viva-voce based on part-I and part-II 2
Total Marks: 30
ACTIVITY
Industrial Visits (Two) to any industry/ manufacturing plant to acquaint the students with the present – day methods & technology for better conceptual understanding can be done by virtual tour of the factory/plant. The following links are given as an example for same:
Bolt Making Machine Manufacturer
https://www.youtube.com/watch?v=ARS87trb4u4
Machine Tools Manufacturing Process -2
https://www.youtube.com/watch?v=vlZjTEkGbN8
BMW Engine Factory
https://www.youtube.com/watch?v=0z6E_1KonbA
Hydro electric Virtual Plant Tour
https://youtu.be/Ki8kSB1ThJQ
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