CBSE Class 12 Engineering Graphics Syllabus 2026-27

ENGINEERING GRAPHICS Subject Code – 046 Class XII (2026-27)

Study of engineering graphics is defined as the set of graphic communication techniques used to convey the ideas, designs, concepts and information using proper standards. Since ages, professionals like Architects, Draftsmen, Surveyors, and even technocrats have been extensively using concepts and ideas of Engineering Graphics. The subject of 'Engineering Graphics' is an indispensable tool for all the branches of Engineering. This is necessary for the design, construction or analysis of machines, structures, and various systems even digitally. This subject is also useful for various designers like prototype designer, product designer, tool & die designer, apparel designer, footwear designer and interior designer. It is expected that the knowledge gained through the study of different topics and the skills acquired through the prescribed practical work will make the learners to meet the challenges of academic, professional courses and practical applications like design and development of vehicles, industrial products, aircrafts, dental implant fixtures, surgical planning of knee replacement etc. after studying the subject 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 different objects.

Reinforcing the related mathematical concepts.

Develop a clear understanding of plane geometry, solid geometry, and machine drawing to apply the same in relevant practical fields such as technology and industry.

Develop analytical, visual, and spatial skills.

Develop the skill of expressing two-dimensional and three-dimensional objects into professional language and vice versa.

• Acquire speed and accuracy in use of drawing instruments.

Acquire the ability to readily draw neat sketches, often needed in "On-job situations".

• Use digital technology (CAD) in designing and developing isometric and orthographic projections of simple objects.

COURSE STRUCTURE

CLASS XII (2026-27)

One Paper (Theory): 3 Hours

70 Marks

30 Marks

One paper (Practical): 3 Hours

1. No. Unit Name Marks

Isometric Projections of Solids 25

Ш Machine Drawing 45

1. Drawing of Machine parts
2. Assembly Drawing and Dis-assembly drawings
3. Bearings
4. Rod joints
5. Tie-rod and Pipe joint

Practical 30

Total Marks 100

THEORY

Unit I: Isometric Projection of Solids

1. Construction of isometric scale showing main divisions of 10mm and smaller divisions of 1 mm, also showing the leading angles. Drawing helping view/s such as triangles, pentagon, hexagon, etc., using isometric scale.

1. Isometric projection (drawn to isometric scale) of right regular solids such as cubes; prisms and pyramids (triangular, square, pentagonal and hexagonal); cone; cylinder; sphere; hemi-sphere; when they are kept with their axis (a) perpendicular to HP/VP (b) parallel to HP and VP both.

1. 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)

A. Drawing of machine parts

1. 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 head, hexagonal head; Nuts – Square head, Hexagonal head; Plain washer, Combination of nut and bolt with or without washer for assembling two parts together;

1. Free-hand sketches

Conventional representation of external and internal threads; Types of studs - Plain stud, Square-neck stud, Collar stud; Screws (round- head, cheese- head, 90° flat counter sunk-head, hexagonal socket head and grub-screw); Types of rivets - Snap head, Pan head

(without tapered neck), Flat head, 60° countersunk flat head.

B. Assembly drawings and Dis-Assembly drawings

(Internal choice will be given between an Assembly drawing and a Dis- Assembly drawing).

1. Bearings
2. Open-Bearing
3. Bush- Bearing
4. Rod-Joints
5. Cotter-joints for round-rods (Sleeve and cotter joint)
6. Cotter-joints for square rods (Gib and cotter-joint)
7. Tie-rod and Pipe-joint
8. Turnbuckle
9. Flange pipe joint

Note:

1. In all Assembly drawings, half sectional front view will be asked. Side/End view or Top View/Plan will be drawn without section.
2. 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.

1. (a) In all sectional views, hidden lines/edges are not to be shown.
2. In all full views, hidden lines/edges are to be shown.

PRACTICALS

1. To perform the following tasks (for One only) from the given views

of the prescribed fifteen (15) machine blocks in ANNEXURE-I.

Value-Points

1. Copy the given views 1
2. Drawing the missing view with hidden lines 2
3. Sketching the Isometric view without hidden edges 5

1. proportionately drawn with Any medium i.e., Soap-cake, plasticine, clay, wax, floral foam

brick (available with florists), etc. 7

1. Computer Aided Design (CAD) – Project 10 Project file to be submitted on the simple solids or machine blocks as prescribed in part-I by using the CollabCAD software or any equivalent pertinent software.

(iii)

Total Marks 30

ACTIVITY

Industrial Visits (Two) to any industry/manufacturing plant/higher educational institute to acquaint the students with the present - day methods & technology for better conceptual understanding.