Edudel Syllabus Class 12 Engineering Graphics

COURSE STRUCTURE
ENGINEERING GRAPHICS (Code 046)
CLASS XII (2023-24)

THEORY
Unit I: Isometric Projection of Solids

(i) 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.

(ii) 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.

(iii) 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
(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 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
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, 60 0
countersunk flat head.

Mid Term syllabus to be completed by 15 September 2023
MID TERM EXAMINATION

B. Assembly drawings and Dis-Assembly drawings
(Internal choice will be given between an Assembly drawing and a Dis-Assembly
drawing).
1. Bearings
(i) Open-Bearing
(ii) Bush- Bearing
2. Rod-Joints
(i) Cotter-joints for round-rods (Sleeve and cotter joint)
(ii) Cotter-joints for square rods (Gib and cotter-joint)
3. Tie-rod and Pipe-joint
(i) Turnbuckle
(ii) Flange pipe joint
Note:
3. In all Assembly drawings, half sectional front view will be asked. Side/End view or
Top View/Plan will be drawn without section.
4. 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.
5. (a) In all sectional views, hidden lines/ edges are not to be shown.
(b) In all full views, hidden lines/edges are to be shown.

NOTE: • Whole syllabus will be covered in Common Pre-Board Examination.

Annual syllabus to be completed by 15/12/23

PRACTICALS
(i) 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
4. To make the machine block of the above in three dimensions.
(Not to scale but approximately proportionately drawn with
Any medium i.e., Soap-cake, plasticine, clay, wax, floral foam brick
(available with florists), etc. 7

(ii) 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) (a) Sessional work relating to machine blocks as 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.