ISC Class 12 Syllabus 2024 Geometrical and Mechanical Drawing

GEOMETRICAL AND MECHANICAL DRAWING (869)
This subject may not be taken with Geometrical and Building Drawing

Candidates will be required to reach a minimum edge. The use of drafting machines will be
standard in the subject as a whole. The use of permitted). A2 size paper will be used. The
drawing board, tee-square and set-square will be recommendation of IS:696-1972 Indian Standard,
required. (Candidates may, if they wish, use a Code of Practice for General Engineering Drawing
drawing board fitted with a parallel motion straight should be followed.

CLASS XI
There will be two papers in the subject: PAPER II (PROJECT WORK): 20 Marks
Paper I - Theory: 3 hours…… 80 Marks In addition to the syllabus prescribed above,
Paper II - Project Work ……. 20 Marks candidates are also required to be assessed in Project
Work. The Project work will be assessed by the
PAPER I (THEORY): 80 MARKS subject teacher.

SECTION A All candidates will be required to attempt either
Drawing A or Drawing B from each of the three
Plane Geometry project sheets given. Each drawing will carry
Construction and use of scales including diagonal 5 Marks.
scales. Enlargement and reduction of irregular plane Mark allocation for each Drawing (5 marks):
figures. Construction of triangles, quadrilaterals and
polygons. Similar plane figures. Problems on Criteria Marks
circles, tangents and normals. Loci such as the paths 1. Project size / completeness 1
of points in simple link mechanisms. Methods of
construction of ellipse, including its elementary 2. Line Quality 1
properties, parabola and rectangular hyperbola;
cycloidal and involute curves. 3. Neatness 1

SECTION B 4. Accuracy 1

Solid Geometry 5. Title Block 1
Orthographic projection. (Diagrams printed in the TOTAL 5
question papers may be in either First or Third Angle
projections; the projection used will be stated Marks out of 20 will be distributed as given
projections; the projection used will be stated. below:
Solutions in either First or Third Angle projections
will be accepted). Projection involving use of 1. 3 Drawings × 5 Marks 15 Marks
auxiliary planes; simple problems on auxiliary
projection. Simple problems on the intersection of 2. Viva-Voce by the subject 5 Marks
prisms, pyramids, cylinders, right circular cones, and teacher
spheres. Determination of true length of a line in TOTAL 20 Marks
space: sections and surface development of prisms,
pyramids, cylinders and right circular cones. Helix
treated as a locus with applications on the projection
of helices. Isometric and oblique projection without
the use of isometric scale.

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Instructions for Project Work:
• Candidates must use A2 size (Half Imperial) drawing sheets to complete all projects. A sample project
sheet layout with specifications, is given below:

• Candidates must use the given layout and specifications to complete each project sheet.
• Accuracy, neat and clean work is expected from candidates.
• Candidates need not draw / paste the questions.

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PROJECT SHEETS
Candidates will be required to attempt either Drawing A or Drawing B from each of the three project
sheets given below.
Project Sheet 1
Draw by using 1st OR 3rd angle method of projection i) F.V, ii) T.V. & iii) L.H.S.V

OR

280

Project Sheet 2
Copy the given template & insert any six dimensions.

OR

281

Project Sheet 3
Draw an isometric view of a given object.

OR

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CLASS XII

There will be two papers in the subject: PAPER II (PROJECT WORK): 20 Marks
Paper I - Theory: 3 hours…… 80 Marks In addition to the syllabus prescribed above,
Paper II - Project Work ……. 20 Marks candidates are also required to be assessed in Project
Work.
PAPER I (THEORY): 80 MARKS All candidates will be required to have completed
three project sheets, selecting at least one from
Drawing (Engineering) Section A (Orthographic Projections) and one from
Candidates will be required to answer all questions. Section B (Assembly Drawings). Each Project sheet
will carry 5 Marks.
The preparation of working drawings and assemblies
from dimensioned sketches based on the following: The Project work will be assessed by the subject
teacher and the Visiting Examiner appointed locally
(a) fastening (nuts, bolts, studs, keys, cotters, pins, and approved by the Council.
locking devices);
Mark allocation for each Project sheet (5
(b) rigid and flexible joints; marks)*:
(c) screw threads; their projection and the Criteria Marks
proportions of standard types, profiles and
proportions of spur gear teeth; conventional 1. Project size / completeness 1
methods of drawing gear wheels; 2. Line Quality 1
(d) transmission of motion and power, bearings, 3. Neatness 1
supports, shafts, coupling and clutches;
4. Accuracy 1
(e) pressure transmission in pipes using water, oil,
steam and gas, joints, unions, tees and bends, 5. Title Block 1
expansion joints, pressure packing; TOTAL 5
(f) constructional details of prime moves and simple
machine tools; Marks out of 20 will be distributed as given
(g) the use of reference points and planes in below:
dimensioning, machining and surface texture 1. 3 Project sheets × 5 Marks 15 Marks
symbols;
2. Viva-Voce (Visiting Examiner) 5 Marks
(h) toleranced dimensions involving the use of
IS:919 or B.S. 4500 Limits and Fits for TOTAL 20 Marks
Engineering.
Candidates will be expected to follow the
recommendations given in IS:696 - 1972 Indian
Standard, Code of Practice for General Engineering
Drawing. They should be familiar with both First
and Third Angle projections.

283

Instructions for Project Work:
• Candidates must use A2 size (Half Imperial) drawing sheets to complete all projects. A sample project
sheet layout with specifications, is given below:

• Candidates must use the given layout and specifications to complete each project sheet.
• Accuracy, neat and clean work is expected from candidates while completing the project sheets.
• Candidates need not draw / paste the questions.
• For assembly drawing, candidates need to draw:
(i) Full sectional F.V.
(ii) T.V. by using 1st OR 3rd angle method of projection (omitting all the hidden lines)

284

PROJECT SHEETS
Candidates are required to have completed three project sheets, selecting at least one from
Section A (Orthographic Projections) and one from Section B (Assembly Drawings).

SECTION A - ORTHOGRAPHIC PROJECTIONS
Project Sheet 1

Draw by using 1st OR 3rd angle method of projection i) F.V, ii) T.V. & iii) L.H.S.V

285

Project Sheet 2

Draw by using 1st OR 3rd angle method of projection i) F.V, ii) T.V. & iii) R.H.S.V

286

Project Sheet 3

Draw by using 1st OR 3rd angle method of projection i) F.V, ii) T.V. & iii) L.H.S.V

287

Project Sheet 4

Draw by using 1st OR 3rd angle method of projection i) F.V, ii) T.V. & iii) L.H.S.V

288

SECTION B - ASSEMBLY DRAWINGS
Project Sheet 1

Draw full sectional F.V & T.V of the following details of machine Parts. (omitting all hidden details)

289

Project Sheet 2
Draw full sectional F.V. & T.V. of the following details of machine Parts. (omitting all hidden details)

290

Project Sheet 3

Draw full sectional F.V & T.V of the following details of machine Parts. (omitting all hidden details)

291

Project Sheet 4
Draw full sectional F.V & T.V of the following details of machine Parts. (omitting all hidden details)

292

SAMPLE TABLE FOR PROJECT WORK
S. No. Unique Identification PROJECT SHEETS TOTAL MARKS
Number (Unique ID) of (Total 3 sheets of 5 marks each)
the candidate A B C D
Teacher Visiting Examiner Average Marks Viva-Voce by (C + D)
(A + B ÷ 2) Visiting
Examiner on
all three
project sheets
15 Marks 15 Marks 15 Marks 5 Marks 20 Marks
1

2

3

4

5

6

7

8

9

10

*For breakup of the 5 Marks (for each project sheet) to be awarded separately by the Teacher and the Visiting Examiner, please refer to the table
giving the criteria for mark allocation for each project.

NOTE: VIVA-VOCE of 5 Marks on the Project Sheets is to be conducted only by the Visiting Examiner and should be based on the Project Sheets only.

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