ISC Class 12 Syllabus 2023 Geometrical and Mechanical Drawing (Revised)

GEOMETRICAL AND MECHANICAL DRAWING (869)
Note: The Syllabus for this Subject has not been changed.
This subject may not be taken with Geometrical drawing board fitted with a parallel motion straight
and Building Drawing. edge. The use of drafting machines will be
permitted). A2 size paper will be used. The
Candidates will be required to reach a minimum
recommendation of IS:696-1972 Indian Standard,
standard in the subject as a whole. The use of
Code of Practice for General Engineering Drawing
drawing board, tee-square and set-square will be
should be followed.
required. (Candidates may, if they wish, use a

CLASS XII

There will be two papers in the subject:
Paper I - Theory: 3 hours…… 80 Marks Paper II - Project Work ……. 20 Marks

PAPER I (THEORY): 80 MARKS

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

1

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)

2

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

3

Project Sheet 2

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

4

Project Sheet 3

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

5

Project Sheet 4

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

6

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)

7

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

8

Project Sheet 3

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

9

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

10

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.

11