Engineering Graphics Class 12 Syllabus 2025

Theory paper is of 3 hours and 70 marks. The syllabus consists of two units: (I) Isometric Projections of Solids (II) Machine Drawing.

Engineering Graphics Class 12 Syllabus 2025

Exam Structure

# Unit Marks
I Isometric Projections of Solids 25 
II  Machine Drawing 45
A. Drawing of Machine parts  
B.  Assembly Drawing and Dis-assembly drawings  
1 Bearings  
2 Rod joints  
3 Tie-rod and pipe joints  
  Total 70

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

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

(Internal choice will be given between any two of the following).

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

  1. Open-Bearing
  2. Bush-Bearing

2. Rod-Joints

  1. Cotter-joints for round-rods (sleeve and cotter joint)
  2. Cotter-joints for square rods (Gib and cotter-joint)

3. Tie-rod and Pipe-joint

  1. Turnbuckle
  2. Flange pipe joint