Hi friends, today we are going to discuss you the latest Syllabus of Class XII Engineering Graphics Syllabus. As you know very well that Central Board of Secondary Education (CBSE) has its own curriculum and they hold the supreme authority to change it further for the benefit of students.
So it’s always a wise decision to keep an eye on what happening around with the subject you are going to learn. This year CBSE made little bit changes in Class XII Engineering Graphics Syllabus. Let us have a look at the updated CBSE Class XII Engineering Graphics Syllabus for the academic year 2017-18
CBSE Class XII Engineering Graphics Syllabus (2018-19 Session)
One Paper: 3 Hours 70 Marks
|Unit – I||Isometric Projections of Solids||25||50|
A. Drawing of Machine parts
Unit I: Isometric Projection of Solids (50 Periods)
(i) Construction of isometric scale showing main divisions of 10mm and smaller divisions of1mm, also showing the leading angles. Drawing helping view/s such as triangles, pentagon, hexagon, etc., using an isometric scale.
(ii) Isometric projection (drawn to isometric scale) of solids such as cube, regular prism and pyramids (triangular, square, pentagonal and hexagonal), cone, cylinder, sphere, hemisphere, frustum of right regular pyramids (triangular, square, pentagonal, hexagonal) and cone, when they are cut by a plane parallel to the base. The axis and the base side of the solid should be either perpendicular to HP / VP or parallel to HP and VP. (Indicate the direction of viewing)
(iii) Combination of two solids (except “frustum” of Pyramids and Cone) Keeping the base side parallel or perpendicular to HP/VP and placed centrally together, the axis of both the solids should not be given parallel to HP.
Note: (1) Question on frustum will be asked in the vertical position only.
(2) Hidden lines are not required in isometric projection.
Unit II: Machine Drawing (as per SP46: 2003) (118 Periods)
A. Drawing of machine parts (36 Periods)
(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, Hexagonal, Tee, and Hook); Nuts:
(Square and Hexagonal), Plain washer, a combination of nut and bolt with or without the washer for assembling two parts together, Single riveted lap joint with standard dimensions.
(ii) Free-hand sketches
(Internal choice will be given between any two of the following). Conventional representation of external and internal threads; studs (plain, square-neck, and collar); 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 and 600 countersunk flat head. Types of sunk-keys (rectangular taper, Woodruff and double-head feather key with gib head on both ends).
Note: In the above-mentioned machine parts (freehand sketches) “in-position” shall not be asked.
B. Assembly drawings and Dis-Assembly drawings (Internal choice will be given between an
Assembly drawing and a Dis-Assembly drawing).
Note: 1. In all Assembly drawings, the half-sectional front view will be asked. Side/End view or Top
View/Plan will be drawn without section.
2. In all the Dis-assembly drawings, only two orthographic views (one of the two views may be
half in section or full in section) of any two parts.
3. (a) In all sectional views, hidden lines/ edges are not to be shown.
(b) In all full views, hidden/edges are to be shown.
(ii) Bused- Bearing
(i) Cotter-joints for circular-rods (socket and spigot joint)
(ii) Cotter-joints for round-rods (sleeve and cotter joint)
(iii) Cotter-joints for square rods (Gib and cotter-joint)
3. Tie-rod and Pipe-joint
(ii) Flange pipe joint
(i) Unprotected Flange Coupling (having socket and spigot arrangement)
(ii) Protected Flange Coupling
(i) Solid cast iron pulley – (up to 200 mm diameters) having solid web
PRACTICALS (30 Marks 72 Periods)
One paper (Practical): 3 Hours
(i) To perform the following tasks from the given views of the prescribed Machine
1. Copy the given views 1
2. Drawing the missing view without 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. thermocol, soap-cake, plasticine, clay, wax, orchis (available with florists), etc. 7
(ii) Computer Aided Design (CAD) – Project 10
Project file to be submitted on the simple solids (Prism, Pyramids, and Frustums of equilateral triangle, square, pentagon and hexagon) or machine blocks as prescribed in part-I by using the CAD software.
(iii) (i) Sessional work relating to machine blocks as prescribed. 3
(ii) Viva-voce based on part-I and part-II 2