CBSE (Commerce) Class 12CBSE

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Engineering Graphics Class 12 CBSE (Commerce) CBSE Topics and Syllabus

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Topics with syllabus and resources

100.00 Isometric Projection of Solids
  1. Construction ofisometric scale showing main divisions of 10mm and smaller divisions of1mm, also showing theleading angles. Drawing helping view/s such as triangles, pentagon, hexagon, etc.,usingisometric scale.
  2. Isometric projections (drawn toisometric scale) of sol ds such as cube, regular prism and pyramids (triangular, square, pentagonal and hexagonal), cone, cylinder, sphere, hemi· sphere, 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 I VP or parallel to HP and VP. (Indicate the direction of viewing)
  3. Combinat on of two solids (except "frustum" of Pyramids and Cone) 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.
200.00 Machine Drawing
201.00 Drawing of Machine Parts
  1. Drawing to fullsize 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, combination of nut and bolt with or without washer for assembling two parts together, Single rivetedlap joint with standard dimensions.
  2. Free-hand sketches
    (Internal choice will be given between any two of the following).
    Conventional representat on of external and internal threads; studs (plain, square-neck and collar); 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 and 60° countersunkflat head. Types of sunk-keys (rectangular taper, woodruff and double-head feather keywith gib head on bothends).
202.00 Assembly Drawings and Dis-assembly Drawings
  • In all Assembly drawings, half sectional front view will be asked. Side/End view or Top View/Plan will be drawn without section.
  • 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.
  • (a) In all sectnonal views, hidden lines I edges are not to be shown.
    (b) In all full views, hidden /edges are to be shown.
  1. Bearings
    (i) Open-Bearing
    (i) Bushed-Bearing
  2. Rod-Joints
    (i) Cotter-joints for circular-rods (socket and spigot joint) (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
    ( i) Flange pipe joint
  4. Couplings
    (i) Unprotected Flange Coupling (having socket and spigot arrangement) (i) Protected Flange Coupling
  5. Pulleys
    (i) Solidcast iron pulley - (upto 200 mm diameters) having solidweb

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