# CBSE-2022 Syllabus for Engineering Graphics Classes XII

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## Theory of Class XII 3 Hours and 70 Marks

 Unit Marks Isometric projections of solids, Machine Drawing, Drawing of Machine parts 15 Marks Assembly Drawings and Dis-assembly drawings 30 Marks BearingsRod jointsTie-rod and pipe jointsCouplingsPulleys 25 Marks Totals 70 Marks

### Unit I: Isometric Projection of Solids 50 Pds

1. Construction of isometric scale showing main divisions of 10mm and smaller divisions of 1mm, also showing the leading angles. Drawing helping view/s such as triangles, pentagon, hexagon etc using isometric scale.
2. Isometric projections (drawn to isometric scale) of solids 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 H. P. /VP or parallel to HP and VP (Indicate the direction of viewing) . Combination of two solids (except “frustum” of Pyramids and Cone) Keeping the base side parallel or perpendicular to H. P. /V. P. And placed centrally together, axis of both the solids should not be given parallel to H. P.

Note:

1. Question on frustum will be asked in vertical position only.
2. Hidden lines are not required in isometric projection.

### Unit II: Machine Drawing (As Per SP 46: 2003)

Drawing of machine parts 36 Pds.

1. Drawing to full size scale with instruments. 9 marks (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 riveted lap joint with standard dimensions.
2. Free-hand sketches-6 marks

Internal choice will be given between any two of the following:

Assembly drawings and Dis-Assembly drawings-82 Pds.

Internal choice will be given between: Assembly drawing and a Dis-Assembly drawing.

Note:

1. In all Assembly drawings, 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 (asterix ⚹ marked only) , only two orthographic views (one of the two views may be half in section or full in section) of any two parts.
• In all sectional views, hidden lines/edges are not to be shown.
• In all full views, hidden/edges are to be shown.

### Bearings

1. Open-Bearing
2. Bushed-Bearing
3. Footstep-Bearing (only sectional front-view will be asked)
4. Simple Plummer-Block (only sectional front view will be asked with only round brasses) .

### Rod-Joints

1. Cotter-joints for circular-rods (socket and spigot joint)
2. Cotter-joints for round-rods (sleeve and cotter joint)
3. Cotter-joints for square rods (Gib and cotter-joint)
4. Knuckle-joints (only sectional front view will be asked)

### Tie-Rod and Pipe-Joint

1. Turnbuckle
2. Flange pipe joint

### Couplings

1. Unprotected Flange Coupling (having socket and spigot arrangement)
2. Protected Flange Coupling

### Pulleys

1. Solid cast Iron Pulley (upto 200 mm diameter) having solid web
2. Single groove V-belt pulley (upto 200 mm diameter)

## Practicals Pf 3 Hours and 30 Marks and 72 Pds

### Value-Points

1. Copy the given views-1 Marks
2. Drawing the missing view with hidden lines-2 Marks
3. Sketching the Isometric view vithout hidden edges-5 Marks
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, orchsis (available with flowerists) etc. 7