Practical Drawing, Measurement, and Project Work
What this domain tests
This domain tests site measurement, scale drawing, grid overlay, and project presentation. You must be able to measure a plot, convert units, draw a north line, and calculate areas accurately.
Core rules and concepts
- Tools: measuring tape, compass, graph paper, scale ruler, and drawing software. Always mark the north line and the scale on the sheet.
- Units: 1 ft = 0.3048 m; 1 m = 3.28084 ft; 1 sq m = 10.7639 sq ft; 1 gaz = 3 ft; 1 acre = 43,560 sq ft; 1 hectare = 10,000 sq m. Local bigha varies, so confirm the revenue standard before converting.
- Drawing conventions: show plot boundaries, setbacks, wall thickness, door and window symbols, room labels, and the Vastu grid overlay. Check squareness by measuring both diagonals.
- Project work should include site data, orientation, zone map, dosha list, remedies, and area statement.
Worked example
A plot is 30 ft by 40 ft, with setbacks of 5 ft at the front and 3 ft on the sides and rear. The plot area is 1,200 sq ft. The built-up rectangle is 24 ft by 34 ft, or 816 sq ft. At a scale of 1:100, 30 ft becomes about 9.14 cm and 40 ft about 12.19 cm on the drawing. The reasoning is that setbacks reduce both dimensions, and the scale converts real feet to drawing centimetres.
Traps that cost marks
Do not measure with a phone compass near steel. Do not omit the north arrow or scale. Do not mix feet and metres in one calculation. Do not measure only internal dimensions when the plot boundary is required. Do not assume a bigha is the same in every state.