Question

Explain by giving example that how can we choose a suitable scale.

Answer 1

Answer:

To draw engineering drawing or map on a small piece of paper, we need scale. By selecting appropriate scale we can accommodate all details of the object on a small piece of paper. It helps is studying a large area.

1 a)Engineering drawing

2 b) For Geographical maps & contours –

3 c) For Electrical Diagrams –

4 d) Graphs

5 e) Flow charts -

6 Intext Questions

Scale is selected by the maximum length available for drawing on the paper divided by maximum actual length to be plotted. For example if 25cm size drawing paper is available for drawing and we want to draw engineering drawing of sketch given in the fig.10-1 Maximum dimension to be plot is 300 meter on the drawing paper. Therefore, you can select scale as — Scale = length available on the paper / Maximum length of the object to be draw: = 25 cm / 300 m = 1 cm / 12 m Therefore, scale will be 1 cm = 12 m Please remember all dimensions on the plot has to be reduced to this scale. For make it simple, try to select the scale in integers. i.e. 1, 2, 3 … As far as possible do not select a scale in fractions 1.2, 1.4, 4.5 etc.

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