Projection line is
A. Continuous thick line
B. Continuous thin line
C. Chain thin line
D. Dashed line
Please scroll down to see the correct answer and solution guide.
Right Answer is: B
SOLUTION
Types of lines
There are mainly four types of lines are present in engineering drawing:
Visible line: Represent features that can be seen in the current view.
Dimension line: It is also known as extension line or leader line and it indicates the sizes and location of features
Hidden line: Represent features that cannot be seen in the current view.
Centre line: Represents symmetry, path of motion, centres of circles, axis of symmetrical parts.
|
No. |
Line description and representation |
Application |
|
1. |
Continuous narrow line
|
1. Imaginary lines of intersection 2. Dimension lines 3. Extension lines 4. Construction Line 5. Leader lines and reference lines 6. Hatching 7. Outlines of revolved sections 8. Dimension line terminations 9. Diagonals for the indication of flat surfaces 10. Projection lines 11. Grid lines |
|
|
Continues freehand line
|
11. Preferably manually represented the termination of partial or interrupted views, cuts 8. sections, if the limit is not a line of symmetry or a centre line- |
|
|
Continues narrow line with zigzags
|
12. Preferably mechanically represented the termination of partial or interrupted views, cuts and sections, if the limit is not a line of symmetry or a centre line. |
|
2. |
Continues wide line
|
1. Visible edge 2. Visible outlines 3. Crests of screw threads 4. Main representation in diagrams, maps, flow chats 5. Systems lines (structural metal engineering) |
|
3. |
Dashed narrow line
|
1. Hidden edges 2. Hidden outlines |
|
4. |
Dashed wide line
|
1. An indication of permissible areas of surface treatment |
|
5. |
Long-dashed dotted narrow line
|
1. Centre lines 2. Lines of symmetry 3. Pitch circle of gears 4. Pitch circle of holes |
|
6. |
Long-dashed dotted wide line
|
1. An indication of (limited) required areas of surface treatment, e.g. heat treatment 2. indication of cutting planes |
