This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Different Types of Lines – 1”.
1. Medium thickness, line-group of 2mm are not used for _________
a) out lines
b) dotted lines
c) cutting plane -lines
d) dimension lines
Explanation: Out lines, dotted lines and cutting plane-lines are drawn using 2mm thickness lines. Whereas centre lines, section lines, dimension lines, extension lines, construction lines, leader lines, short break lines and long-break lines are drawn using 1mm thickness lines.
2. Initial work and construction lines are drawn using __ pencil.
Explanation: Initial work and construction lines are drawn using H pencil. 2H pencil is used for outlines, dotted lines, dimension lines and arrowheads. 3H, 4H are used for centre lines and section lines.
3. Centre lines, section lines are drawn using __ pencil.
c) 3H or 4H
Explanation: Centre lines, section lines are drawn using 3H or 4H pencil. Outlines, dotted lines, section-plane lines, dimension lines and arrow heads are drawn using 2H. These different pencils give different shades which give different importance to lines in drawing.
Explanation: Lines used to represent cutting planes is chain thin (narrow) with thick (wide) at the ends and at changing of position, lines used to represent centroidal lines and outlines of adjacent parts are chain thin double-dashed or long-dashed double-dotted (narrow).
Explanation: Hidden outlines, hidden edges are drawn using dashed thin (narrow) lines. Dimension lines are drawn using continuous thin (narrow) lines (straight or curved). The given type of line in question is used to represent cutting planes.
Explanation: The other lines are continuous thin (narrow) (straight or curved) which areused for grid, dimension. Dashed thin (narrow) is used for hidden outlines. A Chain thin long-dashed dotted (narrow) line is used for centre line, lines of symmetry etc.
Explanation: Thick-thin-thick are used for cutting planes, dashed thick (wide) is used for surface treatment, zigzag lines are used for long-break lines and continuous thin line is used for dimensions, extensions and projection lines.
Explanation: Thick-thin-thick are used for cutting planes, dashed thick (wide) is used for surface treatment, chain thick or long dashed dotted (wide) is used for indication of lines or surfaces to which a special requirement applies and continuous thin line is used for dimensions, extensions and projection lines.
9. Drawing pencils are graded according to increase in relative __________
Explanation: Drawing pencils are graded according to the increase in relative hardness. They are marketed with the labeled as H, 2H, 3H, 4H, 5H, 6H etc. These grades are used for getting accurate, clean and neat drawings.
10. Match the following.
|1.||Dimension lines||i.Continuous thick lines|
|2.||Extension or Projection lines||ii.Continuous thin lines|
|3.||Margin lines||iii.Continuous thick lines|
|4.||Outlines||iv.Continuous thin lines|
a) 1, i; 2, ii; 3, iii; 4, iv
b) 1, ii; 2, iii; 3, iv; 4, i
c) 1, ii; 2, iv; 3, iii; 4, i
d) 1, iv; 2, iii; 3, ii; 4, i
Explanation: Dimension lines are continuous thin lines, are terminated at the outer ends by pointed arrowheads. Extension lines continuous thin lines extend by about 3mm beyond the dimension lines. Margin lines are continuous thick or wide lines along which the prints are trimmed. Outlines are continuous thick or wide lines.
11. Short-break lines are drawn freehand while long-break lines are ruled lines.
Explanation: Short-break lines are continuous, thin and wavy. They are drawn with freehand and are used to show a short-break or irregular boundaries. Long-break lines are thin ruled lines with short zigzags within them.
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