An arrowhead at the end of a dimension line is approximately _________ long and 1 mm wide.

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RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 1)
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  1. 3 mm
  2. 5 mm
  3. 1 mm
  4. 1.5 mm

Answer (Detailed Solution Below)

Option 1 : 3 mm
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Concept:

Dimension lines:

  • It should show distinct termination, in the form of arrowheads or oblique strokes or where applicable, an origin indication.
  • The size of the termination should be proportionate to the size of the drawing on which it is used. One style of termination only should be used on a single drawing.

Arrowhead:

  • An arrowhead is placed at each end of a dimension line.
  • Its pointed end touches an outline or extension line.
  • The size of an arrowhead should be proportional to the thickness of the outline.

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Explanation:

  • The standard ratio of length to the height of an arrow in dimensioning should be kept at only 3:1.
  • Even if there are so many types of arrows like oblique stroke, closed, open small open circle, etc.
  • Generally closed and the filled arrowhead is widely used and with 1:3 ratio.
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