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What is the standard length and width of the arrowhead of dimension lines?

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What is the standard length and width of the arrowhead of dimension lines?

(a) 2mm and 2mm

(b) 3mm and 1mm

(c) 4mm and 2mm

(d) 3mm and 2mm

This question was addressed to me during an online exam.

I'd like to ask this question from Different Types of Lines in division Lines, Lettering and Dimensioning of Engineering Drawing

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Right choice is (b) 3mm and 1mm

To elaborate: Arrowheads of dimension lines have a length of 3mm and 1mm wide. When drawing the arrowheads the ratio, length: width is to be maintained at 3:1. The arrowheads can be drawn with length 6mm and breadth 2mm, since the ratio is the same.

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