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What is the length of the short dashes of the centre lines?

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What is the length of the short dashes of the centre lines?

(a) 5mm

(b) 2mm

(c) 1mm

(d) 3mm

I got this question in homework.

I'm obligated to ask this question of Different Types of Lines topic in chapter Lines, Lettering and Dimensioning of Engineering Drawing

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Right option is (b) 2mm

The best I can explain: Centre line consists of a long dash of 8-10mm, a gap of 1mm, short dash of 2mm and then a gap of 1mm. This pattern continues throughout the centre line. In the case of section line, the ends of the section line are thickened. This is how section line and centre line are different.

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