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What is the height if the dimension figures written on the dimension line?

(a) 7mm to 9mm

(b) 2mm to 3mm

(c) 6mm to 8mm

(d) 3mm to 5mm

The question was asked in an online interview.

My query is from System of Dimensioning in chapter Lines, Lettering and Dimensioning of Engineering Drawing

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Correct option is (d) 3mm to 5mm

The explanation: It is customary to write the figures with a height of 3mm to 5mm. This helps in the readability of the dimension figures. It also makes reading the dimensions easy. The thickness of the letters is so adjusted that it can read without effort.

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